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Memory upgrade problem

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August 17, 2011 3:41:12 AM

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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a c 156 V Motherboard
August 17, 2011 4:25:54 AM

see link for memory review and setting http://www.tomshardware.com/reviews/4gb-memory-overcloc...
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a b V Motherboard
August 17, 2011 5:36:04 AM

The SPD is probably programmed for 400 Mhz. so you'll need to manually set it in the BIOS to 533 Mhz.
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a b V Motherboard
August 17, 2011 4:16:19 PM

Are you running both sets of RAM? If so the MB probably sets itself to the slowest of the two.
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August 17, 2011 6:03:30 PM

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?
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a c 156 V Motherboard
August 19, 2011 9:47:25 PM

made some seach on the net most user run them on 2.2v.
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August 20, 2011 2:37:21 AM

Best answer selected by rstefani.
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August 20, 2011 2:42:56 AM

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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