FCPGA vs. FCPGA2 Socket Types?

[beatmix01]

So, I just found an old machine which is based on the FCPGA 370 Socket. I have determined the processor is fried and I am going to replace it.

What is the difference between the FCPGA and FCPGA2 Sockets?

 

[gwag]

FCPGA2 (Tualatin, 1.1- 1.4 GHz, with 256 and 512K cache versions) celeron or P3, but should support all FCPGA chips too i think.
if you dont know find out the chipset and se what it supports sometime a bios update is all that is need to ID chips.

 

[KF]

Intel changed the function of a couple of pins, and the chip works on slightly different signaling voltages and signalling specs. Intel produced the FCPGA2 for higher clock speeds with some overlap in speeds of the FCPGA. The pin change makes it so a FCPGA2/Tualatin goes into a non-functional (but non-damaging?) mode when put in the older socket. There were mobos that took either FCPGA or FCPGA2 that were produced after FCPGA2 came out. They used the pin difference to automatically switch to the correct signaling specs. There was an oddball non-approved (by Intel) adapter that rewired a couple of pins but operated the chip on the still out-of-spec FCPGA voltages. It does not work on all mobos for reasons no one ever tracked down.

In general the two are not interchangeable.