Thane,
I dl'd and looked at the specs for both chips. If it were me, I would not even think about a swap. First the ratio's (?) are not compatible, and then the FSB speeds are not even close. One is a Celeron and the other is a true P4. May not be same "family/etch/stepping" going on here. I would expect that the results you have so far are as good as it gets! I vote for a no-go this time. I suppose you have a dead m/b for sure, and, maybe (?) a dead cpu, but w/o a working m/b for each cpu (for elimination) it is a hard call.

AND, I went to sleep all during the Pentium 4 series, so I could be very lame.......I went AMD at the P4.

BTW, the antique Micron is now parked (retired) after getting its' scsi bios update AND 61 winupdates ! LOL! Works like a champ now......(a future server).......Thanks.
Best,
Duncan
At 14:15 06/14/2007 -0400, you wrote:

I have an older PC (well not older in Duncan's sense, but older) :) - it has an SL79L processor (http://processorfinder.intel.com/details.aspx?sSpec=SL79L) and it won't boot (00 on the POST card.) The CPU won't work in another machine that works with an SL69Z (http://processorfinder.intel.com/details.aspx?sSpec=SL6ZY) and the SL69Z won't work in the original machine.

So my problem is: do I have a dead motherboard and CPU or a dead motherboard or CPU and imcompatible CPUs?

Is there something that would make a machine that can handle an SL79L unable to use an SL69Z or vice versa? It's the same package, the same core voltages, but the bus and multipliers are different. Surely the SL79L should work in a slower motherboard.

T



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