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Long post, apologies in advance want to supply all the info....
Each boot of my machine seems to detect a random amount of ram somewhere between 2GB and the full 12GB. I have two 6GB kits (total of 6 x 2Gb sticks) of RAM in my Asus P6X58D Premium.
I built the machine about a week ago and on first boot all 12GB showed up in POST and Windows with all BIOS setting at default. The next few boots were also fine. I noticed that the RAM was running at 1035 and any attempt to raise that causes less than the full amount to be detected. Resetting the DRAM Freq back to the lowest setting or AUTO (sets lowest automatically) will eventually allow the whole amount to be detected, usually only after several reboots, after unplugging the PSU, popping the mobo battery, cycling the power switch unplugged to discharge any residuals, swapping the RAM out to different slots and holding the mobo reset switch and rolling up one trouser leg and I'd eventually get back to 12GB showing in POST (after boots with 2GB to 10GB and everything in between being detected).
Once 12GB is detected (at lowest DRAM) the machine is perfectly stable and holds mild o/c fine with good voltage and temps with the RAM timings set manually (9-9-9-24) , BCLK 172, vcore 1.2v, VDIMM 1.5v (in accordance with RAM specs) it ran prime95 for 7 hours, LinX for 2 hours at 3.61GHz 1.2v vcore without errors.
I've also ran Memtest86+ with all 12GB in and again no errors.
Then on reboot after memtest - 8GB detected!
I've tried raising the QPI voltage as high as 1.4v and I've tried raising the tRFC from 59 (AUTO setting) to 74 or even 88 but nothing seems to work.
Please help GSKILL TECH!
Each boot of my machine seems to detect a random amount of ram somewhere between 2GB and the full 12GB. I have two 6GB kits (total of 6 x 2Gb sticks) of RAM in my Asus P6X58D Premium.
I built the machine about a week ago and on first boot all 12GB showed up in POST and Windows with all BIOS setting at default. The next few boots were also fine. I noticed that the RAM was running at 1035 and any attempt to raise that causes less than the full amount to be detected. Resetting the DRAM Freq back to the lowest setting or AUTO (sets lowest automatically) will eventually allow the whole amount to be detected, usually only after several reboots, after unplugging the PSU, popping the mobo battery, cycling the power switch unplugged to discharge any residuals, swapping the RAM out to different slots and holding the mobo reset switch and rolling up one trouser leg and I'd eventually get back to 12GB showing in POST (after boots with 2GB to 10GB and everything in between being detected).
Once 12GB is detected (at lowest DRAM) the machine is perfectly stable and holds mild o/c fine with good voltage and temps with the RAM timings set manually (9-9-9-24) , BCLK 172, vcore 1.2v, VDIMM 1.5v (in accordance with RAM specs) it ran prime95 for 7 hours, LinX for 2 hours at 3.61GHz 1.2v vcore without errors.
I've also ran Memtest86+ with all 12GB in and again no errors.
Then on reboot after memtest - 8GB detected!
I've tried raising the QPI voltage as high as 1.4v and I've tried raising the tRFC from 59 (AUTO setting) to 74 or even 88 but nothing seems to work.
Please help GSKILL TECH!
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