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OC w/unmatched memory - 2 dimms (TWIN2X1024A-6400) & 2 dimms (TWIN2X2048-6400C4)

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Hello, when I built my system (Core 2 Duo E6600 Conroe 2.4GHz with an ASUS P5W DH Deluxe Mobo) about a year ago I built it with the following 2 dimms:


CORSAIR XMS2 1GB (2 x 512MB) DDR2 SDRAM 800 (PC2 6400)


Timing 5-5-5-15

Voltage 1.9V


A little while back I saw a good deal on a good memory upgrade so I bought and installed the following 2 additional dimms:


CORSAIR XMS2 2GB (2 x 1GB) DDR2 SDRAM 800 (PC2 6400)


Timing 4-4-4-12

Voltage 2.1V


Now I want to OC my system, so armed by reading through online articles and this forum for a few hours I went into my BIOS and tried a few different things until my POST displayed that I was booting at 2.6GHz processor speed and PC2-6400 (I made sure to set my mem voltage to 2.1V). However, when I went and looked at my information in CPU-Z, it posted the following timings:




I understand that it should run at the slower timing of 5-5-5-15, but why is it running even slower than that? Before I changed the Bus speed from 266 MHz to 289 MHz the BIOS was on an "auto" OC profile and it ran the mem at PC2 5300 I think, and the timings were the appropriate 5-5-5-15. Is 5-5-5-15 just incompatible with the higher bus rate or does this have to do with the fact that I have 2 different types of different memory dimms? I noticed most other people are using all matched dimms, so I'm not sure if thats causing any of my trouble. Thanks for any help, I'm new to this! :D:

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