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DDR is flaky and strange in K7VM2 mobo
Posted 28 April 2012 - 01:43 AM
However, I ran into 2 serious issues:
1) with 1 or 2 gig DDR in there, system would only post about 10% - 15% of the time. (vs. near 100% with SDRAM)
2) according to the bootup scren, the Athlon 2500+ was only 1900+ with DDR. (I presume, running at 133 MHz instead of 166)
I have 266, 333, and 400 MHz DDRs (tried pretty much all) and speed ratings didn't seem to make much of a difference, but they were all recognized only as DDR266.
The mobo has a jumper to set FSB to either 100 or 133 (set to 133) and the CPU clock was set to 166 in the manual setup portion of the BIOS.
Anyone seen anything like this? What could be causing it? Is there a way to make DDR RAM work reliably without downclocking the CPU?
When I had an Athlon 750 (100 MHz) in there, both SDRAM and DDR worked equally reliably.
Posted 28 April 2012 - 02:26 AM
That is a typical symptom of Northbridge choking... try setting them to DDR 200 and there's a good chance they'll run OK together.
I apologize for the wild goose chase, it turned out to be a case of 'bad' RAM.
Separately, both sticks test fine -- together, they erred out on the modulo 20 test....
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