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Memory upgrade problem

I have a Gigabyte EP45-UD3R MB (F12 bios), Intel quad core 9550 processor, Win XP SP3, and 2X2 Gigs Corsair DDR2-800 ram. I recently bought 4 Gigs of Kingston Hyper-x dual channel DDR-1066 ram (2X2 gigs). When I installed the DDR2 -1066 ram and booted up the computer the bios shows the ram running at 800 MHz (2 x 400) and CPU-Z shows the dram as 400MHz, instead of 533Mhz. The CPU-Z SPD page also displays the ram as PC-6400, 400Mhz max bandwidth. I bought the ram brand new and the package says "4GB PC2-8500 CL5 240-pin kit (KHX8500D2K2/4G). Am I missing something here? I thought the bios "reads" the new ram and makes the necessary changes automatically. Thanks in advance for your help in this matter.
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  1. Best answer
  2. The SPD is probably programmed for 400 Mhz. so you'll need to manually set it in the BIOS to 533 Mhz.
  3. Are you running both sets of RAM? If so the MB probably sets itself to the slowest of the two.
  4. I am running the DDR2-1066 ram only. I made these 3 changes manually in the bios...

    (1) Increased the ram speed from 800-> 1066MHz
    (2) Changed the timings from 5-5-5-18 to 5-5-5-15
    (3) Increased the dram voltage from 1.8v to 2.2v

    CPU-Z now displays the freq ai 533 instead of 400 and everything is running fine. The voltage seems a little high to me. Can I drop it a bit without causing any problems?
  5. made some seach on the net most user run them on 2.2v.
  6. Best answer selected by rstefani.
  7. scout_03 said:
    made some seach on the net most user run them on 2.2v.


    Thanks Scout! I plan to leave it at 2.2v...no issues so far and Prime 95 hasn't reported any problems either.
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