I have 4 sticks of OCZ 1066 DDR2 simms 1GB each I can use any 2 sticks and run memtest64 for at least 5 cycles (about 3 hours). However if I use all 4 simms at 1066. 800 or 667 the test will fail after about 10 to 15 minutes. I tried bumming up the voltage on the RAM from 2.20 for 2 sticks to as high as 2.35 volts for 3 sticks without any success. Any ideas?

Bios version P5W-DH-ASUS-Deluxe-2004,and FSB 330

Thanks,
ERIC