ASUS P5P800 Instability at High FSB

[gnode]

I've seen some discussion in other threads about

Instability at High FSB (> 260 MHz) with the ASUS P5P800,

But no answer or clues as to how to proceed to find an answer.


Anybody have any ideas or suggestions?


Is the instability real or just a measurement issue?

Any suggested plan of attack?


Update: Solution -- Used a 20 pin to 24 pin adapter for the atx power supply

Rock steady at a FSB of 270 MHz -- Thanks, I Found NEMO :woot:

[gnode]

Could using a 24 pin atx connector instead of the standard 20 pin make a difference?

[i found nemo]

yes, an adapter would help

[joot]

Instability could be due to a lot of things. But, with this board (P5P800), vcore droop is a big issue. It needs to be modded for stability...

[gnode]

Instability could be due to a lot of things. But, with this board (P5P800), vcore droop is a big issue. It needs to be modded for stability...

Thanks, I'll do the mod over the next few days and we'll see what happens.

Anybody have any success getting rid of the instability by doing the vdroop mod?

Please post your experience.

[gnode]

Thanks, I'll do the mod over the next few days and we'll see what happens.

Anybody have any success getting rid of the instability by doing the vdroop mod?

Please post your experience.


Okay, I did the vdroop mod. Still reads 0 MHz at a fsb of 276. Obviously the cpu is not running at 0 Mhz so it looks like a measurement problem.

I think that the hardware monitoring is done with a Winbond W83627.

Anybody with any ideas?

[gnode]

Okay, I did the vdroop mod. Still reads 0 MHz at a fsb of 276. Obviously the cpu is not running at 0 Mhz so it looks like a measurement problem.

I think that the hardware monitoring is done with a Winbond W83627.

Anybody with any ideas?

More info --

When I run superPi, I see the processor speed drop way down but no change in the time it takes to do each loop.

Clearly, this means that the processor is not running at a really low speed.

The problem is definitely a measurement problem.

Where is the processor speed measured for display by the bios?

[gnode]

More info --

When I run superPi, I see the processor speed drop way down but no change in the time it takes to do each loop.

Clearly, this means that the processor is not running at a really low speed.

The problem is definitely a measurement problem.

Where is the processor speed measured for display by the bios?

Update: Solution -- Used a 20 pin to 24 pin adapter for the atx power supply

Rock steady at a FSB of 270 MHz -- Thanks, I Found NEMO :woot:


Now at FSB of 280!!!

[Drager2]

Does any body know what is fsb WR for i865P\PE chipset? 333MHz?