DDR 1600 Running at 667 MHZ * 2 - Don't think it's a CPU limitation

[JZR]

Hello - I have 2x2 Corsair DDR3 1600 MHZ. According to Speccy, they're running at 667 MHZ. I have read through some of the forums - and when others have asked the question, they have been told that they're CPU limits the speed of their RAM. I don't think that's the case with me - but I am no expert.

 

Here are some selected speccy results. I can't cut and paste - so I'll try and copy relevant items. Please let me know if I missed something important.

 

CPU -

AMD Athold II X4 635

Cores 4

Bus Speed 200.9 MHZ

Rated Bus Speed 2008.9 MHZ

Stock Core Speed 2900 MHZ

Stock Bus Speed 200 MHZ

 

RAM

Type: DDR3

Size: 2048 MBytes (x2)

ManufacturerL Corsair

Max Bandwith: PC3-10700H (667 MHz) - (I don't think this is the correct model number; I'm fairly certain I purchased 1600 MHz which should be running at 800)

Frequency 666.7 MHz

CAS# Latency 9.0

RAS# to CAS# 9

RAS# Recharge 9

tRAS 24

tRC 34

Viktage 1.500 V

 

The moherboard is a Gigabyte GA-880GA-UD3H

 

Thanks for your help.

[trackrat]

The maximum RAM frequency officially supported by AMD CPUs is 1333 MHz. 667 MHz. is correct as double data rate RAM runs at 2 times the listed speed so 2 x 667 = 1334 MHz.

[Wired]

trackrat: there are some AMD CPUs which support 1600 MHz memory, but I'm not sure which ones.

[trackrat]

OK well AMD says the AM3 socket only officially supports DDR3 up to 1333 MHz. and on the AM2+ DDR3 up to 1066 MHz. RAM speeds.

 

http://www.amd.com/us/products/desktop/processors/athlon-ii-x2/Pages/AMD-athlon-ii-x2-processor-model-numbers-feature-comparison.aspx

[Wired]

Good find. Could've sworn I heard Yellowbeard say otherwise though. Left him a msg so we'll see what he says.