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GTX 950 ACX2.0 SSC Power Question

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neondev
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Wednesday, December 16, 2015 10:14 PM (permalink)
Hello everyone,
 
I just recently purchased new evga gtx 950 acx2.0 ssc card, and I foolishly forgot to count the number of pins on the external power connector of the card. The card requires one 8 pin pcie power connector, and my psu only has one 6 pin power connector available. Since the card came with a 2 x 6 pin to 8 pin connector, would one 6 pin power the card correctly, or should I look into purchasing a 4 pin molex to 6 pin pcie so that both 6 pin inputs are used? (I have an extra 4 pin molex I can use on my psu, I would just need the adapter)
 
Thanks for any help!  
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    Erik
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    Re: GTX 950 ACX2.0 SSC Power Question Wednesday, December 16, 2015 10:26 PM (permalink)
    Hello Neondev
     
    You'll want to use 2 of those 6 pin connectors if using the adapter.  If you've only got one available, I'd advise against using a second adapter.  Double check your 6 pin again, there are variants with an additional 2 pin connector off to the side that would let you power an 8 pin in conjunction with the 6 pin.
     
    If that's not the case, I'd recommend updating the power supply to one that has a 6+2 for PCIe.  Safety first. 
    #2
    neondev
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    Re: GTX 950 ACX2.0 SSC Power Question Wednesday, December 16, 2015 10:58 PM (permalink)
    Thank you for the quick reply! Unfortunately, I'm using an Hp z210 workstation, and the power supply is not replaceable. Would a 6 to 8 pin adapter work? Thanks again for your help. 
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    bob16314
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    Re: GTX 950 ACX2.0 SSC Power Question Wednesday, December 16, 2015 11:06 PM (permalink)
    It might run okay with just a 6-pin instead of an 8-pin..A 6-pin will fit and electrically work in an 8-pin socket, it is backward compatible..My 760 SC takes a 6-pin + an 8-pin but I ve run it for about a week before using two 6-pin just for kicks to see if it made any diff, and it didn't, at all, not even overclocked, gaming or stress testing.
     
    An 8-pin has a 150W spec (link)..A 6-pin has a 75W spec..The PCIe x16 slot itself has a 75W spec..Your card (details) is only a 125W card..So a 6-pin + the PCIe slot would be 150W, which is more than the 125W card spec..Ideally, you'd want it connected the it's supposed to be like Erik said above, but in a pinch it'll most likely work fine.

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    lastsamurairick
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    Re: GTX 950 ACX2.0 SSC Power Question Wednesday, December 16, 2015 11:43 PM (permalink)
    Make sure u that if u decided to use a Molex adapter to 8 Pin PCI-E will actually work. I have old Molex to PCI-E & crazy thing is 8 pin will not fit any newer GPU's. I look at it & compared to my PSU 8 Pin they are different.

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    EVGA_James
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    Re: GTX 950 ACX2.0 SSC Power Question Thursday, December 17, 2015 0:06 PM (permalink)
    If you need a dual 4pin molex connector to 6pin connector as well, please register your product and contact our support team direct at 888-881-3842 so that we can send one out to you. 


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    neondev
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    Re: GTX 950 ACX2.0 SSC Power Question Thursday, December 17, 2015 0:53 PM (permalink)
    Thanks everyone for the replies. I tried just plugging the 6 pin into the 8 pin, and the only thing that appeared on the screen was, "Please power down and plug in the pcie power". I am probably going to purchase a couple of adapters off of amazon, and hopefully one of those will work. Thanks again for everyone's quick replies.
    #7
    stalinx20
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    Re: GTX 950 ACX2.0 SSC Power Question Thursday, December 24, 2015 12:50 AM (permalink)
    EVGATech_Erik
    Hello Neondev
     
    You'll want to use 2 of those 6 pin connectors if using the adapter.  If you've only got one available, I'd advise against using a second adapter.  Double check your 6 pin again, there are variants with an additional 2 pin connector off to the side that would let you power an 8 pin in conjunction with the 6 pin.
     
