Dual MMX chips in a Tyan Tomcat IIID?

[jkersenbr]

Just wondering if anybody has ever tried dual Pentium w/MMX cpus in a Tyan Tomcat IIID (S1563D) mobo. I currently have dual 200 classics and am thinking of selling them and getting 200MMX's (which are cheaper).

The Tyan site says that "support for MMX cpu's faster than 166MHZ in SMP mode is undocumented".

Undocumented doesn't necessarily mean incompatible, does it...

Just curious to see if anybody else has done it.

Thanks.

 

[JonJon]

not usually, just means that it's not offically support...also from what i've experienced with smp is that you should have processors that are at least from the same die sequence. if possible, it's best to find processors with sequencial serial numbers but that's not realistic at this point....anyways it may be hard to get dual mmxs to run right, you need very closely manufactured chips.....

 

[Peter]

Be careful - many of the later, higher clocked Intel Pentium or -MMX chips aren't SMP capable. Check in Intel's Pentium Specification Update document (developer.intel.com) to see which ones do and which ones don't, and then make sure you're buing SMP capable ones. (You can tell from the manufacturing run code aka S-Spec. Said document explains it.)

Regards, Peter

 

[Arch!]

I've had such a board once and I remember getting rid of it just because it couldn't run with these MMX CPU's. I had the first revision of the board, which was not capable of supplying the correct amount of voltage to the CPU (I believe this was 3.3 external and 2.85 core). Tyan did release an updated version of the board (revision 3 or 1.03 or something like that) that DID
support the MMX, but I don't know if that was also valid for dual CPU's.

Anyway, you can check your revision of your board somewhere on the PCB ; it is printed on it.

Bye!


Arch