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Q8200 Gflops

post #1 of 5
Thread Starter 
Never mind, I left the CPU on the bed after taking a pic. The dog chewed on it, it be dead...

Hi there,

I'm having a bit of a problem with my CPU. I overclocked it to 2.8Ghz @ 400x7 (12 hours Prime stable) and I'm getting the same G flops as 333x7. I'll illustrate with a snapshot of a few tests I did with Passmark. Check attachment below.

As you can see the multiplier influences the FPU and Integer Math, although all the others scale remarkably well.

In LinX my G flops at the same clock speed are influenced by the multiplier of the CPU. For instance @ 2.4Ghz. 400x6 Gets 25 Gflops. Yet 343x7 reaches 29.5 Gflops.

Does anyone know why this is ? Is this just a hardware limit on the CPU related to the multiplier ? Either way I'm upgrading the CPU soon so this is just to become wiser in the intricate workings of a CPU

Thanks in advance !


UPDATE:

According to Intel the CPU should reach 37Gflops at stock, I've never reached that amount on any mobo (even with different RAM sticks). Something is definitely wrong here.

http://www.intel.com/support/process.../cs-023143.htm


UPDATE 2: Uploaded pic of CPU. Doesn't look damaged, judge for yourself. Crappy cam. I know.



Edited by Xenthos - 3/12/11 at 9:20am
post #2 of 5

Seems like something is unstable. Either that or something is slowing it down.
    
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post #3 of 5
Thread Starter 
I concur, I'm going to run memtest and later check the BIOS rom.
post #4 of 5
Quote:
Originally Posted by Xenthos View Post
Hi there,

I'm having a bit of a problem with my CPU. I overclocked it to 2.8Ghz @ 400x7 (12 hours Prime stable) and I'm getting the same G flops as 333x7. I'll illustrate with a snapshot of a few tests I did with Passmark. Check attachment below.

As you can see the multiplier influences the FPU and Integer Math, although all the others scale remarkably well.

In LinX my G flops at the same clock speed are influenced by the multiplier of the CPU. For instance @ 2.4Ghz. 400x6 Gets 25 Gflops. Yet 343x7 reaches 29.5 Gflops.

Does anyone know why this is ? Is this just a hardware limit on the CPU related to the multiplier ? Either way I'm upgrading the CPU soon so this is just to become wiser in the intricate workings of a CPU

Thanks in advance !


UPDATE:

According to Intel the CPU should reach 37Gflops at stock, I've never reached that amount on any mobo (even with different RAM sticks). Something is definitely wrong here.

http://www.intel.com/support/process.../cs-023143.htm


.
Make sure you use Performance Level at Manual and select same PL for both FSB setups. If at Auto it will probably be higher when at 400FSB. And you will loose mem performance, which affects the Gigaflops.

If running FSB:Mem 1:1 you should try Performance Level 10 for both. Also make sure you have enough Volts for NB at 400FSB. Should not need much more than 1.2 Volts with that P43 chipset.
    
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by turrican9 View Post
Make sure you use Performance Level at Manual and select same PL for both FSB setups. If at Auto it will probably be higher when at 400FSB. And you will loose mem performance, which affects the Gigaflops.

If running FSB:Mem 1:1 you should try Performance Level 10 for both. Also make sure you have enough Volts for NB at 400FSB. Should not need much more than 1.2 Volts with that P43 chipset.
I'll give it a shot, just to be sure that I did it right before but, NB was at 1.23v so that should be okay. FSB : DRAM is at 5:6 and Perf 7. Also, I'll upload a few pics of the chip, it doesn't look damaged, but just to be sure.

EDIT: Nyea, I would've tested it, if the dog didn't freaking... bite in the back of the CPU...
Edited by Xenthos - 3/12/11 at 9:16am
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