Help, 4*2gb memory problem with Gigabyte P35C-DS3R

Ever since I upgraded my 4*1gb A-Data Vitesta Extreme Edition DDR2-800+ ram
to 4*2gb OCZ Reaper 1066 mhz DDR2 (OCZ2RPR10664GK),
I began having problems of lots of BSOD.

I ran mem-86 3.5 on the rams.
With only one ram on the slot rams check out OK.
But when I run mem-86 with 2 or 4 ram slots loaded the program freezes.

I thought this may have to do with the bios. I had bios version version F10.
http://www.gigabyte.com.tw/Support [...] uctID=2631
I downloaded and flashed F12e (beta). This didn’t help.

Actually my Gigabyte P35C-DS3R was very unstable until bios version F10.

My OS is Vista Ultimate 64 bit. Graphic card is ATI HD 2600 (driver version 9.4-latest). Power supply is sufficient (PC Power & Cooling Silencer 750)

Anybody encountered a similar problem?
Please help…

I had thought EPP would take care of ram voltage…
Bios is loaded with optimized defaults, to be on the safe side.

Looking at the bios I see
DDR2 Voltage 2.080 V
Memory frequency 1066 mHz
Cpu host frequency 266 mHz

CPU-Z tells me
Frequency 533 mHz
FSB/Dram 1:2
Timings 5-5-5-15 - 2T

BTW, my cpu is quad core Q6600 (2400)

OCZ rates this ram for 2.1-2.2V
http://www.ocztechnology.com/produ [...] gb_edition

2.080 V seems to be close enough… Maybe I should try ~2.15V… (?)

I get BSOD especially when my PC wakes up from “sleep”.
Thank you.