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Powering 6 vega 64 with a 1600 psu ?

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Rofos
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2017/11/22 17:57:02 (permalink)
Vega support claims that the p2/g2/t2 series doesn't include any 8 pin to dual 8pin cables while other people claim it has. I still haven't receive it so i don't know but i want to be sure.
Does it come with them ?
 
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    Sajin
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 18:15:13 (permalink)
    They don't.
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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 18:25:38 (permalink)
    Sajin
    They don't.


    Thanks for your reply .Is there any psu from evga around 1600 watt that comes with 1x8pin to dual8pin connectors?I can see this as the only way to power up 6 vega 64(since they require 2x8pin)from one psu , 
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    Sajin
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 18:31:16 (permalink)
    Nope, there isn't. If you need cables like that you'll need to purchase them... https://store.cablemod.com/configurator/
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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 18:41:26 (permalink)
    Sajin
    Nope, there isn't. If you need cables like that you'll need to purchase them... 


    I have hear mixed opinions when it comes to dual cables and since this is my first build i am kinda scared getting my house on fire. 
    Which one would be 8pin to dual 8 pin ?
     

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    Sajin
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 19:07:01 (permalink)
    The one you have selected is correct. It should show you on the site once you add it. Make sure you selected custom psu cables at the beginning of the configurator.
    post edited by Sajin - 2017/11/22 19:08:29
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    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 19:18:28 (permalink)
    The bigger issue you are overlooking is even 1600W enough to power 6 of those cards. I think that it will not be enough and you'll over load the power supply. Simple math will tell you that with a 300W TDP each gives you 1800W without counting the motherboard CPU and other devices.


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    Sajin
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/22 19:42:06 (permalink)
    Chris21010
    The bigger issue you are overlooking is even 1600W enough to power 6 of those cards. I think that it will not be enough and you'll over load the power supply. Simple math will tell you that with a 300W TDP each gives you 1800W without counting the motherboard CPU and other devices.

    Maybe he plans to undervolt, underclock, and only power the cards themselves.
    post edited by Sajin - 2017/11/22 19:48:06
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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 03:33:37 (permalink)
    Sajin
    Chris21010
    The bigger issue you are overlooking is even 1600W enough to power 6 of those cards. I think that it will not be enough and you'll over load the power supply. Simple math will tell you that with a 300W TDP each gives you 1800W without counting the motherboard CPU and other devices.

    Maybe he plans to undervolt, underclock, and only power the cards themselves.


    Yes i am planning to undervolt and underclock them .I will power everything from the psu but the cards themselfs won't take more than 220w each.

    The question is if it's safe and if the card will get enough power by using a 8pin to dual8pin .Thanks everyone for ur input.
    post edited by Rofos - 2017/11/23 04:25:59
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    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 07:14:32 (permalink)
    I am running 5x 1080ti with single 8pin to dual 8 pin no problem there. The only non safe thing would be to accidentally trying to hash without setting your under volt/clock and overload the psu.


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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 07:31:06 (permalink)
    Chris21010
    I am running 5x 1080ti with single 8pin to dual 8 pin no problem there. The only non safe thing would be to accidentally trying to hash without setting your under volt/clock and overload the psu.

    Thank you so much for your input , i truly appreciate it.
    If you are in EU do you have any source that sells High quality 8pin to dual 8pin?
    post edited by Rofos - 2017/11/23 08:06:06
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    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 13:30:22 (permalink)
    I am not and i made my own from moddiy.com


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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 14:15:57 (permalink)
    Chris21010
    I am not and i made my own from moddiy.com

    Thanks for replying. Seems like that website ships wordwide. The only ones i could find were :
    .com/search.php?search_query=8pin+to+dual+6%2B2pin&x=0&y=0
    .com//products/Bitcoin-Mining-CPU-8pin-TO-2-PCI%252dE-6%252b2pin-Splitter-Cable.html
     
     
    Which seems to be the same?
     
    Also found those on ebay
    .com/itm/PCI-E-Graphics-Card-Modular-Power-Cable-Lead-8-pin-to-Dual-8-pin-Antec-ECO-TP/112615443351?hash=item1a38674b97:g:3gsAAOSwHNdZykDV
     
    Can you link me the ones u bought just to make sure i miss something ?
     
    Also how do you power your risers? My psu only has 5 sata ports.
    post edited by Rofos - 2017/11/23 14:18:48
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    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 15:06:23 (permalink)
    No, i made them. I bought wire, terminals, and connectors and made the whole cable myself. I would not recommend this as its really an art form.


