FC3 64 + 4GB RAM = Unstable System ???

[rudi]

Hi !

I have a Tyan Tiger K8W (S2875) with two Opterons and just
installed FC3 64. Previously I was running FC2 32bit.

After installing FC3 64, my system crashes almost immediately
after booting. Removing two of the 4 Crossair 1GB simms,
fixes the problem. Any ideas suggestions how I can get the system
stable with 4GB ? I did not have this problem with FC2 32bit.
I tried recompiling the kernel (I was using 2.6.9 with FC2)
and that did not help either.

I have a low end Nvidia Video Card and 4 SATA drives.

Thanks !
rudi

[rudi]

I am still having this 4GB problem. Whenever I install 4GB of
memory my system crashes.

No problems whatsoever with 2GB of main memory. When I install
4GB of memory, I can boot and login in safe mode or tty. As soon
as I start an application that uses some more (?) memory the
kernel panics. I presume the same thing happens when I start X,
only there I never get to see the kernel panic message, the
system just hangs. So the boot process is ok, it's the memory
usage that seems to be fishy ....

So I suspect there is something funny about the kernel, or some
of it's parameters. I have run memtest86 for an entire day, no
hardware/memory problems where reported.

At this point I am very certain this is a kernel problem. Any
kind soul with suggestions/ideas, etc ?

Anybody else using 4gb of memory ?

Thanks !
rudi

[DiablosuX102]

Hmm..wow. I have that exact same MoBo and 2 opterons with 4 gigs of memory...I haven't recieved my heatsinks for my processors yet but am planning to install FC3_64 as soon as I do.

I will post what happens as soon as I get it all set up.

[g8keepR]

Did you check your memory timings? You may have to lower them possibly? Also did your system crash running the 32 bit version of fedora with 4GB of memory?

[DiablosuX102]

OK, I powered on my system and tried to install Windows XP, but as soon as it starts looking at my hardware it locks up....FC3_64 works just fine (so far) and I cannot find a chipset driver for Windows XP 64-bit Edition which installed with no problems.

Have you tried anything aside from Fedora?