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Does a stock i7 920 bottleneck a 5970?

post #1 of 8
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I always wondered why my CPU score was so low until I realized that for some reason it was running at stock, probably due to power going out once. A simple raise from 2.67ghz to 3.6(don't know why it's reading 3.4), raised my GPU score by a full 3400 points! GPU is the same running at 950/1150.



Edited by superbabosheki - 6/9/10 at 12:12am
    
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post #2 of 8
your cpu also helps in graphic processing thats why a faster cpu means better performance.
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post #3 of 8
What you notice is the faster calculations of the Physx test. You are having an ATI card which doesnt support Physx. So more gigahertz = more score
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post #4 of 8
a i7 920 stock might show better benchies but for gaming etc, ur fps would be the same, On the other hand though, if u had a ****ty cpu like a E8400 Then you would be bottleknecking big time..
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post #5 of 8
Big time bottleneck.

If you're primarily a gamer I would recommend turning HT off and clocking the chip higher. It will run cooler and give you a little extra headroom. Not only that, it is going to make your FPS go up a good bit. Going from 3.8ghz HT ON to 4.2ghz HT OFF even gave me a good fps increase. The only thing HT helps with is 3dmark, but if you actually want to play games HT OFF is currently the best solution.
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post #6 of 8
If we talk about benchmark result.
There are no CPU (at stock speed) out there which is not bottlenecking GPU.
Getting higher clock speed will increase the benchmark result. That's very normal. Don't look it as bottleneck or there will be no end about this bottleneck thing.
Even at stock speed, Core i7 won't be the one that holding back your GPU performance. CPU also take part in gaming performance. When you overclock the CPU to higher clock speed, it'll boost the part of CPU performance which simply leads you to a better result.
Sometimes you might hit a wall in FPS. But surely this things only happen when your FPS is already very high like above 100 FPS. There's no different in real visual performance when your FPS is already above 60. Only noticeable via benchmark. You shouldn't worried about this because it is not noticable.
    
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post #7 of 8
Quote:
Originally Posted by Bima Sylirian View Post
If we talk about benchmark result.
There are no CPU (at stock speed) out there which is not bottlenecking GPU.
Getting higher clock speed will increase the benchmark result. That's very normal. Don't look it as bottleneck or there will be no end about this bottleneck thing.
Even at stock speed, Core i7 won't be the one that holding back your GPU performance. CPU also take part in gaming performance. When you overclock the CPU to higher clock speed, it'll boost the part of CPU performance which simply leads you to a better result.
Sometimes you might hit a wall in FPS. But surely this things only happen when your FPS is already very high like above 100 FPS. There's no different in real visual performance when your FPS is already above 60. Only noticeable via benchmark. You shouldn't worried about this because it is not noticable.
Dude, if you get a higher GPU score (or FPS) by raising the CPU clock, then the CPU *IS* bottlenecking. On that test, at those settings.

It's really that simple.

Beyond that, it's just a question of how many frames in the particular test were rendered slower than what they could have been, and how much slower were they rendered than what they could have been, given unlimited cpu-power. These two calculations dictate the DEGREE to which cpu-bottlenecking is taking place, on the particular test, at the particular settings it was run at.

When you have a powerful multi-gpu solution like a 5970, cpu-bottlenecks are actually pretty common, both in benches and in games. The faster you can get your CPU, the better off you'll be. Especially when it comes to MIN framerates.

Quote:
Originally Posted by Drug View Post
a i7 920 stock might show better benchies but for gaming etc, ur fps would be the same, On the other hand though, if u had a ****ty cpu like a E8400 Then you would be bottleknecking big time..
Even in (some) games, with a 5970 and a stock i7, the performance will be noticeably more laggy than it would be with the i7 at like 4.0GHz. Certain parts of Crysis are a good example off the top of my head.

Also, an e8400 is NOT a crappy CPU by any stretch. There's truly not that much difference in gaming performance vs an i7 at equal clocks, EXCEPT on the few games out there than actually make use of >2 cores like GTAIV and a handful of others. I know this, because I used to have one and benched extensively when I first switched to an i7. Yes, it can be a bit slower, but a nicely OC'd e8400 it still a great gaming CPU, again, except in some rare cases.
Edited by brettjv - 6/9/10 at 9:57am
    
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
Big time bottleneck.

If you're primarily a gamer I would recommend turning HT off and clocking the chip higher. It will run cooler and give you a little extra headroom. Not only that, it is going to make your FPS go up a good bit. Going from 3.8ghz HT ON to 4.2ghz HT OFF even gave me a good fps increase. The only thing HT helps with is 3dmark, but if you actually want to play games HT OFF is currently the best solution.
Would clock higher but I have a REALLY bad c0 chip(I bought one of the first ones in the market). Tried everything to get it to a stable 4.0 but it just wouldn't go there. At 3.8ghz I can get it 24 prime stable, but it still randomly blue screened at times.

Thanks for replies everyone, +repped!
    
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