F3-10666CL7D-4GBRH and another ASUS M4A87TD EVO

[mz800]

other specs:
AMD Phenom II X6 1055T
ATI 5770
std 600w psu
Samsung HDD

after sending everything once back to esupplier (only fans workin).
i was able to install win7 prem. 64 bit on it, had 2 crashes whist installing, but didnt cared bout.
2 day later i've random bluescreens, freezes, restart probs, even bios does not work proper most times.

1st. swapped PSU, gfx, hdd, from another spare machine -> not better.
tried other brand ram (not supported from M4A....)
but i did try the gskill ram, gfx and psu in the other machine and everything worked fine there. tried 1 ram modul (in each bank) same probs.
so mobo & ram & rest not faulty ... but together they wont work.

tried Asus settings 7-7-7-21
tried auto recognize.
increased nb & ram voltage (1,5 - 1,6)

im quite sure its bios settings. but which one and how?

any help and or suggestions would be really appreciated.

regards

michael

[GSKILL TECH]

Try one stick at a time. All you need to do is input 7-7-7-21 for this memory.

Thank you
GSKILL TECH

[Tradesman]

Sticks in slots 1-3, timings as you indicate 7-7-7-21, try DRAM voltage at 1.55, CPU/NB 1.25 and CR (Command Rate) at 2N