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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 15:26:22 (permalink)
    Chris21010
    No, i made them. I bought wire, terminals, and connectors and made the whole cable myself. I would not recommend this as its really an art form.

    Ok i would just buy the ones i see on ebay (if my psu doesn't come up with them).
     
    Do you power your risers through the sata cables ur psu provides? I hear that it's not safe and the riser cable can melt.
     
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    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 17:05:06 (permalink)
    I do not use risers, i can not comment on that.


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    Ranmacanada
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/23 18:23:51 (permalink)
    Rofos
    Chris21010
    No, i made them. I bought wire, terminals, and connectors and made the whole cable myself. I would not recommend this as its really an art form.

    Ok i would just buy the ones i see on ebay (if my psu doesn't come up with them).
     
    Do you power your risers through the sata cables ur psu provides? I hear that it's not safe and the riser cable can melt.
     


    Do not use SATA as SATA will melt.  The cable is only designed to handle a max of about 35 watts of power.  If you're going to power your risers, use your 6 pin from your power supply.  SATA will burn down your house.  

     

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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 08:38:44 (permalink)
    Ranmacanada
    Rofos
    Chris21010
    No, i made them. I bought wire, terminals, and connectors and made the whole cable myself. I would not recommend this as its really an art form.

    Ok i would just buy the ones i see on ebay (if my psu doesn't come up with them).
     
    Do you power your risers through the sata cables ur psu provides? I hear that it's not safe and the riser cable can melt.
     


    Do not use SATA as SATA will melt.  The cable is only designed to handle a max of about 35 watts of power.  If you're going to power your risers, use your 6 pin from your power supply.  SATA will burn down your house.  


    1)6 pin to 6 pin directly from the psu to the risers?
    2)Since i have five 6pin slots and 6 risers + the ssd , is it safe to use a 6pin to dual 6 pin to power 2 risers ?
    so 3 risers directly to psu using 6pin to 6pin cable.
    2 risers with 6pin to dual 6pin
    1 riser +ssd 6pin to dual 6 pin.
     
    I truly appreciate your input .
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    Ranmacanada
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 09:29:22 (permalink)
    Everywhere I've looked, What you are doing is not recommended.  No more than 3-4 Vega per system, period.  Not only do you run the risk of burning down your house, but the sheer amount of work involved and registry hacks and stuff makes it a living nightmare.  Most people have a hard enough time doing 3 Vega cards, let alone 4.  Doing 6, is a nightmare and.  I would suggest you head over to reddit.com/r/ethminer as they are far more knowledgeable in the build area.  I do hope you will be using the cards for cryptonight, as that is what vega is the best at.
     
    https://www.reddit.com/r/MoneroMining/comments/74hjqn/monero_and_vega_the_definitive_guide/ here is a nice guide for you.  As you can see, he recommends only 3 cards.  6 is completely unmanageable.  I would suggest reading through the posts, and if you have a reddit account, asking some questions there.  They are the experts when it comes to Vega, specially in the thread I've linked.
     

     

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    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 10:41:20 (permalink)
    Ranmacanada
    Everywhere I've looked, What you are doing is not recommended.  No more than 3-4 Vega per system, period.  Not only do you run the risk of burning down your house, but the sheer amount of work involved and registry hacks and stuff makes it a living nightmare.  Most people have a hard enough time doing 3 Vega cards, let alone 4.  Doing 6, is a nightmare and.  I would suggest you head over to reddit.com/r/ethminer as they are far more knowledgeable in the build area.  I do hope you will be using the cards for cryptonight, as that is what vega is the best at.
     
     here is a nice guide for you.  As you can see, he recommends only 3 cards.  6 is completely unmanageable.  I would suggest reading through the posts, and if you have a reddit account, asking some questions there.  They are the experts when it comes to Vega, specially in the thread I've linked.
     


    Hey , already read everything on the reddit subforums both on gpumining and xmr mining . Didn't have anyone telling me not to do 6 . Opened threads on both of those subreddits  as well as here , ethereum mining , thebitcoin.pub , emailed saphire and cablemod . So i am not sure where u got those info . Had people who have 6 evga rigs running safely the thing is i don't understand how they power their risers.Some of those users power their risers through sata cables and say 2 risers per sata is fine but i dont want to risk it so if u wouldn't mind :
     
    1)Where did u get the info not to do more than 3-4 on the same rig.
    2)I would appreciate if u can answer my question above (i may make 2 rigs x4 cards if that's what safe if i find info on q 1)
     
    Thanks for concerning about me even if i don't personally know you. 
    post edited by Rofos - 2017/11/24 10:43:04
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    Ranmacanada
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 10:49:39 (permalink)
    I'd have to go through all the threads again, but from what I can remember, if you're using windows, it's a living hell to get 4 vegas to work properly with wattman, as it will constantly crash and be unstable.  As for the sata cable, the cable itself is only designed to handle 35 watts, and the riser draws 75 (pcie spec).  If you use a higher quality cable, you should be fine, but personally, I would not risk it.  From the sheer amount of threads of people who have had cables melt, a few houses that have almost burnt down, etc, spend a few more dollars for piece of mind.

