Question regarding FSB of AMD 2500+

[theRedMosquito]

I have KT4V mainboard and AMD 2500+. When I use fuzzy logic, my fsb is only 166, whereas it should be 333. My BIOS will not let me change it manually to 333. How can I fix it to 333? Do I not support 333? or is there some other issue? Thanks for the help.

 

[Nohr]

333 DDR just means a 166 FSB x 2. It's set correctly.

 

[theRedMosquito]

I thought that 333 was my fsb speed as well as my memory speed.

 

[Nohr]

Yes, but 333 is the DDR rating, which essentially doubles the actual MHz rating. It's all in how the DDR technology works.

133MHz FSB = 266MHz DDR
166MHz FSB = 333MHz DDR
200MHz FSB = 400MHz DDR

 

[VIAN]

In the beginning there was SDRAM. This type of RAM sent data once per clock cycle. DDR (Double Data Rate) SDRAM is now. This type of RAM sends data 2 times per clock cycle theoretically doubling the clock speed.

Thus,

DDR SDRAM 133MHz = SDRAM 266MHz

Although, in my opinion, it should be referred to by the clock speed, people use the theoretical speed, using SDRAM as a comparison. Thats why you see that they market your Athlon's FSB as 333MHz when in actuality it is only 166MHz.

 

[pspada]

for reference, DDR exists because they figured out how to use both the rising and falling side of the clockcycle.

 

[pspada]

double post