K8V unstable with more than one chip

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Does anyone have a problem with the K8V when they use more than one memory
slot. I have a friend who's new K8V locks up or reboots when he uses a
second memory slot and does anything that uses more than a moderate amount
of processing like a game.

Each memory stick is new and on the Asus list and both work perfectly when
used independantlty. He used the memory in practically every combination of
the slots available and it still locks up very quickly. Is he stuck just
using one of his 512mb chips?
 
news.lightship.net said:
Does anyone have a problem with the K8V when they use more than one memory
slot. I have a friend who's new K8V locks up or reboots when he uses a
second memory slot and does anything that uses more than a moderate amount
of processing like a game.

Each memory stick is new and on the Asus list and both work perfectly when
used independantlty. He used the memory in practically every combination of
the slots available and it still locks up very quickly. Is he stuck just
using one of his 512mb chips?
Click to expand...

Did you see table 1 in the manual ?
Slot 1 and slot 3 for two sticks.

The way the S754 processor works, is the processor is termed "single
channel", because it has one 64 bit wide data bus. But it has two
address busses. One address bus connects to slot 1. The second
address bus connects to slot 2 and slot 3. Notice in table 1,
how the allowed speed drops, when both slot 2 and slot 3 are
occupied.

If it is still cranky, your options are:

1) Drop DRAM rate in the BIOS from DDR400 to DDR333.
2) Change the Command Rate setting. I'm not sure the
manual is showing the options correctly, because
command rate is either 1T or 2T. The Auto setting
should count the number of banks of memory loaded
onto each address bus, and pick the setting based
on that. Forcing the setting to 2T should stabilize
the memory for you, if you find Auto is doing
something stupid.

After you've done that, get a copy of Prime95 from mersenne.org
and run the "torture test" option with mixed FFT size. If your
system is stable, that test should run for hours and report no
errors. It is possible to pass memtest86+ for memory, but still
fail Prime95, so Prime95 is a more sensitive test of goodness.

Paul
 
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