    If that's not the case, I'd recommend updating the power supply to one that has a 6+2 for PCIe.  Safety first. 


    Hello Erik, I have some questions regarding your response that does have similar questions to this thread....
    Is it safe to use a 6+2 PCIE connector (*SINGLE* connection on that PCIE line, not two connections) while using a PCIE "adaptor" on the 2nd input PCIE connection, rather than using both pcie connections, to help with the voltage? I'm hearing mixed stories that it's not really recommended to use a single PCIE line,  using both connections on a single line. Do you understand my question? Can you help on this? Or does anyone else have some other input?
     
    My situation I have is that my EVGA psu fried (again), so I bought a backup psu, but this psu does not have 4 PCIE lines, only has 2.
     
    Or would it make no difference at all? Right now I have both PCIE lines powering both my 980's, and they're both using both connections on both lines. I can say, right now I don't see any voltage issues whatsoever, or see any declining in performance.
    Thanks in advance.
     
    post edited by stalinx20 - Thursday, December 24, 2015 12:59 AM

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    #8
    neondev
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 3:19 PM (permalink)
    Hello everyone! Just wanted to say that I finally got it working! I bought a 6 pin to 8 pin pcie adapter off of amazon, plugged it in, and now the card is working wonderfully! I downloaded the dying light demo (to stress the card) and it was amazing! Very glad that I made this purchase, and thanks again for everyone's help earlier!
    #9
    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 5:10 PM (permalink)
    neondev
    Hello everyone! Just wanted to say that I finally got it working! I bought a 6 pin to 8 pin pcie adapter off of amazon, plugged it in, and now the card is working wonderfully! I downloaded the dying light demo (to stress the card) and it was amazing! Very glad that I made this purchase, and thanks again for everyone's help earlier!



    You do know that a 6-pin to 8-pin adapter is not ATX certified and not recommended, right?  Please, do not overclock your video card and please do not blame EVGA if your motherboard or power supply breaks at some point in the future.
    #10
    bsmegreg
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 5:37 PM (permalink)
    You might be safe, but there's a good chance something will break. I'm going to deffinitly suggest you buy a diffrient PSU. You should be able to get one on sale for under $50 with an 8-pin cable. Look at Corsairs PSU's for the best results. Newegg is generally selling them pretty cheap.

    #11
    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 5:56 PM (permalink)
    Using a 6-pin to 8-pin adapter is fine. http://www.jonnyguru.com/.../showthread.php?t=7212
    #12
    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:10 PM (permalink)
    Sajin
    Using a 6-pin to 8-pin adapter is fine. http://www.jonnyguru.com/.../showthread.php?t=7212

    It is not fine.  The card was designed to have an 8-pin connector for a reason.  EVGA doesn't just decide randomly to spend more money to have an 8-pin connector soldered to their board during manufacturing for no reason.  He is losing 25% 33% from his overhead straight off the bat.  That cuts massively into the safety factor.
     

    Though, a PCIe 8pin connector has the same number of 12v wires (3) and just 2 more ground wires than a PCIe 6pin connector. So right there, theoretically, a 6pin could provide 150w

    That statement is completely false.
     
    6-pin has:
    2 12v power
    2 ground
    1 connector sense (6-pin sense)
     
    8-pin has:
    3 12v power
    3 ground
    2 connector sense (6-pin and 8-pin sense)
     
     
    In conclusion, 8-pin has 1 extra power, 1 extra ground, and 1 extra ground sense feedback.
    post edited by ty_ger07 - Friday, December 25, 2015 7:06 PM
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    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:13 PM (permalink)
    If it wasn't a good idea to use 6-pin to 8-pin adapters why do they even exist? 
    #14
    bsmegreg
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:20 PM (permalink)
    Technically the 6-pin can carry 150W, but it's not exactly safe. Sure, it works for the time being, but one day you might be halfway into a game and BANG the PC shuts off. You can only hope it's just the PSU that needs replaced. But sometimes you're not that lucky.

    I'm fine with his decision as long as he knows the risks.

