Frame rate boost with 9800pro by increasing CPU's Vcore - How come?

U

Ulf Stahl

My somewhat overclocked system was/is running stable. No crashes, no
artifacts.
Mobo A7N8X Deluxe Rev 1.06, Bios 1007, 1 G RAM (2x512 MB Kingston HyperX)
XP 3000+ @ 2355 MHz, Vcore 1.750 V
Radeon 9800pro 128 MB @ 441 / 351.
When I increased the Vcore to 1,775 V (letting everything else unchanged) I
got a considerable boost in frame rate,
measured with the FRAPS utility when gaming IL2-FB (OpenGL).
I had this with Cat 4.1 and now Cat 4.2 drivers.

Didn't know there was a connection between CPU-Vcore and FPS.
Can somebody explain this phenomenon, pls?

TIA
Uffe
 
S

Stephan Grossklass

Ulf said:
My somewhat overclocked system was/is running stable. No crashes, no
artifacts.
Mobo A7N8X Deluxe Rev 1.06, Bios 1007, 1 G RAM (2x512 MB Kingston HyperX)
XP 3000+ @ 2355 MHz, Vcore 1.750 V
Radeon 9800pro 128 MB @ 441 / 351.
When I increased the Vcore to 1,775 V (letting everything else unchanged) I
got a considerable boost in frame rate,
measured with the FRAPS utility when gaming IL2-FB (OpenGL).
I had this with Cat 4.1 and now Cat 4.2 drivers.

Didn't know there was a connection between CPU-Vcore and FPS.
Can somebody explain this phenomenon, pls?
Click to expand...

When I did a mo/bo change here, I experienced something similar - when I
had dropped the VCore too far (1.40 V in this case, for two 300A
Celerons), the integer benchmark scores in SiSoft Sandra were reduced by
about 1/8. At somewhat higher voltage (1.50 V), everything was back to
normal. My educated guess is that at the low VCore numerous ECC errors
in the caches occurred, reducing overall performance.

Stephan
 
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