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Fermi Tessellation Performance Comparison - Page 9

post #81 of 105
Quote:
Originally Posted by brettjv View Post
I don't think clocks come into play here because the tess units are obviously being OC'd at the same rate as the core, and the OC scaling for them looks to be the same.
Based on testing at several different clocks, the difference was virtually the same, so I'd say that theory is right.
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post #82 of 105
Quote:
Originally Posted by KonigGeist View Post
My 580 was running at stock then, but it had a glitched BIOS, so those aren't normal numbers. Running it several times in the past day or two, after fixing the BIOS, I've been getting around 50-55 on extreme, however the percentage lost has remained the same.
But I agree that I Kepler needs to be more of an upgrade
50-55 same settings, 1080p ? Seems unlikely, on the same page 3, ACHILEE5 posted his GTX 480 results at 760MHz and I don't see how a 580 would manage 50-55 FPS vs 36 FPS.
post #83 of 105
Quote:
Originally Posted by Wulfgar View Post
50-55 same settings, 1080p ? Seems unlikely, on the same page 3, ACHILEE5 posted his GTX 480 results at 760MHz and I don't see how a 580 would manage 50-55 FPS vs 36 FPS.
Here are a few runs, one from yesterday and one from just now. As far as I can tell, I got the settings the same.

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post #84 of 105
These are the settings I used
Just changing the tessellation!



results


The Prodigy's GTX570
Using the same drivers as me 275.33

Edited by ACHILEE5 - 8/3/11 at 8:14am
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post #85 of 105
Quote:
Originally Posted by KonigGeist View Post
Here are a few runs, one from yesterday and one from just now. As far as I can tell, I got the settings the same.
You get different results with same settings? Actually there is something unstable in your computer either your GPU or your CPU.
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post #86 of 105
Quote:
Originally Posted by HeadlessKnight View Post
You get different results with same settings? Actually there is something unstable in your computer either your GPU or your CPU.
He kept everything the same but went from tess off, tess norm, and tess extreme.

There is one variable you gentleman have forgotten, does tessellation bottleneck the GPU and the CPU? You guys would have to remove the CPU from the variable equation (high/stable overclocks.) The drivers still have to communicate with the CPU for the most part, have any of you guys tested increases CPU frequency to compensate for the extra levels of instructions having to be processed? Perhaps even adjusted inter-system communication such as QPI frequency / Uncore frequency. Boosting those at times can prove more effective then raw CPU speed.
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post #87 of 105
Quote:
Originally Posted by RagingCain View Post
He kept everything the same but went from tess off, tess norm, and tess extreme.

There is one variable you gentleman have forgotten, does tessellation bottleneck the GPU and the CPU? You guys would have to remove the CPU from the variable equation (high/stable overclocks.) The drivers still have to communicate with the CPU for the most part, have any of you guys tested increases CPU frequency to compensate for the extra levels of instructions having to be processed? Perhaps even adjusted inter-system communication such as QPI frequency / Uncore frequency. Boosting those at times can prove more effective then raw CPU speed.
I think CPU could become a factor in the no (or possibly the normal) tessellation tests if you're running high-end SLI and don't have at least a Bloomfield at 4.0GHz. In my experience Heaven will *start* to exhibit some signs of CPU BN at around 80fps, and will 'cap out' at around 150fps no matter how low I put the settings (iirc ... haven't tried in quite awhile).

Thus, I think if you were running like SLI 580's on a q6600, you'd end with with a very low perf hit from switching to extreme, because your 'no tess' run would be significantly dragged down due to the CPU speed. The extreme run ... much less so, due to the fact that you're shaving 30% off of the FPS, and hence lowering the probability of the CPU acting as limiting factor to performance.

However, so far nobody has turned in any wild outliers (like an uber-low 25% performance hit), so I don't think that (so far, at least), the CPU on anyone's rig is coming in to play to any substantial degree. Plus we've had people testing single-card vs. sli and coming up with the same % perf hit, which suggests that (at least on their rigs), the CPU isn't impacting the results.
Edited by brettjv - 8/4/11 at 9:51am
    
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post #88 of 105
I just did three runs at "normal Tessellation" at different CPU clocks
3.4GHz 4.3GHz and 4.5GHz
Using both my GTX480s in Sli!

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post #89 of 105
Quote:
Originally Posted by ACHILEE5 View Post
I just did three runs at "normal Tessellation" at different CPU clocks
3.4GHz 4.3GHz and 4.5GHz
Using both my GTX480s in Sli!

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post #90 of 105
I'll do a pass thru with mine in SLI mode and post results in a bit.
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