OC Problems with 8800gts

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darkflames

Gawd
Joined
Dec 30, 2006
Messages
738
Ive been trying to overclock my evga 8800gts 320mb video card. I change the clocks using ati tool and at stock the clocks are 513mhz core and 1584mhz memory. I managed to get the clocks to 566 core and 1800mhz memory. I did the Scan for artifacts for 7 hours and didnt get anything and gpu temperature was at 78 celcius. I tried using the world in conflict beta video stress test with everythin on maxed and the average fps didnt change. Its also the same for 3dmark 06 too.
 
you said what you've tried and done so far...but perhaps you're just too flustered to realize you didn't tell us at all what the problems were.
 
well, I would certainly think so. However, I have no experience with the World In Conflict test. I would certainly think that your 3dmark06 score would have gone up, unless you're being CPU limited. Care to post your rig specs?
 
his system specs:

Intel e6400
2gb ddr533
evga 8800gts 320
BFG 650watt PSU
Samsung 200gb 7200rpm HDD
Acer 19inch Wide Screen

shouldn't be CPU limited at all, even at stock 2.13GHz on the E64. Screen can't be higher than 1440x900 (1680x1050 AT MOST), which is fine for a 320. Strange...I'm thinking we've got a driver problem (old revision) under Vista or XP64. Anyone else?

possibly, a Speedstep thing (not disabled), or video card is running in 2D mode. other possibility is running on a P5B or similar board that resets the primary graphics slot to x1 on occassion (got, I hated that bug!).

OP - please give CPU_Z screenshots of the General tab, Motherboard tab, and Memory tabs. Also, anything that shows GFX reference clocks, System properties General tab, and 3dmark06 v1.10 results. It's likely a simple issue, but all that would really help.
 
Im using xp pro, it was like this with two different drivers, the one currently out now for nvidia and the Current beta driver they have out.
 
4kmpp4p.jpg



My 3dmark score for 06 was about 8.1k.
 
8.1k sounds about right for a single GTS. Are you sure you applied your 8800 clocks before running your benches? I've done that before. You're using ATiTool or RivaTuner or something?
 
ya ive applied it i even downloaded riva tuner to make sure the clocks were applied and verified with another program. I will say when i overclock the card to the regular 8800gts superclocked speeds i get about 8.5k mabey but any higher the score drops or stays about the same.
 
darkflames said:
ya ive applied it i even downloaded riva tuner to make sure the clocks were applied and verified with another program. I will say when i overclock the card to the regular 8800gts superclocked speeds i get about 8.5k mabey but any higher the score drops or stays about the same.
Click to expand...

I don't have it anymore, but there's a chart that shows GPU core clock to shader clocks reference scaling, as you go up in core clocks. IIRC, there's a shader speed bump that correlated to every 54MHz of CPU core speed (I think that's right on the mhz). This is why you see the card speeds rated at all sorts of weird numbers, instead of nice round, marketable numbers like 650mhz gpu core. The game changed with the g80 architecture. This is also why you'll see almost no performance increase from one mhz to another, if the higher mhz speed doesn't also coincide with a shader speed clock increase as well. There's no longer a direct correlation between gpu core speed and the performance output.

Let's simplify. g80 has 3 clocks, GPU, Shader, and Memory. Memory is the only independant clock on the g80. Cpu and shader are tied together to a certain extent. GPU must be overclocked beyond a certain threshold (somewhere around 54MHz increase) to reach the next increase of shader clock speed. Without the increased shader clock speed, you'll see negligible perfomance increases...basically you're just creating more heat for zero performance. Until the shader clock reaches the next clock speed, your overall performance increases will be within the 5% margin of error, and arguably there is not a performance increase at all, until this next threshold is reached.

Perhaps you even at your initial overclock, your shaders hadn't stepped up to the next threshold, resulting in no performance, and you were expecting some. You've got to hit that next shader clock level to see one, as you mentioned in the last post, putting the card at SC speeds gives you another 400 points or so...that's your next shader clock threshold kicking in to help the performance.

fbmbikes...STFU
 
Hey.. I have a VERY similiar setup.. I just ran 3dmark06 today as I just finished installing my wife's parts into her computer yesterday. Here is a run down of her setup..

Intel E6420 (stock 2.13ghz but its overclocked to 3.4ghz)

EVGA 650i Ultra motherboard

2gb of GSkill DDR2-800 (red heat spreader) ram

Coolermaster Real Power Pro 850W Power Supply

Coolermaster Gemini II CPU Cooler

XFX 8800GTS 320mb video card (overclocked it with RivaTuner at 575/950)

I scored a 10,442 on 3dmark06. I think your score (and frames per second) can improve if its possible to overclock your processor, ram and video card, accordingly.

Your CPU is running at factory specs. That processor should be able to 3.0ghz without ANY vcore change. If you have some form of thermal throttling, I would disable it.

Your ram (bus speeds). What kind of ram is it (DDR2-800)? I would DEFINATELY increase your bus speeds. That will help out ALOT! A 375 FSB x your 8x multiplier would put you at 3.0ghz! Also, I'm not sure what kind of ram you have but be sure that your timings are manually set (not set to auto). With my GSkill ram, I have my timings manually set at 5-5-5-15 @ 2T @ 2.0vdimm. If your ram is capable, you should be able to run it 400 FSB x 8x which would give you 3.2ghz (I used the UNLINKED option). That automatically put me at a 1:1 ratio. Currently, I am at 425 FSB x 8x = 3.4ghz. I am idling at 29c and under Orthos, I am MAX'd out at 51c with both cores being stressed at 100% for a minimum of 1 hour. My processor is every bit capable of 3.6ghz (450 FSB x 8 = 3.6ghz) but when I stressed it under Orthos, my ram threw an error. So, it's important to know what your RAM is capable of or atleast knowing what you would consider a comfortable overclock.

If you need a little help or some input on your setup (since we have very similiar builds) let me know.. I know your setup is capable of more!
 
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