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PowerColour Releasing Devil13 HD7990 In September
- Thread starter Stripes
- Start date
Associate
- Joined
- 6 Sep 2012
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- 12
The specific goal for this machine is to simulate the performance of a mid-2013 GPGPU production server (8 GPU) by overclocking this year's GPUs. More generally we're always looking for ways to increase the OpenCL performance of our developer workstations.
A few review sites say 7990 and the GTX690 are on par, 1 or 2 fps that is all.
From the ones I have seen it mirrors the GTX 680 vs HD 7970
The GTX 690s slightly better up to 1600p the HD 7990 is better beyond 1600p
It all depends which reviews you read theres a few in this thread.
Soldato
- Joined
- 29 Sep 2010
- Posts
- 6,528
They probably made them triple slot as they weren't expecting someone to buy 4! 
That's going to be one powerful machine.
That's going to be one powerful machine.
Associate
- Joined
- 6 Sep 2012
- Posts
- 12
Following application of bandsaw, cards now fit into chasis;
When doing this kind of modification it is essential to wear appropriate safety gear.
When doing this kind of modification it is essential to wear appropriate safety gear.
Hope it works for you Starglider, the rig looks epic but I'm not sure it will work properly, dont think 8 GPU's are supported but I desperately hope Im wrong as Im eager to see this running.
May be OK for GPU computing but I'm not sure on the gaming compatibility. Would love to see a heaven benchmark when youre done though
May be OK for GPU computing but I'm not sure on the gaming compatibility. Would love to see a heaven benchmark when youre done though
Associate
- Joined
- 6 Sep 2012
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- 12
Eight AMD Firestreams work fine in the production 4U rack servers, but it's true that the 7990s are completely untested for GPGPU; the extra PCI-E switch seems to confuse the OpenCL driver.
May be OK for GPU computing but I'm not sure on the gaming compatibility. Would love to see a heaven benchmark when youre done though
4 GPUs is the max supported for normal 3D rendering (Crossfire X or SLI), so the guys doing liquid nitrogen runs on 4 x 7990s or 4 x 680s will easily beat this on Heaven, 3DMark etc. However for OpenCL benchmarks e.g. SmallLuxGPU this might be world record capable.
That said we could create a second virtualised Windows instance and assign the other 4 GPUs to it; might be possible to run two separate quad crossfire arrays on the same machine that way (outputting to separate displays).
Associate
- Joined
- 6 Sep 2012
- Posts
- 12
Fit-testing the liquid cooling components;
There is more tubing on the other side of the case (to reduce the amount over the motherboard). This is a single-loop setup, albeit a fairly complex one.
I've used a mix of 3/8th and 1/2 inch ID tubing and barb and compression fittings, as appropriate for different bits of the loop. It's fairly restrictive but that problem is solvable simply by using two of the most powerful pumps available.
Soldato
- Joined
- 22 Jul 2012
- Posts
- 16,216
- Location
- London
Absolutely mental! I love it 
Soldato
- Joined
- 25 Sep 2009
- Posts
- 10,340
- Location
- Billericay, UK
So what water cooling kit are you using?
Those unofficial 7990's are one impressive peace of kit BTW but I do wonder why Powercolor just didn't ship them with pre built waterblocks in the first place. The sort of power buyer who owns this stuff would most likely have a water cooling setup (lets face it the Devil13 isn't a mainstream product) to start with and that would solve the problem of how to keep such a powerful card cool. Add in the fact that Powercolor are having to ship this cards with a GPU support upright to keep it from snapping your motherboard it's a no brainer to me.
Those unofficial 7990's are one impressive peace of kit BTW but I do wonder why Powercolor just didn't ship them with pre built waterblocks in the first place. The sort of power buyer who owns this stuff would most likely have a water cooling setup (lets face it the Devil13 isn't a mainstream product) to start with and that would solve the problem of how to keep such a powerful card cool. Add in the fact that Powercolor are having to ship this cards with a GPU support upright to keep it from snapping your motherboard it's a no brainer to me.
Associate
- Joined
- 6 Sep 2012
- Posts
- 12
Partial cover plates based on EK blocks, passive sinks on the reverse side RAM. This is the loop design;
From an engineering standpoint I completely agree, would actually be cheaper to design (and probably manufacture!) a factory waterblock than the utterly monstrous air coolers. Sadly I think there is a significant e-peen market out there who have don't have the skill or motivation to put together a watercooled machines but still buy these cards just to have the top of the range.