I had bought a pair of these back in September...

I never could get them over 537.5 (ddr2-1075) with 4-4-4 timings no matter the voltage. So I ran them at that (537.5 @ 2.35 volts, which seemed stable)

Then they started crapping out slowly, random restarts and freezes. Occasionally they wouldn't post and I'd have to reset the CMOS to default and apply my settings again.

So I went back to my Corsair 6400C4's (at 1:1 which is 430 @ 4-4-4 for me) and the system has been happy.

I then stuck them in another system I was messing with (e2160) and ran them at modest timings/speed... seemed all good for that purpose (I only had them at 416 with 4-4-4 timings) until Sunday the system rebooted and failed to post.

After that only one stick will post but I have to set the bios for 266 first. The remaining stick failed to post above 266.

Needless to say I RMA'd them today... we'll see how that goes.

I'm guessing I got a bad pair? Or did I fry them with too much voltage? I did have a fan over them the whole time, the never even felt warm to the touch.

Another question... anyone notice the heat spreaders don't make good contact with the chips? My heat spreaders seemed to be bowed out near the contacts so they wern't making good contact with the bottom 1/3 of the chips... maybe this is why mine died?