I also have 2 non malta 7990s.
I get 1280 per board with 1050 cores although also undervoltaged. Power consumption was 850ish from the wall, so - system and psu thats about 310W per GPU.
So even though my partner boards have 3x8pins, they have the same power draw as these 'new' cards, and cheaper. These are $1000 release cards, so £800 with VAT added. I paid £680ish, although there are more games with this.
However I see a serious problem with these cards:
They've put them in dual slot coolers. At stock clocks they were loading just below the 80s, horizontally mounted in an open air, single card system. This was on GPGPU computing. ZERO air is exhausted and its all left to be removed by the case.
My 3 slot cards and their 3kg of heatsink struggle together, even with a riser'ed slot gap. The bottom card loads at +45-50 above ambient, and the top card +55-65 above ambient. [Note I don't have voltage control of the 2nd core on each card for some reason, hopefully this will arrive with newer drivers as I have control when there is only ONE card - this will improve temps slightly]. This is with a 1050 core.
Now I can honestly say there just isn't going to be any way that you could put 2 of these cards in a case and expect the top one not to overheat. I have 3x250mm, 5x240mm of fans removing heat from cards that semi exhaust - these don't at all. You will have to open air, just have to.
I'm more than happy with my 3 slot non Maltas, think I got it right.
I get 1280 per board with 1050 cores although also undervoltaged. Power consumption was 850ish from the wall, so - system and psu thats about 310W per GPU.
So even though my partner boards have 3x8pins, they have the same power draw as these 'new' cards, and cheaper. These are $1000 release cards, so £800 with VAT added. I paid £680ish, although there are more games with this.
However I see a serious problem with these cards:
They've put them in dual slot coolers. At stock clocks they were loading just below the 80s, horizontally mounted in an open air, single card system. This was on GPGPU computing. ZERO air is exhausted and its all left to be removed by the case.
My 3 slot cards and their 3kg of heatsink struggle together, even with a riser'ed slot gap. The bottom card loads at +45-50 above ambient, and the top card +55-65 above ambient. [Note I don't have voltage control of the 2nd core on each card for some reason, hopefully this will arrive with newer drivers as I have control when there is only ONE card - this will improve temps slightly]. This is with a 1050 core.
Now I can honestly say there just isn't going to be any way that you could put 2 of these cards in a case and expect the top one not to overheat. I have 3x250mm, 5x240mm of fans removing heat from cards that semi exhaust - these don't at all. You will have to open air, just have to.
I'm more than happy with my 3 slot non Maltas, think I got it right.
Which board are you using? In the past I used a Rampage III Extreme with 2 GTX 580 DCII GPUs that were triple slot. By using PCIe slots 1 and 3, the cards had 1 slot between each other. Both cards sat at comfortable temps while gaming but I imagine they'd roast like my 5870s do with no gap between the cards.
Oh I've risered a slot in between them.
But just reminded me actually, the PCs are actually 3.2 slot. They take up 3 slots AND the typical gap between the bottom and next slot. Running without a free gap you can only mine on 3 cores. Regardless of the underclock, TDP limiting, undervolting or intensity, the 4th core always overheats.
I have a slot at the moment and there isn't a lot of head room at all.
to quick to type.. $100 would be a steal !