BIOS was patched correctly. So it's not BIOS problem. I think it's VRM's problem, i.e a hardware incompatibility.
The published core voltage range for the Core 2 E6600 is 0.85 - 1.5V; for the SLGTD it is 0.85 - 1.36V. Not much difference. I'm starting to miss the days when MOBOs had a handful of jumpers.
Again, I appreciate all your effort. Maybe this exchange will answer questions for other 9200/XPS users.
Try to find Wolfdale CPU with FSB=800Mhz - Pentium E5x00
Do you use PCI-E graphics? Try to find old PCI graphics.
(12-21-2017, 06:39 AM)DeathBringer Wrote: [ -> ]Try to find Wolfdale CPU with FSB=800Mhz - Pentium E5x00
Do you use PCI-E graphics? Try to find old PCI graphics.
I do not have any other Wolfdale CPUs. Am using a PCI-E graphics card. Replaced it with a PCI one and still no luck.
I have two SLGTD/E7600 CPUs and just tried them in an Optiplex 755; they work fine there.
Try to find Core 2 Duo E7300 or E7500. They has non-fractional multiplier.
(12-21-2017, 12:31 PM)DeathBringer Wrote: [ -> ]Try to find Core 2 Duo E7300 or E7500. They has non-fractional multiplier.
It did occur to me that the clock multiple might be an issue, since the Vcore voltage and FSB seemed compatible. I'll see if I can pick up a cheap E7500 and give it a try.
I've compared datasheets for 65-nm & 45-nm CPUs for LGA775.
Some differences was found:
Code:
Pin 65-nm 45-nm
AK1 THERMDC FC24
AL1 THERMDA FC25
C9 FC38 FC41
L2 TESTHI13 SLP#
P1 TESTHI11 DPSLP#
T2 FC4 DPRSTP#
Y1 FC0 FC0/BOOTSELECT
Y3 FC17 PSI#
Try to isolate pad AK1 & AL1 on your current CPU and try to boot.
Then also isolate these pads: L2, P1, T2, Y3.
And try to boot again.
In case of successful results do it with new CPU.
Can't think of a way to do that which does not involve irreversible modification of the socket pins. Or one could apply lacquer to the CPU pins, but it would take a steadier hand than mine.
Just use some pieces of sticky tape and pincette. Glue them to CPU.
Look at
LGA775 pinout (CPU top view).