Hi Wayne.

20-Sep-03 10:15:00, Wayne Chirnside wrote to Matt Mc_carthy


  -=> MATT MC_CARTHY wrote to WAYNE CHIRNSIDE <=-

 MM>> 18 Sep 2003, 21:04, Wayne Chirnside (2:252/171), wrote to All:

 MM>> Hi Wayne.

 WC>> Ok I've never seen a Pentium MMX or any other CPU with contacts
 WC>> on the top of the microprocessor.

 MM>> Nor have I!  The original Pentium series was a "PGA", Pin Grid
 MM>> Array type chip. A large reddish colored ceramic square with all
 MM>> the pins under it. Later they came up with the smaller black
 MM>> pinless plastic chip intended to be soldered directly onto MBs,
 MM>> but instead soldered to a small PCB with all the pins on it to be
 MM>> used in the socket motherboards.  This was (I think) the "PFPG"
 MM>> chip, Plastic Flat Pinless Grid chip soldered onto an adapter
 MM>> board.  What I think you are seeing is the top ends of all the
 MM>> pins sticking through the adapter PCB.

 WC> That's what it looks like.

 MM>> If that is the case, the tops of the pins should be well below
 MM>> the top of the CPU itself, and a regular heatsink that uses a
 MM>> flat strap to snap onto the tabs of the socket should work fine.
 MM>> The bottoms of the heatsinks are normally anodized, and are
 MM>> non-conductive, unless the anodizing has been machined off.

 WC> Well I've never seen a flat strap heatsink retainer either but
 WC> shall check into a computer build shop for one.

well, they bend the strap into a sort of [ shape and it clips onto the lugs
on either side of the socket.

 WC> I was thinking about a dab thermal compound and a dab of gel super
 WC> glue around the edge of the thermal contact area. What do you
 WC> think about this?

there's also thermal compound that sets like glue out there...



 -=> Bye <=-

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