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Thread: amd fsb




  1. #1
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    Jan 2004
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    i am having overwhelming difficulty trying to figure what the deal is with amd's fsb. i don't understand when amd says " we would like to clarify where the 200 and 266 MHz front side bus speeds come from. All Athlon CPUs use a "double data rate" that doubles the amount of data that is sent and received on the front side bus signal. The front side signal can be either 100 or 133 MHz, thus the CPU's front side bus can be 200 or 266 respectively." and they issue with the ram. does this mean that if you have 333mhz ram you can only run the fsb at 166mhz? im sorry but i have heard so many different things. can someone clear this confusion. thanks

  2. #2
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    That is correct, the actual FSB speed is 100, 133, 166, or 200, and they will be labeled as 200, 266, 333, or 400 because it is double pumped.

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  3. #3
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    Quote Originally Posted by Cicero
    i am having overwhelming difficulty trying to figure what the deal is with amd's fsb. i don't understand when amd says " we would like to clarify where the 200 and 266 MHz front side bus speeds come from. All Athlon CPUs use a "double data rate" that doubles the amount of data that is sent and received on the front side bus signal. The front side signal can be either 100 or 133 MHz, thus the CPU's front side bus can be 200 or 266 respectively." and they issue with the ram. does this mean that if you have 333mhz ram you can only run the fsb at 166mhz? im sorry but i have heard so many different things. can someone clear this confusion. thanks
    If you think that's bad then wait till a have a go a Intel's quad pumped bus (FSB frequency x 4 for effective data rate).
    Now if ya have DDR333 memory the spec'd rate is 166MHz but usually that can be exceeded by a few MHz. Also with the right motherboard and a CPU that is either unlocked or the mobo can unlock it then ya can also drop the multiplier and step up the FSB to the next level. For example I have 2 PC's with nForce2 based motherboards, one is a Thoroughbred "B" cored XP2000+ which at stock runs at 12.5 x 133MHz but with a good HSF and raisin' the core by 0.1v plus with PC2700 (DDR333) I've got it runnin' at 12.5 x 175mhz (2.19GHz and I was lucky as I didn't need to drop the multiplier). The 2nd one uses the same mobo but uses PC3500 (DDR433) and an XP2600 which at stock runs 12.5 x 166MHz but atm runs 11.5 x 200MHz (2.3GHz) though on odd occasions I lift the FSB to 220MHz for 2.5GHz (to noisy and warm to run this speed 24/7 though). I hope that helps ya out a bit more.

  4. #4
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    i think i want to die now

  5. #5
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    Quote Originally Posted by Cicero
    i think i want to die now
    ???

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