hashcat Forum

Hi 
Sorry if this is already posted somewhere but I was unable to find it with search...

I'm building my first rig and can't figure out if I need 2 PSU's  or not, if I plan on running 6 x (GTX 1060 or 1070) GPU's

I plan on buying the following.

MB: ASRock H81 Pro BTC 
CPU: Intel Core i5-4460 Haswell 
RAM: 16GB Kingston HyperX Fury DDR3-1600
GPU: 6 x GIGABYTE GeForce GTX 1070 ITX OC - 8GB or EVGA GeForce GTX 1060 SC GAMING - 3GB
Riser: 6 x Nuovo PCI-E Express 1x A 16x Extender Scheda Alata Adattatore SATA Cavo USB 3.0
PSU: 1 or 2? Club 3D CSP-X1200CS - 1200W PSU - 1200 Watt

Do I need 2 PSU's or can I settle with one or do I go bigger like the EVGA SuperNOVA 1600 G2 - 1600 Watt


Also would it be a problem if I ran 3 x 1060 and 3 x 1070?

any advice would be appreciated, thanks.

- Theo

You're introducing unnecessary complexity and compromising on the quality of components just to run a 6 GPU rig, when you could simply build a smaller, less complex rig with 3 high-end GPUs instead and have a faster, more stable system.

ok thanks!
So what do you recommend instead? 3-4 x GTX 1080 rather than 6 x 1080?
I found some numbers and I can see what you mean... but what about power usage? will the one 1600W PSU still be fine or should I get 2 850W?

eg.
GTX 1060
Hashtype: WPA/WPA2
Speed.Dev.#1.: 205.8 kH/s (94.37ms)
(6 x GTX1060 = 1234,8 kH/s)

GTX 1080
Hashtype: WPA/WPA2
Speed.Dev.#1.: 395.3 kH/s (99.94ms)
(3 x GTX1080 = 1185,8 kH/s)

and also to save money should I downgrade the CPU to a Celeron G1840 instead or would the i5 be better?

+1 for less but faster gpus

GTX 1080 is the sweet spot for both Perf/$ and Perf/Watt.

You should only get one PSU, 80Plus Platinum or Titanium if possible. The wattage is a simple matter of math.

There's no reason to get a shitty CPU. Hashcat can now use CPU & GPU cooperatively, and high-end CPUs with AVX2 support are fast enough that they're actually worth using. For example, see https://twitter.com/jmgosney/status/692124581692358657

Nice CPU... one of those is my entire budget :-)
I did the math.. the 1080 is about 180W average times 3... I was just worried that you had to spread the power load out so that the one PSU didn't get overburdened...
but thanks for the answers...

(10-12-2016, 08:46 PM)TATDWLF Wrote: [ -> ]ok thanks!
So what do you recommend instead? 3-4 x GTX 1080 rather than 6 x 1060?
I found some numbers and I can see what you mean... but what about power usage? will the one 1600W PSU still be fine or should I get 2 850W?

I learned that it is important to buy "Founders Edition" versions not "OC, Gaming, or whatever versions".

Thanks! thats nice to know! The one i picked out (Palit GeForce GTX 1080 GameRock - 8GB) is the "base version" running the lowest MHz of all the variants :-)
Anything else I need to know?

yea, we told u to take a refferce card (Founder eddition) dont know if u understood that since u said u picked a gamerock version..

Yeah.. I see that now... I only looked at the store website and compared models there they don't have the Founder Edition... but can order the JetStream if I want it... that card seems to have the same specs. right?

Graphics Clock Base Clock : 1607MHz / Boost Clock : 1733MHz
Graphics Card Power 180 W