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memory speed is only 400 MHz instead of 1066


OSNN Senior Addict
I have 4 sticks of (2 dual lots) of Kingston Hyper X (KHX8500D2/1GN) that are supposed to be running at 1066 MHz but according to HWinfo, Everest Ultimate edition & CPUz they are only running at 400.0 MHz

Can someone please tell me how to fix this or what is going, I am totally stumped. I'm not into overclocking but I would like to have the memory running at least close to what they are supposed to be doing

Any help appreciated

My system

Intel Core 2 Duo E6850 CPU
2 x 2 GB Kits Kingston Hyper memory 1066MHz
MSI P35 Platinum Combo
Creative X-Fi Titanium Pro Soundcard
Geforce GTX 285 Video card
Thermaltake 1000W Toughpower PSU
WD 250GB SataII HD
2 X Samsung 1TB HD
Compro T750 HDTV Dual Tuner PCI Card
Thermaltake Bigwater 745 water cooling
Samsung 226BW 22" monitor
Samsung Syncmaster 913 19" monitor


The One and Only
Well.... 400mhz, but it's DDR, so 800mhz. only way i can imagine getting it up to speed is browsing the BIOS settings and seeing what they're set to.

Admiral Michael

Michaelsoft Systems CEO
Well it's actually 800MHz. It's DDR (double data rate) so take the speed and double it. Also 1066MHz RAM isn't a standard so you would need to overclock your computer to get those speeds.
400Mhz is the front side bus speed (FSB), and like ElementalDragon said 400 x 2 (DDR) = 800Mhz on the RAM, which is as high as the JEDEC standard goes for DDR2, if you want 1066 you'll have to overclock it. Boot into BIOS and look at your CPU:RAM divider, it is probably running 1:1. You want the 1:1.3 divider if you have it (1.3 x 400 = 520 x 2 = 1040Mhz). 1:1.2 would be 960Mhz, and 1:1.4 would be 1120Mhz.

Alternatively, you could push the FSB of the CPU which will also push up the RAM's speed. (If you're running 400Mhz FSB with the 9x multiplier you are already overclocked to 3.6Ghz.) If you can get 430Mhz FSB out of the CPU you could use the 1:1.2 divider and get 1032 Mhz on the RAM. If you're afraid of pushing the CPU that far you can always drop the CPU's multi in combination with a higher FSB and stay near stock clock speed on the CPU. Hope something here helps! :)

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