P3V4X FSB Confusion

  • Thread starter Thread starter Les Noel
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Les Noel

This mobo has JumperFree selected, all DIPs in OFF position.

Running Celery 1300, O/C to 1600 (124FSB) and VIA 4in1 4.51v Pro Beta on
Win98SE.

Can still only see 16 FSB choices in the BIOS (1006.004 Beta) setup -
shouldn't there be 32 choices?

Suggestions appreciated, thanks.
 
Les said:
This mobo has JumperFree selected, all DIPs in OFF position.

Running Celery 1300, O/C to 1600 (124FSB) and VIA 4in1 4.51v Pro Beta on
Win98SE.

Can still only see 16 FSB choices in the BIOS (1006.004 Beta) setup -
shouldn't there be 32 choices?
Click to expand...

Possibly, it depends which clock chip your board has - AFAIK there were
two chips used on the P3V4X:

ICS9250-08: supports 16 FSB settings between 66.8Mhz and 150.0Mhz
ICS9250-18: supports 32 FSB settings between 66.9Mhz and 166.0Mhz

Which do you have?

P2B
 
Thanks, P2B - have the ICS9250-18 \ Winbond W83195R-08 chips (according to
SiSoft Sandra).




Les said:
This mobo has JumperFree selected, all DIPs in OFF position.

Running Celery 1300, O/C to 1600 (124FSB) and VIA 4in1 4.51v Pro Beta on
Win98SE.

Can still only see 16 FSB choices in the BIOS (1006.004 Beta) setup -
shouldn't there be 32 choices?
Click to expand...

Possibly, it depends which clock chip your board has - AFAIK there were
two chips used on the P3V4X:

ICS9250-08: supports 16 FSB settings between 66.8Mhz and 150.0Mhz
ICS9250-18: supports 32 FSB settings between 66.9Mhz and 166.0Mhz

Which do you have?

P2B
 
Les said:
Thanks, P2B - have the ICS9250-18 \ Winbond W83195R-08 chips (according to
SiSoft Sandra).
Click to expand...

In that case the BIOS *could* offer 32 FSB choices, but maybe Asus
didn't implement them. What is the fastest choice available? If it's
150Mhz, I suspect Asus didn't go to the trouble of detecting which clock
chip is present and adjusting the options accordingly.

I'd take a look for myself, but the only P3V4X boards I have were dead
when I got them so I stole the clock chips and put them on P2Bs :-)
 
P2B said:
I'd take a look for myself, but the only P3V4X boards I have were dead
when I got them so I stole the clock chips and put them on P2Bs :-)
Click to expand...

With what kind of results, btw?

Stephan
 
Stephan said:
With what kind of results, btw?

Stephan
Click to expand...

In a word, disappointing :-(

Only one of the dead P3V4X boards boards had a 9250-18, and I
transplanted it onto an LS 1.03 and added the 4th FSB jumper - but
unfortunately the board is not stable above 140Mhz even with processor,
ram, and video that work perfectly at 150Mhz on an S 1.04. SoftFSB
recognises the chip and is able to set it to 166Mhz, but the system
freezes within a few seconds. I suspect the BX chipset is an older
stepping and doesn't overclock so well.

At the time it seemed to make sense because the LS 1.03 had a 9150-08,
but if I get my hands on another 9250-18, I'll try it on a board that's
known to be stable at 150Mhz.

P2B
 
Could, but doesn't, so your theory is probably bang on. Highest is 150 MHz.
Thanks again.



Les said:
Thanks, P2B - have the ICS9250-18 \ Winbond W83195R-08 chips (according to
SiSoft Sandra).
Click to expand...

In that case the BIOS *could* offer 32 FSB choices, but maybe Asus
didn't implement them. What is the fastest choice available? If it's
150Mhz, I suspect Asus didn't go to the trouble of detecting which clock
chip is present and adjusting the options accordingly.

I'd take a look for myself, but the only P3V4X boards I have were dead
when I got them so I stole the clock chips and put them on P2Bs :-)
 
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