     

    ASUS TUF GAMING X570-PLUS (WI-FI)
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    #21
    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 11:02:45 (permalink)
    Ranmacanada
    I'd have to go through all the threads again, but from what I can remember, if you're using windows, it's a living hell to get 4 vegas to work properly with wattman, as it will constantly crash and be unstable.  As for the sata cable, the cable itself is only designed to handle 35 watts, and the riser draws 75 (pcie spec).  If you use a higher quality cable, you should be fine, but personally, I would not risk it.  From the sheer amount of threads of people who have had cables melt, a few houses that have almost burnt down, etc, spend a few more dollars for piece of mind.


    Hey maybe that was when vegas came out. everything seems good now but i may make 2 rigs if i see problems
     
    The thing that everyone doesn't understand is that i don't mind throwing more $ if you can guide me in the right way.This is my first mining rig and i learned everything from searching on the forums so when you are telling me to buy better cables or use molex i don't understand what u are saying . I googled the issue but haven't got anywhere. I know the issue about the sata cables that are melting due to them not being able to handle more than 50 watts. 
    Riser has a 6 pin slots , psu sata ports have a 6 pin slot . If i power them from the psu directly would i just use a 6pin to 6 pin cable ? Or what you mean buy a better cable.
    #22
    bcavnaugh
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 11:20:51 (permalink)
    Ranmacanada knows what he is taking about I would listen to what he has to say.

    post edited by bcavnaugh - 2017/11/24 11:21:52

    Associate Code: 9E88QK5L7811G3H


     
    #23
    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 11:57:30 (permalink)
    bcavnaugh
     knows what he is taking about I would listen to what he has to say.



    I am waiting for his reply on what cables should i choose. Would prefer a link so i can understand what he means .
     
    Saying molex or better cables to a newbie doesn't solve anything . Googling molex just shows a bunch of cables. I am already aware of this issue.
    #24
    Ranmacanada
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 12:49:56 (permalink)
    Yes you would use the 6 pin to 6 pin cable, or a molex.  I'll be blunt.
     
    https://www.reddit.com/r/...power_gpus_and_risers/
     
    If you have a SATA riser - DON'T USE ADAPTERS AT ALL (ie molex to SATA), only SATA cable straight from psu.
    If you have a 6pin riser - You can use adapters with good wires (not from China!) but you should draw it straight from psu.
    If you have a MOLEX riser - You can use adapters with good wires (not from China) but you should draw it straight from psu.
     
    This is where your cable purchasing comes in, and why running only 3-4 cards per power supply for these big cards is needed, as you need all the extra 6 pins for your risers.  6-8 8 pins for your cards and 3-4 6 pins for your risers.  That's all the VGA outs on a PS typically gone.  Specially as you are going to need to run separate 8 pins per card, you do not want to daisy chain them (not enough power draw).

     

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    #25
    Rofos
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/24 13:48:04 (permalink)
    Ranmacanada
    Yes you would use the 6 pin to 6 pin cable, or a molex.  I'll be blunt.
     
     
     
    If you have a SATA riser - DON'T USE ADAPTERS AT ALL (ie molex to SATA), only SATA cable straight from psu.
    If you have a 6pin riser - You can use adapters with good wires (not from China!) but you should draw it straight from psu.
    If you have a MOLEX riser - You can use adapters with good wires (not from China) but you should draw it straight from psu.
     
    This is where your cable purchasing comes in, and why running only 3-4 cards per power supply for these big cards is needed, as you need all the extra 6 pins for your risers.  6-8 8 pins for your cards and 3-4 6 pins for your risers.  That's all the VGA outs on a PS typically gone.  Specially as you are going to need to run separate 8 pins per card, you do not want to daisy chain them (not enough power draw).


