Why is my 1600MHz RAM only running at 667 MHz?

riol · Jun 11, 2014

I have a pair of Ripjaws X 16Gb 2x8Gb 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231568&cm_re=ripjaws_x_16gb_1600-_-20-231-568-_-Product

all 16 gigs are detected and are usable but i am wondering why the speed is only at 667. Any ideas?

Thank you!

ASRock 990FX Extreme9
AMD FX8350

rgd1101 · Jun 11, 2014

it running at DDR3-1333
http://en.wikipedia.org/wiki/DDR3_SDRAM#Modules

which is standand on the motherboard
http://www.asrock.com/mb/AMD/990FX%20Extreme9/?cat=Specifications

boju · Jun 11, 2014

Memory diagnostic tools and operating systems show memory value in single date rate, that is normal. If you enter bios, will show you the double data rate there.

From that picture, your memory is operating at 1333Mhz double data rate like rgd1101 says. Task manager in the picture is not precise enough but is showing 667Mhz x 2 = 1334, close enough.

Check your bios, might have to either enable AMP - AMD Memory Profile or force memory to run at 1600Mhz. It will show as 800Mhz in your task manager but long as your bios is telling you 1600, its what it shall be.

Tradesman1 · Jun 11, 2014

Set the DRAM to 1600 manually or look for and use XMP, DOCP or EOCP in the BIOS, find whichever the mobo uses, enable it and select the 1600 freq....all mobos take DRAM at the mobos default then if DRAM spec is higher you set it to proper freq

boju · Jun 11, 2014

its weird, its probably easy for someone knowing what to do, but when a motherboard specifies something should be native it shouldn't be a hassle.

Anyways that motherboard should be 1600native at default, shouldn't even need to enter bios besides adjusting boot order, well memory specs for it says DDR3 2450(OC)/2100(OC)/1600/1333/1066 Bit odd. We'll see when riol gets back.

Tradesman1 · Jun 11, 2014

All that is saying is that no CPU or MC OC should be required up through 1600, the mobos true default freq is prob 1066 or 1333, which it will default all new sticks to when first installed

riol · Jun 12, 2014

hello, thanks for your responses. i didn't find anything about XMP, DOCP or EOCP in the UEFI. I checked it again, using CPU-z this time.

but why does this other tab says that it's maximum bandwidth is 667?

Tradesman1 · Jun 12, 2014

Ok, the freq shows you are running 1600 (actually 798.2 x 2 - 1596.4 as it's Double Data Rate), and don't worry about the Max Bandwidth - that's simply showing the default boot of the stick, CPU-Z can be odd, have an info thread on it here:

http://www.gskill.us/forum/showthread.php?t=10565

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Why is my 1600MHz RAM only running at 667 MHz?

riol

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