On Mon, Mar 9, 2009 at 3:39 PM, Victor Padro <vpadro at gmail.com> wrote: > > > On Mon, Mar 9, 2009 at 1:18 PM, Louis Lagendijk <louis at lagendijk.xs4all.nl> > wrote: >> >> On Sun, 2009-03-08 at 19:27 -0700, John R Pierce wrote: >> > Rick wrote: >> > > In article <20090308031754.GA11794 at bludgeon.org>, >> > > Ray Van Dolson <centos at centos.org> wrote: >> > > >> > > >> > >> That sounds pretty strange. Have you confirmed that removing the >> > >> "new" >> > >> memory allows you to run in runlevel 5 again? >> > >> >> > > >> > > Yes, that's how I'm running right now. >> > > >> > >> > now, try taking out the OLD memory and putting in just the NEW memory. >> > see how it runs that way. if this works, try with the new 4GB as the 0 >> > bank, and the old 2GB as the 1 bank. >> > >> > also, in the BIOS, check the memory timings, I'd leave them all on >> > 'automatic' or 'default' or whatever the limited choices are in the >> > Intel BIOS, trying to squeeze an extra clock out of CAS or whatever >> > doesn't really help much under the best of conditions and it can >> > destabilize a system under suboptimal conditions. >> > >> When you use 4 banks of memory, some boards require slower settings. >> Tweaking the voltage may help there I guess, but I would opt for the >> slower settings. I recall that my BIOS chose a slower memory setting >> when I added 4G to my small server at home that already had 2G.... That >> system has been rock stable (except for my Sun quad ethernet that had >> problems with the Xen kernel due to MMIO issues. I solved that by >> ditching the Sun card and using a vlan capable switch with vlan trunking >> so that I no longer need so may ethernet interfaces) >> >> Louis >> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> http://lists.centos.org/mailman/listinfo/centos > > have you read your technical product specifications? > http://www.intel.com/support/motherboards/desktop/d975xbx2/sb/CS-029346.htm > it states that the supported memory modules are only 2GB top > > Table 4 lists the supported DIMM configurations. > Table 4. Supported Memory Configurations > DIMM > Capacity > Configuration > (Note 1) > SDRAM > Density > SDRAM Organization > Front-side/Back-side > Number of SDRAM > Devices (Note 2) > 128 MB SS 256 Mbit 16 M x 16/empty 4 [5] > 256 MB SS 256 Mbit 32 M x 8/empty 8 [9] > 256 MB SS 512 Mbit 32 M x 16/empty 4 [5] > 512 MB DS 256 Mbit 32 M x 8/32 M x 8 16 [18] > 512 MB SS 512 Mbit 64 M x 8/empty 8 [9] > 512 MB SS 1 Gbit 64 M x 16/empty 4 [5] > 1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16 [18] > 1024 MB SS 1 Gbit 128 M x 8/empty 8 [9] > 2048 MB DS 1 Gbit 128 M x 8/128 M x 8 16 [18] > Notes: > 1. In the second column, “DS” refers to double-sided memory modules > (containing two rows of SDRAM) > and “SS” refers to single-sided memory modules (containing one row of > SDRAM). > 2. In the fifth column, the number in brackets specifies the number of SDRAM > devices on an ECC DIMM > > So your 4GB module is not supported... you should use 4x2GB modules in > order to see an improvement(always using pairs, remember it's dual channel). > > cheers > > > -- > "It is human nature to think wisely and act in an absurd fashion." > > "Todo el desorden del mundo proviene de las profesiones mal o mediocremente > servidas" > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > > Victor seems to have found your problem. But you might want to verify there isn't a BIOS / firmware update for your motherboard. memtest distributed with most systems is old. One of the memtests was recently updated to for the latest intel chipsets.