I used to be able to run my rig @ 3.2ghz with 2gb Corsair Dom. 1066 @ 1068 - stable. 5-5-5-15 then I added more ram........2 sticks of 2.2v and 2 sticks of 2.1v.
With 4 x 1gb Corsair 4GB DDR2 XMS2 Dominator PC2-8500C5 TwinX I'm at 3.3 or 3.4ghz ~880 on mem (SPD only). I cant boot on 5-5-5-15. Bios 14. vdim @ 2.275 which shows as 2.2v in Everest.
Im happy with 8x425 - 3.4ghz (64c load) and 4x1gb though. Any more from that setup for me will be a new system.
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Antec Sonata 3 (Earthwatts 500psu)
Abit Ip35-pro (ver. 1.0 board running bios 14 with bolt mod) Silent otes removed and re-applied with mx-2.
Q6600 (v1.265) running at 3.4ghz -- lapped.
Noctua HS and PF12 fan (not lapped - bolt thru mod) w/MX-2
Scythe Slipstream 1900 (11v) rear exhaust fan
Scythe Sflex 120mm - 1600 intake.
MSI - 8800gts (g92) - stock oc/ver @730. with Accelero s1 rev2, load 59c
Asus d2x (I left that alone
Pioneer 212 & 215 dvd r/ws
x1 500gb Seagate
x1 320gb Seagate
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