It was actually bad,

Yesterday i was haveing some boot troubles after a clean install of osx (no chime, nothing onscreen) i tried reseating the ram and ended up putting the first stick into the last slot, and that caused it to boot.

booted into single user and ran a 5 pass mem test, every test compleated just fine, so i thought no more of it

then it started crashing again, no kp's but just hard lockups whenever i got down to about 10mb free ram. so i pulled the last stick out and it booted just fine, no lockups.

At least it is just a 64Mb stick would have been gutted if it was one of my few 512mb sticks