Slower 3dmark06 after overclocking, why???

theoldtannery

theoldtannery

theoldtannery

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26 Jan 2008
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19
Location
Leicestershire
Hi,
Have got my Q6600 running at 460 FSb @ x7 to give 3.24MHz and it is rock solid on Orthos for 12 hours. I then started to run some graphics benchmarks to start on the GPU overclocking but have come across a very strange effect where the results are as below:

CPU FSB Mult Memory GPUBus GPUmem 3dmark06 3dmark06CPU
3.0 333 9 1066 650 972 13907 4784
3.0 333 9 1066 794 1074 15093 4867
3.23 460 7 920 650 972 4908!!! 5090

Basically i seem to be getting about a quarter of what I would expect. I cannot understand what can be happening to the graphics card that is keeping its frame rate right down when the FSB and CPU are rock solid. The CPU parts of the test seem consistent with the increase in FSB and CPU speed but the rest do not. Has anyone any ideas? The graphics card is running at stock speeds in theory and can only benefit I would have thought from the high FSB allowing 1:1 access to memeory at 920MHz. I guess there must be some other aspect of this speed FSB that affects the graphics card but I cannot understand what. I have not set any particular voltages other than Vcore as it was not necessary to do so for a stable system. Is it possible that an increase in voltage on some other parts of the hardware is required in order to drive the graphics correctly?

To get this overclock the settings are as below.

Vcore 1.3875
DRAM voltage 2.2v
CPU voltage damper Enabled
FSB 460
Multiplier x7
DRAM timings 5-5-5-16
The rest are on Auto generally.

Spec of machine is
P5KC Bios 0903
Q6600
Nvidia 8800GTS 512
Zalman CNPS 9700NT
Crucial Balistic 8500 5-5-5-15
Coolermaster extreme power duo 650W

Help would be greatly appreciated.

Thanks
 
Your PCIE slot is still running at 16x at that FSB is it?

I remember with my old P5B Deluxe, if I pushed the FSB up higher, it would clock my PCIE 16x slot down to 1x and cripple my scores! Have a look in CPUZ, is should tell you what its running at.

I might be miles off with that theory though, but it might be worth a check anyway! :)
 
Thanks for the quick response. I can't offhand remember what CPU-Z showed so i will check when I get home. I have had the PCI-E speed set to auto and to 100 but no difference. Is there another bios entry that controls whether x16 or x1 do you know?
 
theoldtannery said:
Thanks for the quick response. I can't offhand remember what CPU-Z showed so i will check when I get home. I have had the PCI-E speed set to auto and to 100 but no difference. Is there another bios entry that controls whether x16 or x1 do you know?
Click to expand...

I didnt think that was alterable, apart from by changing jumpers on the mobo.

Something may be throttling due to heat?
 
I don't think this is heat related as it is the same from cold start or from warm. Current temperatures at end of 12 hour orthos run are about 59 for each core based on CoreTemp and low 50's from Asus Probe for the CPU. Graphics card is comfortable with fan at 100% and temp of mid 50's under load. It does seem like some form of throttling due to an effect as a result of overclocking.
 
Hi,
Have now checked with GPU-Z and you are right, it gets set to x1 instead of x16 at this FSB. I then reduced the FSB down to 385 before it would get set back to x16. I also dropped the multiplier just to make sure the CPU was kept very low and was not the cause of the problem.
While I was still at 460 FSB I tried a few other things with voltages ending up with the following:
FSB 460
Multi x 7
mem 920MHz
Vcore 1.45v
Northbridge Voltage 1.55v
FSB termination voltage 1.22v

Even with all this it would still not allow x16 PCI-E. Dropping the FSB down to 400 had no effect either.

So, what is the route cause of the system deciding that any FSB above 385 cannot use the PCI-E at x16?? Many many people are getting high FSB's and high clock rates, surely they are not also all reducing their PCI-E speeds, I assume they would have noticed that. There must be something else I am not doing that is stopping it.

Does anyone have any other suggestions?

Thanks again for help so far.
 
I have been updating the thread below concerning my PCI_E x1 issue. Please look there for any future updates.

Overclockers UK Forums > Hardware > Motherboards
**- Official Asus P5K Thread -**

Thanks guys
 
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