Hi,

I just assembled my new pc but have a problem: I bought 1066mhz ddr2 ram but they seem to work only at 800.

This are the parts:

CPU: AMD Athlon64 X2 6000+
Motherboard: Gigabyte GA-MA790X-DS4
RAM: 2GB Geil PC8500 (GX22GB8500PDC)

I read on the gigabyte site that for my motherboard, 1066mhz speed is supported depending on the cpu installed.
Could it be my cpu? I think it should be fine...
I also updated the bios but nothing changed.

Can someone help me understand why my RAM can't go 1066?
What should i do?

thank you

.....64 x2 6000+ uses an odd-numbered CPU multiplier and the memory clock is derived from the CPU clock..it uses the CPU/8 divider to derive its fsb (eg. if cpu=800mhz ram=667-800mhz)So try overclocking the Cpu fsb to 1066-1333mhz and maybe you'll get a ram fsz of 1066mhz

thank u I'll try to overclock the cpu with easy tune and see if anything happens.
In fact, last time i monitord cpu clock was 1000mhz, maybe not enough to support 1066mhz memory ram.

yup...last time i ran a cpu fsb @ 1000mhz..i only get a 833mhz ram max

AMD CPU's don't have a FSB. The memory controller is built into the CPU & is designed to run at 400MHz (DDR800). If you want your RAM to run at 533MHz (DDR1066), you'll have to overclock the CPU. But I doubt you'll get the RAM to run at full speed...you'll have to play with the CPU multiplier & CPU frequency to see what you can accomplish. Also, make sure to keep the HyperTransport bus as close to 1000MHz as possible...lower is fine, just don't go significantly higher.

As much as I don't want to sound like a lick, some of you people really need to read up more on the diff between intel and amd before giving advice. Quar, i'm sorry but you gave totally wrong advise. Like Jam said AMD 64's don't have FSB.

quarantinedjk, jam and cobra_r are all partially right. But they should read a little more also.... (no offence)

AMD AM2 CPU can only support upto DDR2-800 memory speed, so, no matter how fast your memory is, it will be at DDR2-800. Unless you overclock it. But doing that you need to abide by the odd multiplier problem in AMD AM2 cpu....

http://www.anandtech.com/cpuchipset...

thank you everyone.
actually I decided not to change my setting so to avoid damage to my pc.
In fact, it goes great even if ram speed is 800.

Just to understand if I got it right: in order to have my ram going faster at 1066 I should upgrade my cpu with, for example, a AMD Phenom cpu processor, isn't it?

thank u again

"in order to have my ram going faster at 1066 I should upgrade my cpu with, for example, a AMD Phenom cpu processor, isn't it?"

No. Re-read the above comments.