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+--- Thread: 2x7990 or 4x7970 (/thread-2043.html)
2x7990 or 4x7970 - random2 - 02-05-2013
I'm buying a PC with gfx cards just for hash cracking.
I have a budget around $2.5k (+/- $500). I read about HD7990 that this one like 2x7970.
1. Which is the better: 2x7990 or 4x7970?
2. Which motherboard supports 4 video cards? I read that the usual motherboard supports only 3 GPUs. And I read there, at this forum about PC with 8GPUs. But it was a server motherboard.
Thanks
RE: 2x7990 or 4x7970 - themask - 02-05-2013
You better have 4x7970. 7990 is not an official card, it take huge amount of power and take 3 slots. (Tests showed that it slower than 2 separate card as the 7990 is basically just 2 7970 crossfired)
Lot of motherboards support 4 Vga, if they have enough PCI-E slots. (AMD driver is limited to 8 GPU per Motherboard)
RE: 2x7990 or 4x7970 - random2 - 02-05-2013
Thank you for fast reply.
Great! Will buy 7970.
As for the MB, could you give me advice in model. For example "Asus P8Z77-V LK" have only 3 PCI-E... or not?
RE: 2x7990 or 4x7970 - KT819GM - 02-05-2013
GA-990FXA-UD7 - cheap and works okay.
RE: 2x7990 or 4x7970 - random2 - 02-05-2013
ASUS P8Z77-V PREMIUM can be used as 4 PCI-E x8 or 2 PCI-E x16. But if I will use it as 4 PCI-E x8 how it will affect the speed?
Also about model of HD7970. Does it matter? I was advised to Gigabyte.
RE: 2x7990 or 4x7970 - themask - 02-05-2013
It won't affect the speed even if you use 1x since cracking require little bandwitch (compared to 3d)
RE: 2x7990 or 4x7970 - random2 - 02-05-2013
Okay. It's good. So the last question about GPU. "Gigabyte" or it does not matter? What do you suggest?
P.S. as I read, other components (HDD, RAM) may be the cheapest, right? Attention should be given to power supply unit and cooling system?
RE: 2x7990 or 4x7970 - themask - 02-05-2013
(02-05-2013, 02:00 PM)random2 Wrote: Okay. It's good. So the last question about GPU. "Gigabyte" or it does not matter? What do you suggest?It don't matter. It only matter if you going to OC them. I personally use Sapphires.
P.S. as I read, other components (HDD, RAM) may be the cheapest, right? Attention should be given to power supply unit and cooling system?
Power-supplies and Cooling are very important.
RE: 2x7990 or 4x7970 - epixoip - 02-05-2013
if you are going to put the GPUs into a case, then you should probably buy reference design cards.
RE: 2x7990 or 4x7970 - random2 - 02-06-2013
(02-05-2013, 02:08 PM)themask Wrote: I personally use Sapphires.How many GPUs do you have? Also 4?
(02-05-2013, 02:08 PM)themask Wrote: Power-supplies and Cooling are very important.Will there be enough 1000W-power supply?
epixoip Wrote:if you are going to put the GPUs into a case, then you should probably buy reference design cards.You mean a specific model of video card?
I read reviews about HIS, it has a good cooling system.
Also Gigabyte has 3 fans (others has only 2 fans).