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GTX 550ti SLi dedicated memory

post #1 of 6
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Hi folks I am very new to this so i apologize in advance if my questions seem dumb

I just recently bought another graphics card for my PC to run SLi.

upon installing and setting everything up went smooth but what i don't understand is the dedicated memory is only 1024mb.
Isn't the memory suppose to be double.?

My friend is running Cross Fire X on his setup and his dedicated memory is doubled.

Also my frame rate is games aren't as High as i thought they would be with the 2 graphics cards.

I'm currently playing Battlefield 3 with almost Ultra settings.
I usually peak at 60fps but drops in between. its never steady 60 fp3

I tried other games like NFS Hot pursuit and during game play the frame rate is between 35 ot 45 fps.

Here is the rest of my hardware in my computer

Mother Board- EVGA 780i Sli
8gb DDR2RAM- G skill
Intel Core 2 Quad Q9650 Factory clock

Any help would be great
Thanks

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post #2 of 6
It doesnt double the ram, if the card is 512 and the other one is 1 gig they are both going run at 512.

As for ATI, it can say 2 gigs, but really each one is running together at 1GB.

Its to create a balance/harmony so they can run side by side without any major hiccups.
Edited by dlee7283 - 3/21/12 at 11:50am
    
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post #3 of 6
The memory is not doubled. It is only mirrored. This is how both SLI and CFX work.
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post #4 of 6
You're not going to run BF3 on ultra with less than a 1.5GB graphics card. It uses far too much memory.

SLI makes it so each card takes turns rendering a frame, so they can't share a pool of memory. You work with the same amount of memory in SLI. If one card has less memory for some reason, like a 2GB 560 and a 1GB 560, they both can only use the lower amount.

In battlefield 3, with my SLI 560s, I have tried everything to balance image quality and performance.

Use this settings:

Textures High (if the game has moments where it stutters or freezes for breif moments, go down to medium)
Shadows Medium
Terrain quality medium
Mesh quality high
Anti aliasing off
Post process anti aliasing High
motion blur off
anisotropic 8x
Ambient occlusion off

this is for 1080p resolution.

if you play at a lower resolution you should turn anti aliasing to 2x, or even try 4x and see how your performance is.
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post #5 of 6
Good advice on this thread.

To which I'll add that your friend only THINKS he has double the memory capacity in Crossfire ... actually he doesn't. It's just that the AMD driver API 'counts' the memory usage differently than the nV driver API does (and the application reading this info isn't correctly compensating for these differing calculation methods) which is leading to this confusion.

Assuming exactly equal gaming scenarios, wherein your cards are showing usage of, say, 800MB of vram (out of 1GB total) ... if you ran the same game/config on his PC ... it'd show that he's using 1600MB of vram (out of 2GB total, assuming he has 2 x 1GB cards) to do the exact same thing you're doing.

IOW, you'll both be using 80% of your total memory, because SLI and Crossfire both mirror the same set of data across the memory banks of each card in the multi-gpu array. All his numbers are double yours because AMD doesn't 'account' for mirroring effect by multiplying the 'total' memory usage by .5 (for two cards in SLI) like the nV driver does.
Edited by brettjv - 3/21/12 at 12:40pm
    
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post #6 of 6
Thread Starter 
Wow this helped me out a lot. Thank you guys very much for the helpful information. I assumed with the extra card would raise the frame rate in the game. Ill do some tweeking and let you know the results.
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