667 Mhz and 800 Mhz

Now i use 2GB DDR2 667 MHZ under Windows 7.
Later,I have bought a new one 2GB DDR2 800 MHZ..
But,the new ram seem smaller than the old ram..About half of size than the old one..
Then,When i put the new one together,it cannot BOOT as usually..The red led light on my cpu..
What Should i do???

My Specs:


AMD Athlon 64x2
ATI Radeon HD 4650 1Gb
PSU:420 Watts

Sorry my english not good..
6 answers Last reply Best Answer
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  1. Best answer
    Is the DDR2-667 one 2 Gig stick also?
    Have you tried to boot only with the new RAM?

    If the old RAM is two 1 Gig sticks, Try the 2 Gig stick in slot 1 and the two 1 gig sticks in slot 2 and 4.

    If both are 2 gig sticks put the DDR2-800 in slot 1 and DDR2-667 in slot 3.
  2. No,My old ram was 1 stick 2Gb 667 MHZ only.
    My MOBO have only 2 slot...
  3. No,My old ram was 1 stick 2Gb 667 MHZ only.
    My MOBO have only 2 slot...
    Revove from the list of quoted messages Add to the list of quoted messages Quick edit Edit this message
  4. i have try booting with the new one ram..but it cannot boot...The red led light on again!!!
    My new ram is smaller than old one..about half size than 667 Mhz..
    Please Help Me....
  5. Best answer selected by Hadismkay.

    Is this the difference in size?? If so the smaller RAM is for a laptop and the larger is for a desktop.

    Laptop uses 200 Pin DDR2 and a desktop uses 240 pin DDR2.
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