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How important is video ram?

post #1 of 21
Thread Starter 
The higher the resolution the higher amounts of textures you need and the more ram u need?

am in debate where 2Gb on the 4870x2 is better than the 1GB cards?
Edited by ollie007 - 2/15/11 at 1:55am
post #2 of 21
i think thats the general jist of it but dont quote me on it ^^
post #3 of 21
The 4870 x2 only has 1gb available for texture memory. It physically has 2gb, but it's two "cards" in crossfire. When you crossfire cards, you don't get to add the second cards texture memory, as both cards need to store all the textures separately in each cards memory.

Long story short, any x2 card will generally have the same amount of memory as it's single card counterpart.

Unless you're talking about a "2gb total" 4870x2 vs a "1gb total" 4870x2, then you would have 1gb memory available on the first one, and 512mb on the second.
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post #4 of 21
for dual GPU cards
if it says 2GB total VRAM
that likely means 1 GB VRAM per each GPU as textures etc have to be mirrored on each induvidiual GPU's memory
post #5 of 21
Theres plenty of 512mb graphics card better than my 1GB HD4650, memory should not matter unless its low memory like 128mb or 64mb etc.
    
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post #6 of 21
Quote:
Originally Posted by jdcrispe95 View Post
Theres plenty of 512mb graphics card better than my 1GB HD4650, memory should not matter unless its low memory like 128mb or 64mb etc.
actually it does once you jack up AA/AAF and resolution
post #7 of 21
GPU memory is becoming more and more important as top end cards are getting more and more powerful. If you want to run high levels of AA/AF at high resolutions, especially on multi-display setups, then you start needing memory levels up to 3GB per card.
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post #8 of 21
Quote:
Originally Posted by Mr.Pie View Post
actually it does once you jack up AA/AAF and resolution

Thats what I said... if you have a low memory card and you want high resolution with AA you're going to have to choose something with more memory..
    
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post #9 of 21
Back in the day, when I was first building PCs, to display SVGA @1024x768 you needed 1MB of RAM allocated to video.

Nowadays it still does take only a few MBs to display at whatever resolution you may have, the thousands of MBs left at for AA, AF, SSAO, framebuffers etc.
(I may be wrong, but don't quote me...)
Edited by t0adphr0g - 2/15/11 at 2:48am
post #10 of 21
For 1920 x * there is no reason to have more than 1GB, when you start with 2560 x *, VRAM really makes a difference.
    
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