Asus P4s533 serious undervolting??

[OneOfTheseDays]

My buddy is having trouble with overclocking his C1 2.4B processor on his asus p4s533. Now he doesnt intend to keep his system overclocked, he only wants to try it out. So we try it out at 133 and slowly move up to 145. 145 fsb is good and then we go to 150. Bam, we get errors , prime95 gives errors, and a lot of weirdness. Naturally I expect the lack of PCI/AGP to be the problem, since his ram is good stuff Hyperx 3500. Well, i fired up MBM 5 and looked at his voltages and man, under load his CPU voltage drops from the 1.550 default voltage all the way to a constant 1.48 voltage. It doesnt fluctuate at all it just stays at 1.48, so man this is pretty messed up right? This isnt supposed to happen is it? THats quite a drop in voltage i would say.

 

[THUGSROOK]

thats normal

 

[OneOfTheseDays]

aight cool. Looks like his hsf wasn't mounted properly, and his temps were actually quite high. So we fixed that and now he's stable at 145 fsb. 150 is a no go because of lack of AGP/PCI lock i'm sure. He's gettin all sorts of wacky errors at anything at or above 150 fsb. He's happy at 145 fsb, 4:6 memory ratio, its quite fast for him.

 

[Duvie]

The sis chipset is a very poor overclocker...

the old sis645 chipset barely got much above 137fsb....

the sis645dx like that board many could not get 150fsb stable....this is likley a board limitation...at 150fsb which it has a 1/4 divider the pci would only be 37.5mhz and that is far from being way out...some nic cards and older hDD's could have issues but this is not that far out of spec...

the sis648 chipset seem to get to about 160fsb...

the sis655 chipset from all I can tell with C1 xchips and not p4 mobiles and b0 stepping chips most can't get past 170fsb...

Over all this time comparable intel chipsets were far better...

 

[OneOfTheseDays]

yea i know , i got an IT7 max and am itching to try out my new sl6rz processor on it.

 

[Duvie]

Now that is an overclockers board...good luck!!!