ppga and fcpga

[wtf]

difference between the 2?

[RobRich]

Not a whole lot. Both have the same number of pins, but the newer Flip Chip version has changed a few pin assignments. If you plan to use a fcpga cpu in a ppga motherboard, then you will need an adpater that is currently only built by powerleap. Also, the s370 socket to slot1 slockets are different, but most most fcpga version will also support the older pga format. An example is the Iwill Slocket II.

[mrdisco]

What about heatsink attachments? Can the same heatsink attach to both of these, or do they have different snaps?

I'm considering getting an FC-PGA slocket and I'd like to know if I'll need to get another heatsink along with it.

[RobRich]

Both types use the s370 format, so about any socket7/socket370 will work. I will warn that with newer .18micron cpu's that you might need an updated heatsink or a small shim so the hs/fan won't time over. The .18 core is MUCH smaller than the older .25 format.

[This message has been edited by RobRich (edited 04-21-2000).]

[Plaster]

Actually, the FC in FCPGA stands for Flip Chip. The .25 micron Celerys, or PPGA had thier cache facing down in the socket. That is why there is that huge metal slug on the PPGA celery. IT's there to attempt to draw heat away from the pocket of the socket. heheh.

The Flip Chip design is just what it sounds like. The Cache is flipped up, so it comes into direct contact with the heatsink. This results in a much lower running temperature than the PPGA chips. This explains the insane overclocking ability of the FCPGA coppermine chips.