Reply 760 of 1954, by kithylin
no to be defeated, I asked supermicro. Their response was "The board only officially supports chips up to 95W" I had a look at the power regulators, the X8DAL has 4 phases per cpu, the X8DAH has 5 with beefier parts. In a strange twist, I found myself installing the cpu's I had into the board, and it worked.
So the new 5687's are working fine in my 8XDAH, and now my old 5687's are working in the X8DAL. It's strange.
That said, during stress testing, the voltage regulators (infineon 050n03ls) are getting HOT. Uncomfortably so. I saw about 105C. The data sheet claims a max temp of 150C (302 Freedom), but 105c (221 Freedom) on the outer case is unacceptable from my point of view. Maybe installing the board in a case with proper cooling would be sufficient, but I want to get some heatsinks for these mosfets at the very least. I'm looking at a pack or two of these overprices shits: http://www.enzotechnology.com/mos-c1.htm and a tube of thermal adhesive.
According to cpu-world.com there's only one production s-spec code for the x5687, the other is an Engineering Sample, perhaps you have ES chips and you didn't realize it? That's about the only thing I can think of.
Glad you got it working though and.. I sort of encouraged you to keep trying. I knew they worked in that board, just didn't remember how I got it going. 😀