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AMD 6990 (x2) or GTX580 HydroCopper 2 (x2) - Page 6

Poll Results: AMD 6990 or GTX580 HydroCopper 2

 
  • 54% (41)
    AMD 6990 in CF
  • 45% (34)
    GTX580 HC2 in SLi
75 Total Votes  
post #51 of 61
Quote:
Originally Posted by nist7 View Post
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???

Yes that is true about the 5970, I should know, I owned one of them. I am unsure if only ATI does this, but I highly doubt it.

You need to understand that the reason for this is that both GPUs are contributing to the same image so they both need the same information on their vram to render the image.

So if you want to know the "usable" vram(although all the vram is being used think of it as Raid 1 ) then you halve what is advertised for Dual-gpu cards.

Edit: The best way to undertand it is to maybe think of it as they are not sharing the Vram each gpu has its own vram and thus it has to be mirrored between the GPUs. I am unsure of the technical reasons why they can't share vram, but nonetheless they can't...
Edited by tconroy135 - 1/28/11 at 8:06am
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post #52 of 61
Quote:
Originally Posted by tconroy135 View Post
Yes that is true about the 5970, I should know, I owned one of them. I am unsure if only ATI does this, but I highly doubt it.

You need to understand that the reason for this is that both GPUs are contributing to the same image so they both need the same information on their vram to render the image.

So if you want to know the "usable" vram(although all the vram is being used think of it as Raid 1 ) then you halve what is advertised for Dual-gpu cards.

Edit: The best way to undertand it is to maybe think of it as they are not sharing the Vram each gpu has its own vram and thus it has to be mirrored between the GPUs. I am unsure of the technical reasons why they can't share vram, but nonetheless they can't...
Ah, I see. It makes total sense now. Since I know that if you SLI/CF two single-GPU cards the VRAM does not double since you mentioned it both GPU's must render same image they must have the same data/VRAM. And so this basic principle should apply to factory-built SLI/CF cards with dual-GPUs.

And yeah I guess you can't really share one huge VRAM bank so to speak between two GPUs.

And so logically speaking I highly doubt the NVIDIA cards are any different since the principle is so basic and fundamental and if NVIDIA did figure out how to share a large VRAM bank then it should be HUGE news.

But in the end, I guess AMD squeaks by with 2GB vs NVIDIA's 1.5GB of VRAM in both of their highest end GPU setup. So I'm not sure where you got the 3GB of VRAM with 580s in Quad-SLI setup from?

Quote:
Originally Posted by tconroy135 View Post
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.
The dual-GPU GTX590/595 will be advertised as 3GB for sure but if this principle is true, then the usable VRAM would only be 1.5GB vs the 6990's 2GB. Unless you're implying that NVIDIA will use 3GB of VRAM per GPU and they won't advertise it as 6GB but as 3GB in their marketing. (Which I guess is possible for their previous dual GPU cards too but then again this seems like a big difference between the two companies)

Of course we'll have to wait for reviews to come out and there are other factors more than just the size of the VRAM to account for total GPU performance.
Edited by nist7 - 1/28/11 at 8:16am
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post #53 of 61
Quote:
Originally Posted by nist7 View Post
But in the end, I guess AMD squeaks by with 2GB vs NVIDIA's 1.5GB of VRAM in both of their highest end GPU setup. So I'm not sure where you got the 3GB of VRAM with 580s in Quad-SLI setup from?

If you look at my previous posts in this thread you will see that the 580 has non-reference editions with 3gb of Vram from Gainward and Palit respectively.
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post #54 of 61
Quote:
Originally Posted by tconroy135 View Post
If you look at my previous posts in this thread you will see that the 580 has non-reference editions with 3gb of Vram from Gainward and Palit respectively.
Ahh....

Damn I'm getting pwned left and right today. hehe

Hey thanks alot for that. Looks like a beastly card for sure! Just like how there are 2GB versions of the 5870.

But hey! Maybe they're working on a 4GB 6970?

But otherwise yes, it looks like the 3GB 580 x4 is currently the most beastly setup so far!
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post #55 of 61
Quote:
Originally Posted by nist7 View Post
But otherwise yes, it looks like the 3GB 580 x4 is currently the most beastly setup so far!
Yeah, but you have to be a Sultan or something to afford such a setup.
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post #56 of 61
Quote:
Originally Posted by tconroy135 View Post
Yeah, but you have to be a Sultan or something to afford such a setup.
And a quick glance in to the Intel-Build Logs section of the forum, it seems OCN don't have a shortage of Sultans...ha

Hell, just look at this thread. A guy seriously considering 2 6990s (probably $1500+ in cost total)
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post #57 of 61
Tri/Quad crossfire is pure failure so far with my testing of the 6970 for Eyefinity. It works fine for single monitor, but once I go Eyefinity 4 out of 5 games crash outright with either 3 or 4 6970's. I've tried every driver from 10.12 to 11.1a and they all live up to AMD's sucky driver image.

I've pre-ordered three 3GB Palit GTX 580's at Amazon.
Edited by CallsignVega - 1/28/11 at 10:40am
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post #58 of 61
Quote:
Originally Posted by WorldExclusive View Post
I would go with the 6990s.

The 580s needs more vram for three monitor setups.
Indeed.... Nvidia always had this thing with putting low memory capacity on there cards and they also zap more power because of there higher bus interface....

Multi monitor setup's will always be a win with the ATI side of the force

I'm going to be tradeing in my 6870 for a 6990 once it's released
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post #59 of 61
Quote:
Originally Posted by Atomfix View Post
Indeed.... Nvidia always had this thing with putting low memory capacity on there cards and they also zap more power because of there higher bus interface....

Multi monitor setup's will always be a win with the ATI side of the force

I'm going to be tradeing in my 6870 for a 6990 once it's released
Um no. GTX 580 has 3GB versions now for the ultimate multi-monitor setup.

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post #60 of 61
Quote:
Originally Posted by CallsignVega View Post
Than I wasen't upto date with the new listing's lol, Fair enough, 3GB of memory is good fair play
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