Originally posted by bobafett573
woo woo woo slow up here. so what is it really being clocked at? am i at 333Mhz or 167.5Mhz? since it is DDR RAM, I assume the number is doubled.
You are "clocked" at 167.5 MHz. Similarly, DDR400 is clocked at 200 MHz. Personally, I hate this convention. But, the design gurus at the semiconductor companies wanted this, so who are we to argue
Hope it wasn't the damn marketting people
This is how the #'s work. I'll take DDR400 for example:
The ACTUAL clock rate = 200 MHz
"Effective clock rate" = 400 MHz
The "Effective clock rate" exists b/c DDR transfers stuff both on the rising and falling edges of the clock. This is in contrast to normal memory whch transfers stuff only on the rising edge - or falling edge depending on your point of view.
I haven't read the DDR spec yet. So I can't tell you more about "DDR" than from a "computer mechanic" viewpoint - as opposed to a design viewpoint. If you'd like, one question to research on would be, why they didn't just double the original normal clock rate and not have this "rising/falling edge" crap. And adjust the CPU multipliers accordingly of course.
Personally, I hate the "Effective clock rate" # as it just depends on the type of RAM - DDR in this case. It's so much easier for me to know the ACTUAL clock rate of 200 MHz for example.