On Thu, May 10, 2012 at 8:16 PM, Stan Hoeppner <s...@hardwarefreak.com>wrote:
> On 5/10/2012 12:47 AM, Mohtadin Hashemi wrote: > > Sorry for double and top post. Pushed the wrong button. > > > > I was saying that the RAM are all Mushkin 996770, i was also going to > buy a SuperMicro board as i have very good experience with those but i had > to wait 1 mo th for it, time that i dont have. Again i went with the > Mushkin dimms because i could get them quickly, otherwise i would have > bought kingston rdimms which i use in all my other computers. > > > > I now know that my kingston dimms don't work on the board, so it must be > a BIOS issue. I say this because in the BIOS changelog there is an entry > for update concerning RAM not recognized by OS, which they claim has been > fixed. > > Socket G34 is able to work with 8x 4GB SR or DR unbuffered DIMMs at > 1333MHz at 1.5v, even 1600Mhz at 1.5v with 6200 series CPUs. So this > may be a board specific problem. You mentioned that removing 4 DIMMs > allowed Debian to recognize 48GB. Try this... > > With all 16 DIMMs installed, enter the system BIOS and change "Memory > CLK" in the Advanced/Northbridge menu to 533MHz, save and reboot. This > should drop the memory bus frequency from 1333 to 1066. If the problem > is due to electrical bus loading at 1333MHz, lowering the freq may help. > This is probably a log shot, but worth testing as it's quick/simple. > > If this doesn't fix the issue, and memtest and other utils can see all > 64GB just fine, then I'd say you're dealing with a BIOS bug. > > BTW, you originally mentioned you pulled all 16 sticks from a production > server that had run fine for months/years, and installed them in this > system. Now you tell use you ordered the 16 Mushkin sticks for this > build. This conflicting story leads me to wonder exactly what memory > you have, where you're being straight with us, and where you're not. > Makes it really hard to assist in this troubleshooting effort when we > don't know what information is reliable. > > > -- > Stan > I have not been clear then: The RAM that was pulled from a working environment was/is 6 Kingston RDIMMs with 8GB each. The Mushkin RAM was ordered specifically for this server/board. As for lowering the frequency, I did actually try; both 533 and 400 MHz - neither helped. I wrote a few e-mails back that the 48GB config does not work anymore - lending more credential to the "BIOS is at fault" theory. I have not touched the OS, just reset CMOS every time I have changed RAM modules. Other things I have tried are: 1) Disable the 2nd CPU via BIOS and install only one 8GB DIMM - this did not work, again only 3.5GB was shown. 1.a) Disable the 2nd CPU and install two 4GB DIMMs - does not work. 2) Gradually increase 4GB DIMM count from 2 to 16 - the same result as all the other times. I don't know any other utilities that do a similar job as memtest, otherwise I would have tried it. As it is now, only memtest and BIOS can recognize all 64GB RAM.
