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Mixing 5-5-5-12 and 5-5-5-18 memory.


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I currently have the following system


• Asus P5N32-E Sli

• Intel Core 2 Quad Q6600 2.4Ghz

2GB from 2 x 1Gb Corsair XMS 2 Twin2x2048-6400 800Mhz DDR2 Memory 5-5-5-12

• Windows XP Pro (32 bit)

• 2 x Nvidia 8800gt Sli

• ******** Toughpower 750W PSU


I am wanting to go up to 4Gb in order to replace the operating system with Windows 7.


The only memory I can find to add another 2Gb of memory is the same Corsair Twin 2x2048-6400 but the latency is 5-5-5-18.


Would this 5-5-5-18 memory work OK with my existing 5-5-5-12 memory?


The forums seem to says that dropping the memory speed to 667Mhz may help as shown here


Would it be better to simply replace the existing 2Gb of memory with a new set totalling 4Gb?


Thanks for any help.

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