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What's holding my system back?

post #1 of 7
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Check out my sig rig.

I mainly just want to max out GTA IV but I'm still running into problems. If I put everything on "very high" its still kind of choppy, although it says I'm get 60fps? It's alot smoother if I pick auto configure.

Is it true that in SLI it only uses the memory on one card?
    
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post #2 of 7
Huh. Odd. I'd think your system could handle that with no problem. Looks fine to me.
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post #3 of 7
GTA IV, is in truth a okay optimized game engine. What resolution are you running at, and what are ALL of the settings in game. View distance, can kill any rig out there if it is set to high. I play the game a lot at 40FPS with no stutter, on everything very high, view distance set to about 22. Helped a lot performance wise.
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post #4 of 7
Quote:
Originally Posted by Daris1015 View Post
Check out my sig rig.

I mainly just want to max out GTA IV but I'm still running into problems. If I put everything on "very high" its still kind of choppy, although it says I'm get 60fps? It's alot smoother if I pick auto configure.

Is it true that in SLI it only uses the memory on one card?
I remember reading GTA IV make heavy use of vRAM, it was infact the only game which used the whole 2GB RAM fitted on my GTX 275, so vRAM may be the issue more than everything else. Even though you have SLI (raw processing power) you may have a limited amount of vRAM (1GB I believe).

Try cutting on AA a bit (which eats vRAM that you can't spare).
Edited by Mafia2020 - 4/14/11 at 2:17pm
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post #5 of 7
Mafia is correct, in SLI setups, the amount of usable VRAM does not double, each card/core only has access to its own memory. That said, 460s get murdered by high AA because of their lack of VRAM, even if they've got more than enough raw power to handle it.
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post #6 of 7
Yep, 2 cards still only the VRAM of 1... Although this is usually okay in resolutions up to 1080. Hummm... How about vsync? Have you tried enableing it maybe you are experienceing some tearing because of it?
    
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post #7 of 7
With GTAIV, it's the vram amount for sure. That game can be a huge hog of vram.

I dunno if dropping view distance in that game reduces vram usage or not, but it's worth a try. Also worth trying is using lower texture size/quality (whatever it's called), and don't use AA (does GTAIV even support AA?). The other option is to lower the resolution, which is the most effective way to cut down on vram usage.

In SLI the memory of all cards in a SLI set *is* used, however, because SLI works by alternate frame rendering (iow the cards 'take turns' rendering entire frames), the total amount of info that needs to be stored in memory gets doubled. This is because both cards need direct (i.e. on-board) access to all the information necessary to render the entire scene.

Thus, the 'effective' memory capacity for the SLI setup remains at whatever is present on a single card.

As a side note, you ever notice it takes way longer to load levels on an SLI setup than it does w/a single card? It's cause you're filling up two cards memory w/data instead of one.

Lastly ... if you run Afterburner you can fire up the onscreen display (OSD) and have it show you the vram usage while you're playing games. If you get up to around 1GB usage (the meter won't go over what you have), you're gonna take a perf hit.
Edited by brettjv - 4/14/11 at 3:01pm
    
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