Comment 86 for bug 157777

My 64bit Ibex system seems stable after changing SDRAM timings in the BIOS - sticks were advertised as 4-4-4-15 so that's what I originally manually set them as. After I posted above on 9/21 I changed BIOS settings to "Auto", which selects 5-5-5-15 timings & it has been stable under Ibex64 Alpha 6 ever since - difference is dramatic. Not sure if this fixes the root cause of my problem or if it's just masking it; 4-4-4 timings were not a problem under 32 bit Ubuntu/Win32/Win64 (all stable under heavy CPU/IO loads whereas 64 bit Hardy & Ibex were not) & I had previously run memtest w/ 4-4-4 timings w/o errors. Can anyone else repro 64bit instability?