Low Windows Performance Index

i built my first pc yesterday. i thought i really loaded it up, but my windows index is a pathetic 4.5. could anyone explain to me why with 6 gigs of ram my score is a 4.5? heres the pc...............

Mainboard : EVGA nForce 750i SLI
Chipset : nVidia nForce 750i SLI SPP
Processor : Intel Core 2 Quad Q9450 @ 2666 MHz
Physical Memory : 6144 MB (3 x 2048 DDR2-SDRAM )
Video Card : NVIDIA GeForce 9800 GTX+
Hard Disk : WDC (320 GB)
DVD-Rom Drive : PIONEER DVR-113NP ATA Device
Monitor Type : Gateway FPD1975W - 19 inches
Operating System : Windows (TM) Vista Ultimate Professional 6.00.6001 Service Pack 1
DirectX : Version 10.00
Windows Performance Index : 4.5
:no:

This may happen because sometimes the system does not recognized the one of the memory stick, please remove all your memory stick attached to the computer system, again reconnect that,this may result in recognition of an additional memory stick...
here you may also have the forum discussion with the similar topic:
http://forums.techarena.in/operating...ms/1137940.htm

Have a look at what CPU-Z is reporting - see how all sets of RAM are actually being utilized.

In my experience, increasing my 4GB PC6400 RAM to 6GB PC6400 RAM cause a drop of 0.2 (5.8 -> 5.6) in the WE Index. I think this was because I'd dropped from 4-4-4-12 to 5-5-5-18. Tightening the timings a little allowed me to pull back to 5.7, but I haven't investigated further.

Nevertheless, it seems that beyond a certain amount, quantity is not an issue, but timings are.

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