In all reviews and stuff i see on pages for DDR memory and prcessors (Althlon XP's) it tell me the FSB of the processor is 266Mhz and the memeory is 266Mhz also, but in my bios i got 133 Mhz FSB for my Xp 1900, not 266mhz
also i dont know that amount of mhz my memory is running at plz help me, tell me the diff
n00bie
AMD XP 1900+ @ 1644
512 Mb PC2100 DDR
80Gig IBM Deskstar 7200rpm (2 x 40 gig RAID 0)
120gig Maxtor 5400rpm
Leadtek GF4 Ti4600 @ 321/735
DDR stands for double data rate. So ur system is running at the rite specs. The front side bus is clocked at 133MHz and when double pumped equals to 266MHz. I think DDR data is sent on the rise and fall of a clock cycle...but i myte be off on that.
Same case with ur memory. PC2100 is speced at 133mhz but should give u 266mhz double pumped.
Correct, the clock is 133MHz, but as it transfers at both the rising and falling edge(DDR) of a cycle, it effectively works as a 266MHz bus. Although adresses still only transfer in 133MHz. Thats one of the reasons performance doesnt scale like one thinks it should.
And just for completeness, the P4 is a QDR system, that means it passes 2 bits on each rise or fall, kinda sorta. I know it's like degrees in the cycle but it's late here and my mind doesn't stretch that far back to electronics 101.
No wonder television's a medium. It's so seldom rare or well done. -Mighty Mouse
its more math then electronics 101. Sin curves separated by degrees so one rise may be offset from another rise even though both signals is derived of the same clock signal. IIRC. But i dont have that especially fresh in my mind either.
So really... whatever it is,, and what fancy name they use.... its fast.. it works. Thats fine for 99% of all people.
