I'm hoping to find someone who can tell me quite a bit about specific details regarding the pre-POST tests, and particularly when DQS Training is performed.
I built my computer last November, but I've never managed to get the POST time below 20 seconds, and doing even that well has been very rare. It has averaged 4˝ minutes to POST (i.e. BEFORE getting as far as the Bootscreen).
The system is a difficult one, using an AMD mobo that has a highly theoretical ability to handle 16GB of RAM. This system carries 8GB of DDR2-1000 which the AMD Athlon 5600+ sees as DDR2-800, and between the mobo, the RAM, and that CPU, the system is pretty tricky. I have 4 hard drives and a Corsair HX520W PSU. The PSU tests OK with my little TT Dr Power, plus it calculates as correct for the load by Corsair and NCIX. I recently RMAd the motherboard back to L.A., but received it back as "repaired" without a word of comment from Gigabyte.
A G.Skill RAM tech has told me the RAM must be functioning properly as my ONLY problem is the slow POST. Windows works fine. I'm running no changes to my CPU voltage, but I use
NB +0.3V = 1.400V (recommended by the G.Skill tech as required by the 8GB of RAM)
DDR2 +0.200V = 2.000V
Trfc 4 @ 327.5ns
I feel the RAM needs all the help it can get, and I like DQS to perform. I know little about it. I notice that DQS training seems to take a long time whenever I have made changes in
- CMOS battery removed and replaced
- BIOS flashed
- voltages modified; Trfcs changed
- hard drives removed or replaced
But I'd really like to know what is happening when "nothing" seems to be happening: when the computer is powered on from cold, and the fans spin and there are lights, but you would think the case was otherwise dead—UNTIL there is a POST beep, which can be quite a few minutes in happening. After a battery out-and-in + BIOS flash + setting all the BIOS voltages as above, I have had up to 48 MINUTES of "nothing happening" before that POST beep. The usual after a BIOS flash is 10 or 15 minutes.
Later, on subsequent cold startups, the POST time drops to its average of 4˝ minutes. Recently I have sometimes had it down to just below 2 minutes. I haven't seen 20 seconds since August—and I lost that when I flashed the BIOS from F8 to F10. Retrying F8, I never succeeded in getting it back, although I have meticulous records of all my settings.
If I knew more about the actual process of DQS training, or just where the POST is delaying, it would be very very helpful. Thanks.
Edited by Grongle, 09 October 2009 - 11:19 AM.