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Few questions about 560ti SLI

post #1 of 7
Thread Starter 
My original card was at 987mv and I ordered the same card (TFII) and it came with the same 880mhz but 1012mv. I turned them both down to 987mv, why is it higher? It also has a black metal piece on the top that my other card doesn't have, Is it that just for looks? Doesn't look like it does anything.

Also When I go to device manager it says that one is on 275.33 driver and the other 285 beta...should I full uninstall/reinstall drivers? Will it then install them for both cards?
Edited by infodump - 10/5/11 at 6:50pm
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post #2 of 7
I had the same with my two 560 Ti's from Gigabyte.

I found the one running at the lower voltage actually started causing artifacts after a while.

The second one running at 1.12v never had that problem, so I flashed the first one with the BIOS of the second one, no issue after that. Bear in mind my clocks are at 950mhz, though. (Super-overclocked at the factory).

The second card was actually a second revision from Gigabyte. My second revision also had a newer cooler on it, so I'm guessing your second card is also a second revision from MSI.

I'd recommend you driver sweep all of the nvidia drivers and do a fresh install of the BETA drivers (Assmuning you have them because you're trying out the BF3 BETA).
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post #3 of 7
Cards even from same vendor same line can vary in default voltage.

My EVGA GTX 580 SC came with 1.0880v and others I talk to have 1.0550v.

Not sure why the discrepancy but your cards are fine. You did the right thing by running them at same voltage and naturally clocks. Nothing to be alarmed about. smile.gif
     
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post #4 of 7
Thread Starter 
Thanks, I guess I'll leave em low unless I fail WU's or start getting artifacting, then I'll set them back to same as the new one. Played crysis for a while and it ran perfect biggrin.gif Little hot though...

So far 2 out of the 4 games I've played don't correctly support sli..is this a problem you run into this much? The witcher 2 runs both cards @ like 50-60% usage, and Rage just leaves the 2nd card @ 0%. (Yeah I know, consoles don't support 2 video cards why should rage?!)
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post #5 of 7
Quote:
Originally Posted by infodump;15201354 
Thanks, I guess I'll leave em low unless I fail WU's or start getting artifacting, then I'll set them back to same as the new one. Played crysis for a while and it ran perfect biggrin.gif Little hot though...

So far 2 out of the 4 games I've played don't correctly support sli..is this a problem you run into this much? The witcher 2 runs both cards @ like 50-60% usage, and Rage just leaves the 2nd card @ 0%. (Yeah I know, consoles don't support 2 video cards why should rage?!)

Rage being a console game actually has nothing to do w/SLI not working. I play TONS of console ports and SLI works perfect on all of them thumb.gif

The actual issue is that the drivers you're using just don't have an SLI profile for Rage cause it's such a new game. If you need the extra SLI performance, I'd check for beta drivers (check release notes to see if there's anything about Rage support), or just wait til the next WHQL set, which I'm certain will have added the SLI profile for Rage, then SLI will work.

AFA Witcher 2 goes, SLI is totally supported, it just has randomly low GPU usage in a certain areas when running SLI. If it wasn't you'd get 0% on the 2nd card, like you do in Rage.

It's gotten better over time w/patches and driver improvements though, and generally the game runs really well at max settings (no uber) and only occasionally dips down into the 30's when in 'camps' with tons of NPC's and firepits and stuff. At these times GPU usage also falls.

I'm pretty certain that it's a cpu bottleneck causing low GPU usage in these specific areas. Lots of NPC's = lots of extra calculations. Fire/smoke also takes a lot of computation power. And I believe that Witcher 2 only makes full use of 2 cpu cores, so that doesn't help the situation.

But any time you have <99% it can also just be a bottleneck that's internal to the card ... memory bandwidth or pixel fillrate could be getting tapped out, for example. Remember GPU usage is just measuring one subsystem of your card, not the entire thing. So lower than 99% gpu usage can be caused by bottlenecks both external (cpu/platform) OR internal (memory bandwidth, fillrate, etc). It can also be caused by driver glitches with the particular game (perhaps causing excessive texture swapping within the vram, or back and forth w/system memory) .

Bottom-line you can drive yourself batty worrying about why you're not getting 99% gpu usage ... and you can save yourself many many hours of wasted life by NOT worrying about it, beyond OC'ing your CPU as much as possible to help remove the most common source, and keeping your game patched and drivers up to date. Using highest possible settings usually helps as well, but not always due to possible internal bottlenecks like I was talking about above.

Also remember that any type of framerate cap (such as using v-sync, or caps built into the game itself) can cause <99% usage ... the reason for this should be obvious if you think about it wink.gif
Edited by brettjv - 10/6/11 at 9:41am
    
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post #6 of 7
Thread Starter 
Thank you for the big explanation biggrin.gif All makes a lot more sense now. Yeah I turned off uber on the witcher and now I get 50-60fps, I was running 10-15 and hitting 50% gpu usage so I was not happy. I was just being sarcastic with Rage, it's just horribly horribly buggy from everything I've seen.
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post #7 of 7
n/p info.

I get the exact same thing when i turn on Uber ... both low FPS, AND low gpu usage. I think it just taps out one of the card's subsystems (my suspicion is memory bus) so bad that the core (where the usage measurement is taken) ends up not being fully utilized. Using up all your vram can do the same thing, too ...

Basically there's lots of parts of one's system where a BN can occur when gaming, resulting in <99% usage ... it can sometimes be really frustrating if you're getting lag, and your card says it's only at 50% usage ... but like I say, you're not measuring your entire card there, just one part of it. Another part of the card might be the source of the BN, or it can be the cpu/platform. And you can save yourself a lot of headache and time by just accepting and hoping nV or the game maker fixes it ... it's almost never a sign of something being broken, nor something you can 'fix' ...
    
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