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Does Surround really need 3GB of RAM?

post #1 of 11
Thread Starter 
Quick question, I am thinking of adding a 3rd GTX480 or possibly tri 580s because like the others surround users SLI just doesn't cut it.

However, if I'm not adding any aa/af, will I be benifiting from the 3GB Vram vs the 1.5GB ram of 480 and regular 580?

Currently in titles I can maxed out with no aa/af, the Vram usage is around 1.2GB, that being said I cannot tell how much Vram it used with titles I am having problem with cuz the lowered settings.

My guess is, I am only lacking the processing power but not Vram if aa/af is not considered, correct?
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post #2 of 11
Quote:
Originally Posted by andynolife View Post

My guess is, I am only lacking the processing power but not Vram if aa/af is not considered, correct?
Correct. A 2GB 5870 in Crossfire in this scenario will actually do worse because processing power is not as great even though it has more VRAM. Therefore, it makes sense that two 1.5GB GTX 580s will be even faster.

Quote:
Originally Posted by andynolife View Post

Currently in titles I can maxed out with no aa/af, the Vram usage is around 1.2GB, that being said I cannot tell how much Vram it used with titles I am having problem with cuz the lowered settings.

I dont understand this part
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by youra6 View Post
Correct. A 2GB 5870 in Crossfire in this scenario will actually do worse because processing power is not as great even though it has more VRAM. Therefore, it makes sense that two 1.5GB GTX 580s will be even faster.

[/B]
I dont understand this part
Thanks! +rep!

I was suspecting with lowered graphic settings even ruled out the effects of aa/af, the Vram usage will be varied. So if if I don't maxed out the setting, I cannot project the benifit of 3Gb vs 1.5GB.

Again, my guess is it does play a part but very limited?
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post #4 of 11
I am thinking no as well. I am running three 470's that have 1280MB of Vram with my surround setup and am not having any real issues. I play with Aa/AF on, but have to lower the settings a tad. Wow is maxed, BFBC2 is on high except for textures, MOH is maxed, and Metro 2033 is on medium.
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post #5 of 11
Quote:
Originally Posted by andynolife View Post
Thanks! +rep!

I was suspecting with lowered graphic settings even ruled out the effects of aa/af, the Vram usage will be varied. So if if I don't maxed out the setting, I cannot project the benifit of 3Gb vs 1.5GB.

Again, my guess is it does play a part but very limited?
How do you measure your GPU usage? Through Afterburner? I would play Crysis with the AA/AF raised slightly, (ie: 2X/4AF) then again at (4X/16AF). If the VRAM usage surpasses 1.5GB and you see a noticeable drop in FPS, then you will know that the VRAM is your bottleneck.
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post #6 of 11
Games can only use 1 card's VRAM, so even if you had a total of 3GB VRAM from dual 580's you'd only properly be able to use half of it.

Obviously it would be better to go for 2GB+ cards provided they have the power to use all of it effectively, or those new geforce PALIT 580's with 3GB VRAM each.

However, 1.5GB is still a hefty amount and more than enough for your resolution on most games. Only those that have intense reflections that scale with resolution and have ****loads of variated, high quality foliage will give you trouble. And I don't know any games that combine the two as of yet.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by youra6 View Post
How do you measure your GPU usage? Through Afterburner? I would play Crysis with the AA/AF raised slightly, (ie: 2X/4AF) then again at (4X/16AF). If the VRAM usage surpasses 1.5GB and you see a noticeable drop in FPS, then you will know that the VRAM is your bottleneck.
afterburned

I thought if ran out of VRAM, it will simply crash to desktop or simply freeze.

That being said, BC2 gave me countless crash to desktop and do you guys have the same problem? I don't think it's Vram related.
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post #8 of 11
Quote:
Originally Posted by andynolife View Post
afterburned

I thought if ran out of VRAM, it will simply crash to desktop or simply freeze.

That being said, BC2 gave me countless crash to desktop and do you guys have the same problem? I don't think it's Vram related.
I was having the same issue with BC2. I contacted evga about it because I suspected the vram as well, as I hoveer 1060mb in the game. evga told me that if it maxed out the vram it wouldn't crash, just slow down or lock up. I did alittle more research and there is some issue with the game and high resolutions when your textures are set to high. I lowered mine to medium with 4x aa and 4x af and my CTD is gone
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post #9 of 11
Quote:
Originally Posted by andynolife View Post
afterburned

I thought if ran out of VRAM, it will simply crash to desktop or simply freeze.

That being said, BC2 gave me countless crash to desktop and do you guys have the same problem? I don't think it's Vram related.
No, basically if VRAM ever runs out, the system will try and fetch textures which are allocated in system memory. This will slow down performance since RAM is much slower than VRAM.

Never had BC2 crash on me. Driver related?
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post #10 of 11
Quote:
Originally Posted by youra6 View Post
No, basically if VRAM ever runs out, the system will try and fetch textures which are allocated in system memory. This will slow down performance since RAM is much slower than VRAM.

Never had BC2 crash on me. Driver related?
I know I wish mine was. I spent quite some time on the phone with EVGA trying different drivers, and different versions of the SLI enhancement with no luck.
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