    Sorry for not linking my riser , here it is  actually a pic cant link
     
    If you have a SATA riser - DON'T USE ADAPTERS AT ALL (ie molex to SATA), only SATA cable straight from psu
       Okey yea sata cable straight from psu then what? The riser needs a 6 pin  , i will be forced to use the first cable on the pic which is a spliter and people advice not to do it.
    If you have a 6pin riser - You can use adapters with good wires (not from China!) but you should draw it straight from psu.
        How is it possible to draw it straight from the psu and use an adapter , that doesn't make any sense to me. You either use an adaptor or staright from psu which the only way i find possible is 6pin to 6 pin.
    If you have a MOLEX riser - You can use adapters with good wires (not from China) but you should draw it straight from psu.
        I don't have one from what i can tell .
     
    Yet you try to help me and i appreciate it that , but you are just getting me confused because i am a noob and what u say doesn't make any sense on my head. Hope my comment clears out everything.
     
    Also yea i am going to return this psu and buy 2x1000w prob g2 by evga.
     
     
    post edited by Rofos - 2017/11/24 14:05:14
    #26
    Ranmacanada
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/25 11:55:10 (permalink)
    Yes running 2 PSU's is safer than putting all your eggs in one basket.  Typically you would run one for the risers and motherboard, and one just for the cards.  Check the sleeving on the adapter and see if it can handle the amps required to run it properly.  You might be lucky and have a proper cable, but odds are you don't.  

     

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    QuintLeo
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/28 12:54:59 (permalink)
    The actual specification FROM MOLEX on the SATA power connector - uses 3 pins for 12 VDC, each pin is rated 1.5 amps MAX for a total of 4.5 amps or 54 watts on 12VDC power draw.
     
    The PCI-E specification allows for a maximum of 75 watts of 12VDC power draw from the PCI-E bus connector (many cards are known to hit more like 80-85 watts draw on peaks in actual testing).
     
    Powering a riser via a SATA connector IS NOT SAFE even if the wiring is sized to do so, as the CONNECTOR is not designed to handle the power level.
     
     
     MOLEX (actually AMP Make-N-Lock but the "Molex" misnaming of the specific connector type stuck decades ago) use 1 pin for 12 VDC, rated at 13 amps - this works out to 156 watts which is way in excess of the PCI-E specified draw and is quite safe.
     The thing to watch for on MOLEX connector use to power risers is the WIRING, not the connector - more than one riser to a single "string" of MOLEX connectors can be iffy if the wiring isn't beefy enough.
     
     
     
     
     Getting Vegas to work at full 2000 (more or less) hashrate on Monero is a nightmare period - due to driver issues and mining software availability, you MUST use the "blockchain" driver, you MUST run Windows 10, and getting it working is a royal PITA.
     LINUX does not yet have working drivers for VEGA at all, much less "large page support" drivers as needed for full hashrate mining Monero, and the "blockchain" driver DOES NOT WORK ON WIN 7 at all despite AMD lies that Win 7 is supported.
     
     (there might be a possible out to run Win 8, but I refuse to have anything to do with the UNUSABLE INTERFACE Win8 inflicted on us after the total nightmare of my one encounter with that POS worse version of Windows ever).
     

    Now that vorsholk has stopped his abuse, I'm returning to folding.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #28
    Chris21010
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/28 15:20:36 (permalink)
    thanks for that info. i was actually looking into Vega to help diversify a bit but with that info i think i'll look elsewhere or wait.


    #29
    QuintLeo
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    Re: Powering 6 vega 64 with a 1600 psu ? 2017/11/28 18:12:34 (permalink)
    There have been a ton of postings all over that more than 4 Vega in a machine either doesn't work at all, or has tons of issues and does not work reliably.
    There are a few folks I've seen post that DID get 4 working in one machine.
     
     Vega 56 only pulls perhaps 250 watts at most (aftermarket cards might increase that limit) and can be easily tuned for under 200 watts per card while pulling well over 1900 hash on Monero mining.
     
     It's also under 200 watts if undervolted for higher core clock when running the Dnet client at over 9 GKeys/sec.
     For reference, my 1080 ti running the DNet client running at stock 250 watt TDP only managed about 10 GKeys/sec on the same client - but I didn't spend a LOT of time trying to optimize that.
     I DO suspect that even the air-cooled Vega 64 or the Vega FE will beat the 1080 ti on Dnet RC5-72 work.
     
     If AMD would get the bloody LINUX drivers working, and if availability and pricing hadn't gone crazy, I'd be all over a few more Vega cards.
     
     I did see one report somewhere that the "reference" Vega cards might be out of production at the moment so AMD could start supplying GPUs and RAM to the 3'd party makers for their custom designs.
     That WOULD explain the current shortage (along with the ongoing HBM2 production issues).
     
     

    Now that vorsholk has stopped his abuse, I'm returning to folding.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #30
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