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Need I upgrade to i7 ? update: YES! WE SHOULD! - Page 2

post #11 of 22
Thread Starter 
Quote:
Originally Posted by XXXfire View Post
The problem of low GPU usage, more often than not, can be reduced to a small handful of causes. The first: CPU bottleneck, which becomes painfully apparent in multiple GPU configurations with "antiquated" chips. Sometimes misinterpreted as the aformentioned is poor driver optimizations (probably manifested as outdated catalyst/forceware updates), and as a case in point the initial Eyefinity drivers running off multiple 5870 cards. It was common to have GPUs connected to top-end Nehalems seeing teens to twenties performance though everyone knew these performance scenarios were GPU limited, not vice versa. Finally, PCI-E bandwidth saturation can result in negative scaling type results (i.e. 3 cards functioning at low percentages), though I've personally only seen this on ***** P55 motherboards with a third PCI-E x16 tacked onto the platform control hub's generation 1.0 x4 lanes (which also is shared by the chipset sata II, ethernet, et al.)

The reason you're getting 100 percent usage in certain benchmarks is specific to the way benchmarks are coded. It doesn't mean that, because you've seen near maximized GPU utilization in one evaluation (benchmark whatever), since other software demonstrates far poorer performance comparatively, the performance deficit is because of an intrinsic flaw in AMD's drivers, crossfire scaling, and so forth.

In ATI's VLIW-5 architecture, the so-called t-unit was devised and implemented when DirectX 9 & vertex shaders kept the widest SP occupied. Transcendental operations (accounting for a dramatically higher proportion of overall code when the architecture was fresh) have become less often utilized from year to year, such that essentially 1/5 of the units are, on average, sitting idle.

The point being, benchmark software like Vantage, 3dmark 06 and whatever optimize software to, in a sense, achieve a higher performance result than ever would happen in the context of..well, reality, by utilizing shaders that more often than not are remaining idle in games.

Upgrade to an i7. It'll resolve all the problems noted here, & the shift in performance is night & day difference
deep insight, thank you
post #12 of 22
Thread Starter 
after upgrading to i7 950, all annoying problems are gone, below is the BC2 test result on i7 950 5870CF and 5870

i7 950 default clock+ 5870CF default clock:



you see, now GPUs' usage are around 100%









BC2 limits the max fps to 200fps, damn







post #13 of 22
Thread Starter 
btw: with Q6600 3.6GHz, the fps of both 5870CF and 5870 at the scene with a knife in hand are around 63fps, the avg fps of 5870CF and 5870 in the SP start animation are almost the same.
post #14 of 22
Thread Starter 
Dirt2 1680x1050 4xMSAA UltraPreset:banana:

compared with lower fps of 5870CF than 5870 at 1680x1050,















Dirt2 1920x1200 8xMSAA UltraPreset:banana:









post #15 of 22
Quote:
Originally Posted by Electroneng View Post
That actually is not true with the latest cards!

The HD6800 series scales almost at 100%

The HD6900 series are close to 90%

GTX 500 series are at 85%

All are much better then the scalability of the HD4000 series

All the top graphics cards will experience some bottleneck with a Q6600, even with a Q9550.
They need more CPU power than RADEON cards.. and thats why they scale like crap in tri SLi; even i7 980x bottlenecks like crazy sometimes
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post #16 of 22
Thread Starter 
F1 2010, the worst game for Q6600 3.6G+5870CF, the avg fps is 6-7fps lower than a single 5870, now:

1680x1050 4xMSAA Ultra













1920x1200 8xMSAA Ultra







post #17 of 22
Thread Starter 
Crysis 1.2

1680x1050 4xMSAA Ultra DX10











1920x1200 8xMSAA Ultra DX10









post #18 of 22
Thread Starter 
At last I know Q6600 3.6GHz is actually the bottleneck for these games,now I'm satisfied with the GPUs' usage in thses tests. Now I go for some overclocking on my CPU.
post #19 of 22
Hi guys,

I have been struggling to get more than 50% usage out of my 5870's playing MWLL which is a mod for Crysis Wars. Running my sig rig I get this

1980x1080 no AA - gets about 30-50 FPS



1980x1080 16xAA - no real change in FPS



6048x1080 no AA - around 20FPS with frequent lock ups under zooming




Any ideas where I am getting the drop in GPU usage. V-sync is off in all cases.
    
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OCZ Agility 3 Hitachi Deskstar ASUS DVD-R/W 1xEX480, 2xMCR420XP, 2xDDC-1+ 
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post #20 of 22
? make your own thread?
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