Building 4x GTX 1080 recommendation

[timonline86]

I am planning on building a 4x GTX 1080 hash cracking build and would like recommendations on whether I should go for a socket 1151 motherboard VS 2011v3 one.

Secondly depending on the motherboard, which CPU has enough PCI lanes to effectively run all those cards.

This is a possible build I have in mind but feel free to correct me if it will not work out:

      Case: Corsair 900D
      Motherboard: ASUS Rampage V
      Processor: Intel Core i7 5820K  (Plan to upgrade to i7 6900K eventually)
      GPU: 4x EVGA GTX 1080 Founder's Edition
      RAM: 32GB Quad Channel Memory running at 2400Mhz
      PSU: EVGA SuperNOVA 750 Gold 80+


Any feedback is appreciated

[azren]

You will need more power for your PSU as 4 x GTX 1080 FE will require at least 720W (180W x 4) and 750 W psu won't be enough.

i7 CPU should be able to handle 4 GPU. I'm using i5 and runs 4 x 1080 FE ok.

Best regards,
Azren

[timonline86]

You will need more power for your PSU as 4 x GTX 1080 FE will require at least 720W (180W x 4) and 750 W psu won't be enough.

i7 CPU should be able to handle 4 GPU. I'm using i5 and runs 4 x 1080 FE ok.

Best regards,
Azren

Thanks for responding, so the motherboard and CPU are fine but I just need to up my PSU to 1500W or 1600W one?

[azren]

I beleive 50% to 60% capacity is recommeended for PSU efficiency. So in your case you will need a PSU of 1500W / 1600W PSU.

Read here for explanation of PSU efficiency.

https://www.techpowerup.com/forums/threa...ly.129456/

By the way, Im using a 1200W PSU from my old build.

Best regards
Azren

[timonline86]

Updated my question to a 1500/1600W PSU based on your advice.

Am I good to go with these specs?

      Case: Corsair 900D
      Motherboard: ASUS Rampage V
      Processor: Intel Core i7 5820K  (Plan to upgrade to i7 6900K eventually)
      GPU: 4x EVGA GTX 1080 Founder's Edition
      RAM: 32GB Quad Channel Memory running at 2400Mhz
      PSU: Corsair AX1500i 80+ Titanium

[kamsulla]

Updated my question to a 1500/1600W PSU based on your advice.

Am I good to go with these specs?

      Case: Corsair 900D
      Motherboard: ASUS Rampage V
      Processor: Intel Core i7 5820K  (Plan to upgrade to i7 6900K eventually)
      GPU: 4x EVGA GTX 1080 Founder's Edition
      RAM: 32GB Quad Channel Memory running at 2400Mhz
      PSU: Corsair AX1500i 80+ Titanium

4xcards very very high temp.
Im not sure1, cooling gpu's this case. I check the image this case and fans only "disc side".
Im not sure2, power 320-400watt per card, link, I using 1000w psu 2 x gtx1080 at single xeon cpu.

[kiara]

1, temps might be an issue, u did not mention what case will u use but u should take in mind that the cards should never reach over 79C, after this point 80-82C the card will throttle, so make sure to take fans that push enough air inside the case aswell taking it out.
2, the PSU that u mention (1500) is more than enough
3, on the mobo
u need to take in mind that the mobo that u offered here as no vga port..
unless u planing to run a linux os on them, because when using one of the DVI/HDMI port of the cards when u will run the attacks it will be laggy as hell.

[unforgiven]

1, temps might be an issue, u did not mention what case will u use but u should take in mind that the cards should never reach over 79C, after this point 80-82C the card will throttle, so make sure to take fans that push enough air inside the case aswell taking it out.
2, the PSU that u mention (1500) is more than enough
3, on the mobo
u need to take in mind that the mobo that u offered here as no vga port..
unless u planing to run a linux os on them, because when using one of the DVI/HDMI port of the cards when u will run the attacks it will be laggy as hell.

I'm using a HDMI port on a card (conected to my monitor) being under pressure of hashcat and there was no problem.

[unforgiven]

ok i'm late but it might be good for people who are planning to build such a thing.

So if you mean ROG RAMPAGE V EDITION 10 i gotta say no. you can't achieve what you want.
i have not tested but from what we can find out from specs here:
https://www.asus.com/us/Motherboards/ROG...fications/
with a Core i7 5820K you can't get 4x gpus to work.

Look at expansion slots part:
4 x PCIe 3.0/2.0 x16 (x16, x16/x16, x16/x8/x8, x16/x8/x8/x8 or x8/x8/x8/x8 mode with 40-LANE CPU; x16, x16/x8 or x8/x8/x8 mode with 28-LANE CPU)

The 5820k only supports 28 lanes so you are going for x8/x8/x8 mode at most!

The RAMPAGE V EXTREME also has the same problem.
I would be happy to hear any opposite ideas.

[kiara]

ok i'm late but it might be good for people who are planning to build such a thing.

So if you mean ROG RAMPAGE V EDITION 10 i gotta say no. you can't achieve what you want.
i have not tested but from what we can find out from specs here:
https://www.asus.com/us/Motherboards/ROG...fications/
with a Core i7 5820K you can't get 4x gpus to work.

Look at expansion slots part:
4 x PCIe 3.0/2.0 x16 (x16, x16/x16, x16/x8/x8, x16/x8/x8/x8 or x8/x8/x8/x8 mode with 40-LANE CPU; x16, x16/x8 or x8/x8/x8 mode with 28-LANE CPU)

The 5820k only supports 28 lanes so you are going for x8/x8/x8 mode at most!

The RAMPAGE V EXTREME also has the same problem.
I would be happy to hear any opposite ideas.

hashcat work perfectly with x4 . i dont see any problem with that.
the problem can happen if u try to mount big dics, but even that x4 is enough to load it all, 
if u would use a riser the problem above could apply u, but x4 is good enough
some one correct me if im wrong

from wiki