Memtest 86 Failure on new machine: now what?

[wallie_x]

I just put this beast together a couple of weeks ago, and I've been having trouble with stability and possible data corruption, system crashes and what not.
I ran Memtset 86 v2.8 on it only once at stock speed and it passed. I upgraded to the newest version of Memtest and ran it again. I now get errors at stock speed 166/166 FSB but only in test #5. If I increase the RAM timing to CAS 'SPD' with the timing set to 'Fast" I get numerous errors. With the FSB set to synchronous 148/148 FSB I get no error. I do not have another stick of DDR 2700. How I be sure it's the memory and not the CPU or the chipset causing the errors? I put the DIMM in both slot 1 & slot 2 to test. Also, on two consecutive runs of memtest in slot 1 the errors were at the same address on the same test #5. Sounds like bad memory to me!?!?

ECS K7S7AG rev. 1.5
Athlon XP 2600+ 333FSB
K-Byte 2700 DDR 512 MB
Maxtor ATA 133 7200 RPM 40 GB HD
Win XP w/o SP-1

[Nighthawk]

It sounds like bad memory to me, too.

One thing you could try to see if it's the RAM or motherboard is to put the RAM into another machine and try it there.