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Needing 3x8pin on G2 650W

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doreyu
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2020/11/21 10:26:22 (permalink)
I have a G2 650W power supply that came with 2x (6+2) + 6 pin cables, and only 2 PCIe/VGA connections.
 
I was just able to order a RTX 3080 card that has 3x8 pin power connectors. So I am short of one 8 pin connector.
 
This seems like a good power supply and many people are running 3080s on 650W. Is there a way to get a new 8+8 cable, or is my only option upgrading to a 750W?
 
Thanks
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    Dabadger84
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    Re: Needing 3x8pin on G2 650W 2020/11/21 12:00:32 (permalink)
    Under no circumstances should you be running a 3080 on a 650W PSU, especially one with insufficient VGA/PCIe cables.  I haven't seen anyone here running a 3080 on less than 750W unless their system is completely stock and even then, that's below the recommended minimum, which means you're risking your warranty.
     
    Minimum recommended PSU for the 3080 is 750W, I recommend at least 850W+ because quite a few people on these forums have had issues with several different 750W PSU models not being adequate (shut downs, blue screens etc that were fixed with a PSU upgrade).
     
    I would highly recommend against even trying to run the 3080 on your current PSU, it could damage the card (or the PSU and thereby your system) if you try to rig it up so it works by using adapters.
     
    Personally if I were you I'd get at least a 1000W unit, so that you have plenty of headroom & zero chance of having any power issues.  If you're in the US, check Amazon for eVGA, Corsair or Silverstone PSUs, they have them on sale pretty regularly there, and make sure you're buying NEW not RENEWED if you're getting it off Amazon.  You can also buy from eVGA direct https://www.evga.com/products/product.aspx?pn=210-GQ-1000-V1 and use an associates code for a discount of 5-10%
     
     

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    #2
    bob16314
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    Re: Needing 3x8pin on G2 650W 2020/11/21 12:05:16 (permalink)
    Minimum recommended PSU is a 750W for RTX 3080 cards with 3x 8-pin connectors like an FTW3 and FTW3 Ultra.
     
    There's adapters you can buy to convert other connectors to 8-pin PCIe connectors such as Dual 4-pin to 8-pin and Dual SATA to 8-pin, but I wouldn't..Get a PSU with the proper connectors.
     
    Use the OuterVision Power Supply Calculator to estimate your system's total wattage need.

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    #3
    doreyu
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    Re: Needing 3x8pin on G2 650W 2020/11/21 12:43:50 (permalink)
    750W recommendation seems like an over-estimation and I've seen examples of 3090s being ran on 650W.
     
    But regardless I don't see an option to purchase a 8+8 cable from EVGA, so my plan would be to buy a 750 G3 or G5, one with compatible cables.
    #4
    gabolton
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    Re: Needing 3x8pin on G2 650W 2020/11/21 13:53:49 (permalink)
    Last night I checked out my power draw. It ranged from 698-713W.
     
    My 10850k has a relatively mild OC on it and the 3080 FTW3 Ultra is running straight out of the box. No memory or GPU overclocks on it at all. At idle, as I type this, my system is drawing 279W, CPU temp is 32C, GPU temp is 57C with a peak of 73C running Port Royal.
     
    In no way, shape or form would I try to run this on anything less than an 850W PSU on 3 separate PCIE cables. Doing anything else is just begging for trouble if you have any sort of OC on your CPU, think you might want to OC your GPU or have a lot of fans/drives in your system.

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    #5
    doreyu
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    Re: Needing 3x8pin on G2 650W 2020/11/21 13:57:41 (permalink)
    Thanks for that info. I did end up ordering an 850W Seasonic Focus GX. I wanted to add the extra headroom for any future PSU recommendation increases....
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    gabolton
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    Re: Needing 3x8pin on G2 650W 2020/11/21 14:21:06 (permalink)
    doreyu
    Thanks for that info. I did end up ordering an 850W Seasonic Focus GX. I wanted to add the extra headroom for any future PSU recommendation increases....



    No problem at all. Happy to help. TBTH the only reason I checked what my power draw was is because I read soooo many "OMG my 30XX sucks" posts that were later resolved as PSU issues so I was curious what my system pulled from my battery backup. My 1500W battery backup that had 15 minutes of battery runtime with an OC'd i5-9600K and a 2070S now has 4 minutes.
     
    Oh .. and I had to back off of my 5.1 all core overclock as well down to 5.0 all core or the system wasn't stable without pushing more voltage than I was comfortable with. This is just a guess but I think under load the 3080 draws so much power that anything that's kind of janky with a CPU/Memory OC is going to cause issues. Matter of fact, assuming you run 1440P or higher, if you have any doubt at all about your systems stability I'd go back to bone stock with only an XMP or XMP2 profile, get your GPU where you want it and only then would I start working on a CPU overclock. If you're running 1080p or lower then you spent a lot of $ on a GPU that 99% of the time is going to be CPU bound.

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    ty_ger07
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    Re: Needing 3x8pin on G2 650W 2020/11/22 06:55:12 (permalink)
    Imagine a 650 watt power supply with 3 8-pins connectors. 525 watts of the 650 watt power supply would be available to the video card. That makes no sense.
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