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p4-m celeron voltage pin-mod...

R

razor1000

Limp Gawd
Joined
May 2, 2002
Messages
305
I've heard about people putting the mobile p4s into their desktop machines, and I finally took the plunge and got one. Well, Celeron actually, but it's a Northwood-based, 256k L2 variety. It's a 1.7Ghz, SL6J3.

I was hoping for some easy, drop-in lovin', but I figured it would take a little tweaking.

From what I gather, the problem is voltage. Mobile P4s use 1.3v, while desktops use about 1.5v. I took a look at the tech docs, and it looks like the difference is two pins. VID4 is high for 1.3v, and needs to be low. VID3 is low, and needs to be high. So what I'm guessing is clip VID4, and connect VID3 to VID2.

Luckily the board I have it on is actually a 423, with the little converter board, so I was thinking I would just clip the pins on the converter instead of on the CPU itself.

I'm just curious if anyone has actually done this pin-mod... and if it looks like I'm doing it correctly. Thanks!
 
Here's a pic of the 423 VID pins, if anyone wants to double-check me.

423.JPG
 
Just wondering if you've done the vmod and how it turned out. I've been keeping my eye on a few mobile P4 & mobile celerons on eBay.
 
I've been looking for one also...

But why not run it at 1.5v? Its basically the same chip, its just that its been "chosen" for the mobile division because its a higher quality chip.

Unless if you really care, I'd just leave it alone.
 
I just run my P4M at default 1.525 v (IC7-G).
Its a 1.6M (16x100) thats running 200fsb at that voltage...(for only $30)
 
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