Good Morning,

Wanted to get some opinions...

I'm looking to upgrade my Dual Xeon server. Currently I have a pair of Nvidia GT640s in there which are doing a fairly good job. I'm looking to swap these out for faster cards, and given that the new Nvidia cards are on the horizon (GTX 1080/GTX 1070) I'm considering my options. Which would you choose out of:

Option1:
-Get a pair of Used Nvidia GTX 980s (not TI) - roughly 9.2 Terraflops

Option 2:
-Keep one of the Nvidia GT 640s and get one Nvidia 1070 - roughly 7 Terraflops


The slots on my motherboard are Dual PCI 2.0 (one 8x, one 4x) but for the purposes of workunits, I don't believe that the slot speed really matters too much considering all it does is copy the work unit to the GPU memory and work on it from there.

I have a 750W PSU which is up to the task of driving two GPUs - Ideally I don't want to spend more than £270 Max, so I'm kind of banking on the cost of the 980 falling when the new 1070/1080 comes out (Happy to buy used if they are still under warranty).

regards

Andrew

Mixing classes of GPU can lead to all sorts of strange effects - if you went to a GTX1070 and a GTX640 you could well run into driver problems as the 1070 is a Pascal and the 640 is a Maxwell...

From the released price information I doubt that a GTX1070 would fall into your budget, I would guess they will be nearer the £300 at launch. You'll probably have more luck getting a couple of GTX980s within your budget - a quick look suggests they currently just outside, but will almost certainly drop a bit as early adopters dump some.

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?