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I can't make sense of my max frequency readings

Last response: in Memory
September 24, 2010 4:57:52 AM


I'm having this problem for which I can't find no answer:

CPU: AMD Athlon 64 x2 5000+ Black Edition (no OC)
Memory: 2GB 667MHz DDR2 ECC CL5 DIMM (Kit of 2)
OS: Windows 7 x64 & Windows Vista x86

OK, as far as I can understand, this is all compatible, right? My problem is that since ever I first installed these two memory cards (which should supposedly max at 667MHz each) I can't seem to go past 333MHz each according to my BIOS, CPU-Z and AMD CPUInfo.

What's going on? Am I missing something here? Why can't I get frequencies higher than this?

I read my MB manual carefully before upgrading the memory and it says it can handle up 667MHz ECC. The CPU is also supported by the MB perfectly, so I guess it can't be that the CPU won't run past 333MHz either. Actually, I can't find that bit of info anywhere, so it's just a guess based on the mutual compatibility with the MB... :sweat: 

I don't know. Any ideas? I can't crack this one.

a b } Memory
a b à CPUs
September 24, 2010 10:41:46 AM

Ha :) 

Double Data Rate means you double the frequency to get the "actual" frequency. You shouldn't have worried about it.

That clears things up?

Best solution

a b } Memory
a c 172 à CPUs
September 24, 2010 11:05:57 AM

the_punkinator is kind of right.

The following is an excerpt from an old post I did.

"Using the Q6600 as an example, the FSB frequency is 266 MHz. The matching DDR2 memory clock for that frequency is 533 MHz (266 X 2). DDR2 memory transfers two chunks of data for each bus cycle, hence double the frequency. Each bus cycle generates 2 memory clocks. So, to run 1:1 at an FSB of 266 MHz, we need DDR2-533 RAM.

What CPUZ does is a little confusing. It will tell you that the memory frequency is 266 MHz for a 1:1 ratio. "

In the computer business, there is a big difference between frequency and clock.
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September 24, 2010 3:59:22 PM

Ah, great!

I knew it had to be something stupid like that.

October 1, 2010 7:58:26 PM

Best answer selected by aguilacuervo.