i knew i should have gone past post number 2
i know hes having problems with his overclocked card giving him only 80% usage
but that could just be down to him overclocking and problems with that been unstable for instance
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CPU bottleneck ?`
- Thread starter jonnyp1993
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i knew i should have gone past post number 2
i know hes having problems with his overclocked card giving him only 80% usage
but that could just be down to him overclocking and problems with that been unstable for instance
Soldato
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Getting a bit fed up with the name calling and obvious bad feeling with certain members in this section of the forum. Spoiling it for me I'm afraid, was entertaining at first but it seems if anyone disagrees with them well........
Caporegime
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Getting a bit fed up with the name calling and obvious bad feeling with certain members in this section of the forum. Spoiling it for me I'm afraid, was entertaining at first but it seems if anyone disagrees with them well........
Sorry, but misinformation needs to be squashed.
I'm not biased, I have absolutely no reservations about mentioning the bottleneck you have already in some situations.
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Can you test on something other than BF4 its a horribly un-optimised and bugged game right now and frankly all results will be screwed by that fact. Give it a few patches, and a driver update or two then you might find everything is golden.
However since BF3 is now mature, and quite decently optimised it will give you a better representation of how your system is working.
However since BF3 is now mature, and quite decently optimised it will give you a better representation of how your system is working.
OP run the game with vsyn off, check your cpu usage at max cpu and gpu clocks.
If the cpu is less than 100% then its not a cpu restriction. But if at max game settings you get less than 100% gpu in ultra with 4xmsaa in a 64 man server then you are likely cpu bottlenecked.
When I ran a 3750k with a single Hd7950 at 1200Mhz I was using 75% cpu and 99-100% gpu, 45-80fps.
Unless the AMD is aweful you should not have a BN with one card.....
If the cpu is less than 100% then its not a cpu restriction. But if at max game settings you get less than 100% gpu in ultra with 4xmsaa in a 64 man server then you are likely cpu bottlenecked.
When I ran a 3750k with a single Hd7950 at 1200Mhz I was using 75% cpu and 99-100% gpu, 45-80fps.
Unless the AMD is aweful you should not have a BN with one card.....
Caporegime
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Your CPU doesn't have to be 100% to have a bottleneck, the i5's aren't 100% when bottlenecking 7950/7970 Crossfires in BF3.
But if the GPU isn't 100% and you've got Vsync off, unless it's something daft like a VRAM bottleneck, then you've been bottlenecked, likely be the CPU.
The FX6300 is far from awful, but it's a 90 quid CPU, 7970's were flagship GPU's.
But if the GPU isn't 100% and you've got Vsync off, unless it's something daft like a VRAM bottleneck, then you've been bottlenecked, likely be the CPU.
The FX6300 is far from awful, but it's a 90 quid CPU, 7970's were flagship GPU's.
The OP has a 7950
Caporegime
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I know, there's also someone with a 7970.
At the same clock, the real world difference between a 7970 and 7950 is quite small unless you're playing firestrike all day.
These are still high end GPU's with a mid range CPU.
Caporegime
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What games, is Vsync on? Are you sure your CPU isn't just throttling? As you shouldn't really be bottlenecking a 7850, unless you play specifically low threaded but CPU intensive games.
Soldato
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I have something similar to analyse too nikki. My crossfire 7770's dont run 99% as others are expecting playing BF4 yet my CPU is only averaging 70-80% usage on all cores. Is it just the game or am I not pushing the cards hard enough?
110 percent cpu bottlenecked but it will still get decent perfromance oc. if your game is fine then dont worry. your cpu will bottleneck any card upto about a 7850/6970. they are about perfect cards for your cpu balance wise.
oc 7950 or 7970 is upto half as fast again as those cards. so you do need a faster cpu if you want the full performance. if you getting 90 percent of the performance and thats fine what does it matter?
oc 7950 or 7970 is upto half as fast again as those cards. so you do need a faster cpu if you want the full performance. if you getting 90 percent of the performance and thats fine what does it matter?
Caporegime
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Bottleneck doesn't spell the end of the world.
But people just flat out pretend it's not there.
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Soldato
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Guffaw.
Similarly, if people now have 7990's to test with I'm sure we can work out what card does actually bottleneck the FX83 if at all..
I was thinking a 260 would compliment it well. I didnt realise two 7770's are not far behind a 7950 meaning only a card around the 7970 (or better) is a worthwhile 'upgrade'.
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I believe the reason the CPU can read 80-90% and still be bottlenecking is because of how many components are actually packed into the CPU (integer cores, floating point units, cache, IMC)...
We should all know that AMD's memory controllers and cache are pretty weak, and given the FPUs are shared by 2 integer cores it is conceivable that whilst the integer/logical cores are only running at 80% one of the other components is bottlenecking.
It would be hard to test, but if you try clocking the NB / HT higher it may produce a different picture.
I think in poorly threaded apps it is unlikely the FPU would bottleneck before the integer/logical core was maxed - given that for each module the FPU is (relatively) much more powerful than a single integer core.
I used to get the same effect on sandybridge. For instance on NS2 I'd run at around 80% on a single core (around 20% GPU usage as it's a GPU light game), and get FPS drops / stutter still. I thought it was probably due to a memory bottleneck but never bothered to test.
We should all know that AMD's memory controllers and cache are pretty weak, and given the FPUs are shared by 2 integer cores it is conceivable that whilst the integer/logical cores are only running at 80% one of the other components is bottlenecking.
It would be hard to test, but if you try clocking the NB / HT higher it may produce a different picture.
I think in poorly threaded apps it is unlikely the FPU would bottleneck before the integer/logical core was maxed - given that for each module the FPU is (relatively) much more powerful than a single integer core.
I used to get the same effect on sandybridge. For instance on NS2 I'd run at around 80% on a single core (around 20% GPU usage as it's a GPU light game), and get FPS drops / stutter still. I thought it was probably due to a memory bottleneck but never bothered to test.