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Ram speed problems [P55-UD3 | GSkill 4GB DDr3 1333]

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a b V Motherboard
April 2, 2010 11:09:12 PM

Hi all.
I've been having some issues with my new PC build.
It seems that my memory's speed is never above ~780mhz even though it is DDR3 at 1333mhz.
Apologies in advance for my idiocy, i'm quite new to building my own computers and manually setting it up.

Specs:
Intel Core i3-530
GSkill F3-10600CL9D-4GBNT 9-9-9-24 DDR3-1333 (PC3 10666)
Gigabyte P55-UD3

This was a budget build, just for playing a few games, but the ram speed is really bugging me, I can't seem to work out what's wrong.

Thanks in advance for any help.
CPU-Z Link: http://valid.canardpc.com/show_oc.php?id=1115751

EDIT: It seems that in the bios, the ram shows as 1333 but after the pc boots, it goes back to 666mhz.

Best solution

a b V Motherboard
April 3, 2010 1:16:33 AM

Your RAM is fine. Give this a read: MEMORY FAQ (please read before posting)

In particular, things to note:
DDR SDRAM: Double data rate SDRAM. The core-clock speed of a DDR SDRAM module is synchronous with the CPU bus, however data is sent on both the rising and falling edge of the clock signal effectively doubling the memory chip's throughput.


CPU-Z reports RAM differently than the manufacturers do. CPU-Z reports on the clock signal. Manufacturers like to make the numbers as high as possible so they count the rising and falling edge of the clock signal. I.e., to get CPU-Z reported number to equal the number manufacturers push you have to double what CPU-Z says. 666 x 2 = 1333 (approx).
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a c 295 V Motherboard
April 3, 2010 1:32:38 AM

Your RAM is fine. DDR means Double Data Rate, so, the speed that you see in the programs is correct, just need be multiplied by tow (2) and you get the 1333 of your RAM.

666x2=1333MHz, that is the speed of your RAM.
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a c 295 V Motherboard
October 10, 2010 3:30:19 AM

Best answer selected by saint19.
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