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    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:22 PM (permalink)
    ty_ger07
    Sajin
    Using a 6-pin to 8-pin adapter is fine. http://www.jonnyguru.com/.../showthread.php?t=7212

    It is not fine.  The card was designed to have an 8-pin connector for a reason.  EVGA doesn't just decide randomly to spend more money to have an 8-pin connector soldered to their board during manufacturing for no reason.  He is losing 25% from his overhead straight off the bat.  That cuts massively into the safety factor.
     

    Though, a PCIe 8pin connector has the same number of 12v wires (3) and just 2 more ground wires than a PCIe 6pin connector. So right there, theoretically, a 6pin could provide 150w

    That statement is completely false.
     
    6-pin has:
    2 12v power
    2 ground
    1 ground sense
     
    8-pin has:
    3 12v power
    3 ground
    2 ground sense
     
     
    In conclusion, 8-pin has 1 extra power, 1 extra ground, and 1 extra ground sense feedback.


    Your info is wrong. http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress a 6-pin has three just like a 8-pin.
    #16
    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:22 PM (permalink)
    Sajin
    If it wasn't a good idea to use 6-pin to 8-pin adapters why do they even exist? 

    They exist for people on a budget to try to make their computer work (for an undetermined period of time before something breaks).  Just because they exist doesn't mean you should use them.
     
    I will ask you the same question.  If it isn't a good idea, why do POWMAX Assassin power supplies exist.
     
    That was a serious question and a joke all-in-one, by the way.  (feel free to read the reviews )
     
     
    The general rule of power supplies is this:  if the power supply doesn't have the connectors you need, the power supply isn't up to the task at hand.  Specific connectors are used for a reason.  They are implemented to prevent users from using hardware in the way it was not designed to be used.
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    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:26 PM (permalink)
    ty_ger07
    Sajin
    If it wasn't a good idea to use 6-pin to 8-pin adapters why do they even exist? 

    They exist for people on a budget to try to make their computer work (for an undetermined period of time before something breaks).  Just because they exist doesn't mean you should use them.
     
    I will ask you the same question.  If it isn't a good idea, why do POWMAX Assassin power supplies exist.
     
    That was a serious question and a joke all-in-one, by the way.  (feel free to read the reviews )
     
     
    The general rule of power supplies is this:  if the power supply doesn't have the connectors you need, the power supply isn't up to the task at hand.  Specific connectors are used for a reason.  They are implemented to prevent users from using hardware in the way it was not designed to be used.


    Guess i'll just sue the company when it breaks my rig. 
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    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:26 PM (permalink)
    Sajin
    ty_ger07
    Sajin
    Using a 6-pin to 8-pin adapter is fine. http://www.jonnyguru.com/.../showthread.php?t=7212

    It is not fine.  The card was designed to have an 8-pin connector for a reason.  EVGA doesn't just decide randomly to spend more money to have an 8-pin connector soldered to their board during manufacturing for no reason.  He is losing 33% from his overhead straight off the bat.  That cuts massively into the safety factor.
     

    Though, a PCIe 8pin connector has the same number of 12v wires (3) and just 2 more ground wires than a PCIe 6pin connector. So right there, theoretically, a 6pin could provide 150w

    That statement is completely false.
     
    6-pin has:
    2 12v power
    2 ground
    1 connector sense (6-pin sense)
     
    8-pin has:
    3 12v power
    3 ground
    2 connector sense (6-pin and 8-pin sense)
     
     
    In conclusion, 8-pin has 1 extra power, 1 extra ground, and 1 extra ground sense feedback.


    Your info is wrong. http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress a 6-pin has three just like a 8-pin.




