How can i get my ram the speed its supposed to be at?

Ok. where to start? I have a PN6 SLI 650i motherboard and a e6600 processor at the stock of 2.4ghz. I used to have in 2gb of 400mhz Ram and that was really slow and dragging down my performance in my games, so i decided to upgrade. I looked into what my motherboard can support and i got the best upgrade i could get: Gskill 4gb 1066mhz ddr2 memory (see link below)

I had some problems getting this to work. first off, when i started up XP it said i had 3gb of memory installed instead of 4gb but cpuz said i had 4gb of memory...but they weren't running at full stock speeds (1066). instead they were running at 800mhz.

i went into the bios and changed it from "linked" to manual and edited the mhz to 1066 and when i rebooted, the screen went black. It took me awhile to figure out how to reset the defaults again. (unplugged power and waited). I don't understand. Everything is good, the mobo supports it, the ram should be working at its full potention but its not and i need help. I don't know much about overclocking, do i have to mess with the CS or something like that? the voltage?


not sure if this is helpfull but my fsb is at 1066 right now, so can you not have your fsb speed matching the same speed as your RAM speed?
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  1. You have to manually set the ram up, that includes changing the voltage to the new values.

    Windows 32bit will always shopw less than 4gb of memory, as a 32bit system can't allocate 4gb of ram.
  2. do u have windows 64bit or 32 bit?
  3. Two OC How-to's:
    HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1

    Core 2 Quad and Duo Temperature Guide

    Next, google something like "overclock 650i" or for your particular mother board.

    1066 is not your memory's "stock" speed. There is no JEDEC standard for anything past DDR2-800. All DDR2-1066 RAM is is DDR2-800 RAM that has been tested to run at 1066 speeds.

    To run the FSB:mem clock ratio at 1:1, the mem clock needs to be twice the FSB (DDR2 remember?).

    And if it were easy, anyone could do it.
    Overclocking since 1978 - Z80 (TRS-80) from 1.77 MHz to 2.01 MHz
  4. Just a minor correction jsc:
    jsc said:
    ...the mem clock needs to be twice the FSB (DDR2 remember?).

    The 2 part is not the doubling factor. DDR stands for Double Data Rate. As an example: DDR3 is double as well (not tripled).
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