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With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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I just put in the two sticks of TWIN2X4096-6400C4DHX into my ABIT IP35 Pro running Vista 64 bit. I ran CPU-z and it came up with the following timings and speeds.


Timings table

Frequency (MHz) 270 400

CAS# 4.0 5.0

RAS# to CAS# delay 4 5

RAS# Precharge 4 5

TRAS 13 18

TRC 16 23


EPP profile 1 (full)

Voltage level 2.100 Volts

Address Command Rate 2T

Cycle time 2.500 ns (400.0 MHz)

tCL 4.0 clocks

tRCD 4 clocks (10.00 ns)

tRP 4 clocks (10.00 ns)

tRAS 12 clocks (30.00 ns)

tRC 22 clocks (55.00 ns)

tWR 8 clocks (20.00 ns)


My question is why are they running at different speeds and voltages, how or should I try to even them out to both be at 400 mhz? Thanks for any help.

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