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Can I DECREASE my motherboard's MINIMUM voltage?

B

BigDave

Member
I have a DFI P2XBL motherboard. It's a 440BX chipset, Slot 1 board. It's currently running a PII450 in it.

I wanted to upgrade, so I bought the MSI Slotkey converter, and a PIII 750 chip. I go to install everything, but the new chip won't boot. Then after doing some research, I find that this chip uses 1.65 volts, but the MINIMUM voltage my motherboard supplies is 2.0 volts. I'm thinking this is what the problem is. (Although it may be something else.)

So does anyone know if it's possible to get the voltage down lower so I can use my new chip in this board?

Thanks!

- Dave
 
Not sure if your specific board supports "Coppermine" cpu`s & DFI`s web site said (in the bios area) nothing about Coppermine cpu`s only Katmai P3`s. It might be possible to jumper the adapter to the required voltage also is the MSI adapter a "Master version...?" these are for either coppermine or non-coppermine cpu`s (original Celerons).
 
Yes, the MSI adapter is the Master version. The adapter should support Coppermine CPU's. I tried jumpering it to the specific voltage, but it didn't change anything. Still no boot.

However, I just read this in the FAQ section of DFI's site:

"Due to the VCore supply for P2XBL Rev. A/B/C/e were designed to be 2.0V at minimum level, the motherboard does not support Coppermine CPU. "

So, this gets me back to the original question. Is there any known way to get around this 2.0V minimum on the motherboard? Any BIOS, hack, resistor or something I can apply to get it to use the CPU?

I know it's a long shot, I didn't think this would be a problem though when I bought the CPU. Oh well, live and learn, right?

- Dave


 
BigDave I would put the P3 450 back in the MB and sell it as a combo and buy a coppermine supporting MB (CUSL2, P3V4X, I just prefer ASUS) and utilize the P3 750 rather than dumping it and taking a loss...


BTW the P3V4X is a darn good stable board with ISA slots if you need them...
 
You cannot decrease the minimum voltage as the voltage regulator built onto the motherboard supports VRM8.3, spec'ing voltages down to 1.8 volts. Coppermines use VRM 8.4, and should support voltages as low as 1.0 volts (I think).

Although DFI says that it only supports down to 2.0 volts, it probably goes down to 1.80 volts. 2.0 volts is the lowest "official" voltage used by VRM 8.3 processors....Deschutes P2, Katmai P3 and PPGA Celerons. I know that ASUS boards, even the earliest BX boards, go down to 1.80 volts. See if you can set your Slotkoet voltage to that.
 
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