    No, my info is not wrong.  Check the PCI-SIG specifications.  The middle "power wire" of a 6-pin connector is not designed to be connected and is optional.  It should NEVER be assumed that it will be connected to any voltage source.
     
    https://en.wikipedia.org/wiki/PCI_Express#Power
     
    Some power supply manufacturers don't include that wire.  Some power supply manufacturers include the wire but don't connect it to anything on the inside of the power supply.  Some power supply manufacturers include the wire but connect it to a feedback loop -- so that the power supply voltage regulator knows what the voltage output is after voltage drop down the wires -- and therefore it is not a source of current.  Some power supply manufacturers include it and connect it to 12v source (but who knows which source or rail distribution).  NEVER assume that the wire is a source of current!  It will vary from power supply to power supply and you would have to dissect each one for each specific case to make a determination of whether or not it is safe.
     
    What I said is 100% true without making any additional assumptions.
     
    6-pin has:
    2 12v power
    2 ground
    1 connector sense (6-pin sense)
     
    8-pin has:
    3 12v power
    3 ground
    2 connector sense (6-pin and 8-pin sense)
    post edited by ty_ger07 - Friday, December 25, 2015 7:06 PM
    #19
    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:28 PM (permalink)
    ty_ger07
    Sajin
    ty_ger07
    Sajin
    Using a 6-pin to 8-pin adapter is fine. http://www.jonnyguru.com/.../showthread.php?t=7212

    It is not fine.  The card was designed to have an 8-pin connector for a reason.  EVGA doesn't just decide randomly to spend more money to have an 8-pin connector soldered to their board during manufacturing for no reason.  He is losing 25% from his overhead straight off the bat.  That cuts massively into the safety factor.
     

    Though, a PCIe 8pin connector has the same number of 12v wires (3) and just 2 more ground wires than a PCIe 6pin connector. So right there, theoretically, a 6pin could provide 150w

    That statement is completely false.
     
    6-pin has:
    2 12v power
    2 ground
    1 ground sense
     
    8-pin has:
    3 12v power
    3 ground
    2 ground sense
     
     
    In conclusion, 8-pin has 1 extra power, 1 extra ground, and 1 extra ground sense feedback.


    Your info is wrong. http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress a 6-pin has three just like a 8-pin.




    No, my info is not wrong.  Check the PCI-SIG specifications.  The middle power wire is not designed to be connected and is optional.  It should NEVER be assumed that it will be connected to any voltage source.  Some power supply manufacturers don't include it.  Some power supply manufacturers include it but don't connect it to anything.  Some power supply manufacturers include it but connect it to a feedback loop so that the power supply voltage regulator knows what the power output is after voltage drop down the wire.  Some power supply manufacturers include it and connect it to 12v source.  NEVER assume!


    In the first link I gave you a corsair rep said it's not a issue. 
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    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:33 PM (permalink)
    Sajin
     
    In the first link I gave you a corsair rep said it's not a issue. 



    He is obviously making massive assumtions and is very stupid to make such a statement in his position.
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    bsmegreg
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:47 PM (permalink)
    I looked into it some more and it looks like the PCI lane should supply 75W of power and the card is only 90W, so the cable should only be supplying 15W without OC. Even with the OC this is way below the 75W that a 6-pin should be using. In fact I don't think you even need a 8-pin cable. Some cards are fine if you just plug in a 6-pin cable into the 8-pin slot. Sometimes this prevents OC'ing or even prevents the card from working. It wouldn't hurt to try. I would suggest trying to just plug the 6-pin into the card as that would be safer. The 6 to 8 pin connector is probably just an unnescasary risk.

    Overall, I don't see a big issue with it.

    #22
    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:48 PM (permalink)
    Another good thread for reading... http://www.overclock.net/...-pin-to-8-pin-adapters
    #23
    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 6:49 PM (permalink)
    bsmegreg
    I looked into it some more and it looks like the PCI lane should supply 75W of power and the card is only 90W, so the cable should only be supplying 15W without OC. Even with the OC this is way below the 75W that a 6-pin should be using. In fact I don't think you even need a 8-pin cable. Some cards are fine if you just plug in a 6-pin cable into the 8-pin slot. Sometimes this prevents OC'ing or even prevents the card from working. It wouldn't hurt to try. I would suggest trying to just plug the 6-pin into the card as that would be safer. The 6 to 8 pin connector is probably just an unnescasary risk.

