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celleron400 ocing-advanced question

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Name: mrx
Date: August 22, 2004 at 01:42:53 Pacific
OS: beOS
CPU/Ram: athlon400 128
Comment:

I have been working on this all day... i have successfully converted an old hp MEB-VM pulled out of an hp system from hp bios to the asus bios version. apparently it had this special winbond bios cmos with built in auto boot block protect and the motherboard had auto boot block protect too, which couldnt be changed in th drab hp bios. after trying to flash with uniflash, awflash (the version soposibly to override my winbond chip) , awiflash , and phflash without working at all. so i had to hot-flash the cmos with uniflash(a different SFT brand bios chip i think it was) so then i popped the fresh cmos in with the latest bios for the mobo and everything works great. except. as you know, it was an hp oem board so the fsb frequency selections are gone exept one jumper that brings it from 400 to 600 with 6x multiplyer.
with the frequency bus changers, also i think it is a pll ic? about a 2.5cm x 1cm thing that is print OSC on the board. also printed on the board where it is is 27.6Mhz it is located top right, right beside the empty fsb frequency adjusters. but it is gone. you can see it with the manual for meb-vm from asus. i have been trying to bridge solder the jumper connections (remember just the board is there without the jumper part sticking out) to macth up with what the manual sais to do to get a higher fsb (133 to get 800mhz at 6x )but it wont seem to boot when i do this. do i really need that part to put on it, or am i just stuck at 600?

i really think hp did this just to make me and everybody else angry. this was pre-planned by hp.




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Response Number 1
Name: jam
Date: August 22, 2004 at 05:59:47 Pacific
Reply:

you're trying to double the clock speed of a Celeron 400 (6 x 66mhz) to 800mhz (6 x 133mhz)? I kinda doubt you'll be able to pull it off...maybe 600mhz though. But according to this article, even that doesn't seem very likely:

http://www.firingsquad.com/hardware/celeron400vs/page9.asp


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Response Number 2
Name: mrx
Date: August 22, 2004 at 12:12:27 Pacific
Reply:

can anybody say how i can get the fsb frequency ajusters to work???


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Response Number 3
Name: SkipCox
Date: August 22, 2004 at 17:33:41 Pacific
Reply:

Jam is on the right track here. The Celeron 400 is a poor overclocker compared to other Celerons (like the 366 for example) and most I've seen have stability problems even at 600Mhz.

To answer your question though, I'd have to assume that you'd make and break solder bridges just as if they were jumpers. You gotta know it's a crap shoot at best.

If you're stable at 600Mhz, I think you're pretty lucky...most don't seem to make it that far.

I also had no luck trying this on an Intel AA754552-204 motherboard w/ a Celeron 400.

Skip


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Response Number 4
Name: heropsycho
Date: August 23, 2004 at 11:56:42 Pacific
Reply:

In fact, most Celeron 400's can't even hit 600MHz. If you got that far, consider yourself lucky. You will fry the CPU if you attempt 800MHz. I don't make many guarantees, but I'll guarantee you that!

MCSE, MCSA Messaging, baby!


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Response Number 5
Name: mrx
Date: August 23, 2004 at 22:29:22 Pacific
Reply:


really? i find my cpu very stable (ran cpu burn for
Beos all night)
i have already bridge soldered the points about 12
times but ive figured out on this 'hp stripped down
version' of the asus MEB-VM they take out the
osillator or pll ic for the fsb frequency changer.
but with just puting the only jumper on the fsb
frequecy on 1-2 , and multiplyer at 6.0 and voila!
the version of celoron 400 cpu that oc's up to 768
http://www.cpudatabase.com/CPUdb/Showdata.cfm
is the sl37x and i think thats the one i have.

now where can i get my self that part so i can
solder it on to get my frequency changers to work?
skip? do you have the part for me? i pay shipping.

the only way i have ever fried a cpu is to high a
voltage. i know heat can do it to. i dont have any
thermal paste on the cpu. just thermal pad,
modified alum HS with top fan from a super orb
cooler sucking the air off the cpu.


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