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AMD 6990 (x2) or GTX580 HydroCopper 2 (x2) - Page 5

Poll Results: AMD 6990 or GTX580 HydroCopper 2

 
  • 54% (41)
    AMD 6990 in CF
  • 45% (34)
    GTX580 HC2 in SLi
75 Total Votes  
post #41 of 61
Thread Starter 
Quote:
Originally Posted by tconroy135 View Post
Really no idea, we have to wait on benchmarks and actually figure out what the 595 is...
I thought this looked promising.
post #42 of 61
Quote:
Originally Posted by Levesque View Post
This. +1. Why pay more for less?
Hmm why wouldn't you buy the 3GB GTX 580, -rep

http://www.gainward.com/main/vgapro.php?id=454



http://www.palit.biz/main/vgapro.php?id=1503

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post #43 of 61
Quote:
Originally Posted by tconroy135 View Post
Blasphemy.
    
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post #44 of 61
Don't get the Hydro Copper cards get regular 580s and some EK waterblocks. Those hydro copper blocks are crap.

I would wait till the 7xxx and GTX6xx series hit before you consider upgrading.
post #45 of 61
Quote:
Originally Posted by tconroy135 View Post
No its not, you can compare a dual-gpu solution to another dual-gpu solution.
If you want to compare a single GPU to a dual-gpu then you need to compare the single gpu in SLI or CFX versus the dual card.
You can compare them quite easily, people compare the i7-980x to the i7-2600 even though one has 8threads and the other has 12. AMD's answer to the GTX580 is their HD6990, just because you can't stand Nvidia not being the best doesn't mean they aren't comparable.
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post #46 of 61
6990 x2 in CF would mean QuadFire vs 580 x2 in SLI...assuming decent drivers for the 6990 you should get very good performance in eyefinity.

At super high res with eyefinity, you'll want the bigger VRAM from the 6990. I think the 6990 should have at least 2GB, but I think it's supposed to have 4GB of VRAM. So yeah, 4GB in QuadFire vs 1.5GB in SLI. The AMD should win out.

edit: But of course with the GTX 590/595 coming out it'll be interesting to see how that stacks up to the 6990. So yeah, just wait until both top-end cards are out and then decide from the reviews.
Edited by nist7 - 1/28/11 at 7:21am
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post #47 of 61
Quote:
Originally Posted by nist7 View Post
6990 x2 in CF would mean QuadFire vs 580 x2 in SLI...assuming decent drivers for the 6990 you should get very good performance in eyefinity.

At super high res with eyefinity, you'll want the bigger VRAM from the 6990. I think the 6990 should have at least 2GB, but I think it's supposed to have 4GB of VRAM. So yeah, 4GB in QuadFire vs 1.5GB in SLI. The AMD should win out.

edit: But of course with the GTX 590/595 coming out it'll be interesting to see how that stacks up to the 6990. So yeah, just wait until both top-end cards are out and then decide from the reviews.
Vram never increases as information is mirrored across each card in SLI or CFX. so the 3GB 580 in quad sli is going to beat the 6970 in quad CFX easily because as far as vram is concerned it will not only be faster, but will also have more space.
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post #48 of 61
Quote:
Originally Posted by tconroy135 View Post
Vram never increases as information is mirrored across each card in SLI or CFX. so the 3GB 580 in quad sli is going to beat the 6970 in quad CFX easily because as far as vram is concerned it will not only be faster, but will also have more space.
I know VRAM does not double when you CF or SLI. But I believe EACH 6990 is supposed to have 4GB of VRAM per card. I wasn't entirely sure if each 6990 would have 2 or 4 GB but I think it should be closer to 4GB since it will be their top end card and the people who buy that will surely have more than 4GB of system RAM.
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post #49 of 61
Quote:
Originally Posted by nist7 View Post
I know VRAM does not double when you CF or SLI. But I believe EACH 6990 is supposed to have 4GB of VRAM per card. I wasn't entirely sure if each 6990 would have 2 or 4 GB but I think it should be closer to 4GB since it will be their top end card and the people who buy that will surely have more than 4GB of system RAM.
No each GPU has 2GB, which in the end adds up to 4. What ATI is not going to tell you is the actual process is still CFX.

Thus because each GPU has 2gb and they are in CFX, the maximum amount of info that can be carried on the vram is 2gb mirrored across both GPUs vram.
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post #50 of 61
Quote:
Originally Posted by tconroy135 View Post
No each GPU has 2GB, which in the end adds up to 4. What ATI is not going to tell you is the actual process is still CFX.

Thus because each GPU has 2gb and they are in CFX, the maximum amount of info that can be carried on the vram is 2gb mirrored across both GPUs vram.
Whoa. This is new.

While I did slightly forget that a dual-GPU card, while a single card, is basically a factory-built CF/SLI platform. But I didn't know the usable VRAM is actually half of the advertised value. Is this something specific to ATI/AMD?

And does this mean that the 5970 only has "usable VRAM" of 1GB since it's total advertised VRAM is 2GB?

If the logic you mentioned is true, wouldn't it be reasonable to think that similar process applies to the SLI cads as well? That each GPU carries half the advertised VRAM and since it's still in SLI the total usable VRAM is only half the advertised? So GTX 295 really only had usable VRAM of 896MB???

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