Hi, is there anyone here who is able to run 4*1gb ddr2 PC8500 at 1066mhz on ga-x38-dq6?

I've tried various settings but memtest+ test7 fails.
In 2*1gb configuration at 1066mhs there is no error...

Ram are adata vitesta extreme edition 8500+ (4*1gb)

Mch overclocking and raising Vdimm was useless.

Now my cpu runs at 333*9 (3ghz) but ram are now at 1000mhz and system it is rock solid.... what can I do?