    Overall, I don't see a big issue with it.


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    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 7:00 PM (permalink)
    bsmegreg
    I would suggest trying to just plug the 6-pin into the card as that would be safer. The 6 to 8 pin connector is probably just an unnescasary risk.

    From earlier in the thread:
    neondev
    Thanks everyone for the replies. I tried just plugging the 6 pin into the 8 pin, and the only thing that appeared on the screen was, "Please power down and plug in the pcie power". I am probably going to purchase a couple of adapters off of amazon, and hopefully one of those will work. Thanks again for everyone's quick replies.

     
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    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 7:10 PM (permalink)
    bsmegreg
    I looked into it some more and it looks like the PCI lane should supply 75W of power and the card is only 90W, so the cable should only be supplying 15W without OC.



    Peak power consumption of this particular card is 122W at stock settings.
     
    https://www.techpowerup.c...GA/GTX_950_SSC/28.html
     

    The Furmark maximum power consumption result reveal that EVGA increased their card's power limit, which makes sense since the card uses an 8-pin instead of a 6-pin PCIe connection for power input. This provides some extra performance potential for NVIDIA Boost.

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    bsmegreg
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 7:17 PM (permalink)
    ty_ger07
    bsmegreg
    I looked into it some more and it looks like the PCI lane should supply 75W of power and the card is only 90W, so the cable should only be supplying 15W without OC.



    Peak power consumption of this particular card is 122W at stock settings.
     
    https://www.techpowerup.c...GA/GTX_950_SSC/28.html
     

    The Furmark maximum power consumption result reveal that EVGA increased their card's power limit, which makes sense since the card uses an 8-pin instead of a 6-pin PCIe connection for power input. This provides some extra performance potential for NVIDIA Boost.



    75W PCI Lane + 75W 6-pin = 150W

    150W > 122W

    Even with OC I don't see how it's going to pass 150W. No, it's not ideal or use a 6 to 8 pin adaptor, but it probably will not harm anything.

    #27
    neondev
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 7:45 PM (permalink)
    Wow, I did not expect the thread to explode like this! I have absolutely no intention of overclocking this card, so no worries there. Unfortunately, the psu can not be upgraded, but I checked the specs, and it is rated for 400 watts (with 90% efficiency).
     
    One last question, if the maximum wattage of this card is 122 watts, and the 75w pcie lane + 75w 6 pin (with 8 pin adapter) is way above 122w, and the tdp of the cpu is only 80w, is there any reason why the psu would be abnormally stressed and subject to potential failure? (sorry for noob-ish questions, I am somewhat new to computer building). Thanks again for all of the replies.   
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    Sajin
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 7:59 PM (permalink)
    neondev
    Wow, I did not expect the thread to explode like this! I have absolutely no intention of overclocking this card, so no worries there. Unfortunately, the psu can not be upgraded, but I checked the specs, and it is rated for 400 watts (with 90% efficiency).
     
    One last question, if the maximum wattage of this card is 122 watts, and the 75w pcie lane + 75w 6 pin (with 8 pin adapter) is way above 122w, and the tdp of the cpu is only 80w, is there any reason why the psu would be abnormally stressed and subject to potential failure? (sorry for noob-ish questions, I am somewhat new to computer building). Thanks again for all of the replies.   


    Your psu will be fine. The pci-e slot (lane) can provide up to 75w if needed, the 8-pin can provide up to 150w if needed. Under maximum stress the card is only using 122w of the available 225w. 
    #29
    ty_ger07
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    Re: GTX 950 ACX2.0 SSC Power Question Friday, December 25, 2015 8:48 PM (permalink)
    As long as you remain within your computer's specified operating limitations, you should be fine.



    V12-G is your graphics card 6-pin connector.

    EVGA, could you please fix your mobile site's usability issues? Adding that image was entirely too difficult via phone. (every popup is broken and redirects to forum root which makes advanced editor impossible to use)
    post edited by ty_ger07 - Friday, December 25, 2015 11:44 PM
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