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Lower than desired gpu usage in Crysis 2 compared to "before". - Page 2

post #11 of 16
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Quote:
Originally Posted by Jesse^_^;14458790 
Fixed wink.gif

As it continues frown.gif
Quote:
Originally Posted by ilam3d;14458834 
Try new drivers, and while i don't think you NEED to OC your cpu, it might fix it.

I haven't checked in a long time, but to get 100% utilization on both of my cards (GTX 470) i needed 4.1Ghz with my 2600K when running certain games. And CPU utilization wasn't even 50%.

I see you're having GPU usage drops in BC2, it was "sort-of" like that when my cpu wasn't oc'd... I doubt C2 is that unoptimized though, but whatever works... works. I suppose these games don't really care about how many cores you have or what can they do, they care about how fast they can do whatever function the game assigns them.

That's bad CPU optimization in my opinion.

Protip: With no problems whatsoever you should be able to keep a 98% GPU utilization across the chart. 99% would be the best case scenario.

CPU is running 4.8GHz - Actual usage while gaming hovers around 50%, I dunno if they cut off the 3rd core or what exactly is going on there. Where it was using all of two, and some of a third before now it seems to be restricted to two cores like Crysis.

Oh well I'm making too big of a deal out of it anyways thumb.gif

Dragon Age II seems to have the same issue pretty much, while The Witcher 2 with Ultra preset pretty much crushed them down to 99% on both cards for 50-60~ fps.
    
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post #12 of 16
Quote:
Originally Posted by BallaTheFeared;14458850 
As it continues frown.gif



CPU is running 4.8GHz - Actual usage while gaming hovers around 50%, I dunno if they cut off the 3rd core or what exactly is going on there. Where it was using all of two, and some of a third before now it seems to be restricted to two cores like Crysis.

Oh well I'm making too big of a deal out of it anyways thumb.gif

Dragon Age II seems to have the same issue pretty much, while The Witcher 2 with Ultra preset pretty much crushed them down to 99% on both cards for 50-60~ fps.

4.8GHz should be more than plenty for any Graphic card setup... Therefore i give up. Try the usual driver swapping, it's most likely that, or some weird program being mean in your computer.
post #13 of 16
Welcome to my life Balla biggrin.gif

Low GPU Usage is the bane of my existence frown.gif

I have exactly what you are describing in about 1/3~1/2 of my games. Few exceptions like 3DMark11 and Call of Duty 4 work fine (95~99% GPU Usage.)

I anticipate this is the work of SLI Profiles.
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post #14 of 16
Yeah, I hear ya RC ... I posted a thread a couple of weeks back talking about how I wished they'd never added 'gpu usage' as something you could monitor. It can be REALLY mad.gifconfused.gifmad.gif when you're getting bad fps and lower than optimal GPU usage at the same time. Bane of my existence? Not sure it's that bad, but ... yeah. I get that problem fairly regularly as well.

A lot of times it's going to be a cpu bottleneck, but by no means is that the only possible cause.

It can be ANY type of bottleneck, even a BN within one of the card's physical subsystems like the memory bandwidth or memory amount or the ROP's are over-burdened.

It can also happen because of excessive texture swapping between system ram and vram, or within the vram itself. Or so I've been told by a 3d game programmer that rents an office at my building who I chat with often.

Many people (myself included, until recently) believe that 'the way it works' with textures is that your card's vram is first filled with textures, then only when your vram is 'full' you start storing textures in system ram.

But I have it on her good authority (and this girl is a coding ninja, no joke) that this is not actually the case, that with many games you will end up with textures in the system memory as well no matter what, and occasionally the fetches to them may slow your gaming down. Most of the time the drivers will do a good job of pre-fetching needed textures from system down to vram to avoid lag when they're needed, but not always.

Again, I'm just passing along what a game programmer at my office told me. She also said that textures often need to be swapped WITHIN your vram, like moved from one bank or address to another, and that if excessive texture swapping within the vram is occurring at a time when a lot of fetches also need to occur, you could get a bottleneck from that.

It can also happen on more of the 'software' level, like you could be experiencing excessive 'cache misses' where the core is having to go out to the vram to 'get stuff' too often ... you see, although the connection between your core and vram is very very fast, it's not as fast as having stuff actually in your cores cache, and too much fetching from vram can slow your card down. Basically, drivers aren't perfect, and certainly not every game is well-coded, so ... low GPU usage can *totally* just be a software problem, bad interaction between driver and game code.

So, something it helps me to think about when this crops up is ... that is the NOT the 'gpu usage' of your entire card. It's the usage of one part, one subsystem on your card. Presumably it's based on registers in the core, just like it's done with CPU usage, but I dunno for certain the methodology.

If true, to me, this would imply that 'usage' is actually measuring your cards 'mathematical calculation' burden ... i.e. < 99% 'usage' really just means that your card has calculation ability to spare ... but not everything that the card as a whole does in rendering frames is mathematical calculations ... hence, the taxing of the core's calculation ability is not the only possible 'source' of a bottleneck.

But in any case bottom-line what I'm trying to convey is: because 'usage' is not really measuring the whole card, it's entirely possible that SOME part of your card (texture fill, pixel fill, memory bandwidth, ROP's) ... is truly being maxed out. But the one subsystem where the 'usage' is being measured ... is not. Or, it could be an external type of bottleneck, like the CPU.

Or, like I say, it can just be the drivers/game, and in this case, it may get fixed eventually.

I dunno if that makes you feel any better, but it helps me a bit with the frustration level thumb.gif
Edited by brettjv - 8/4/11 at 9:28am
    
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post #15 of 16
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Does any of this information help you figure out which is what brett?

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post #16 of 16
ok sorry for the off top but i play mw 2 like 5 minutes and my pc turns off for no reason, my gpu temps are 75, i cant understand why is turning off
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