Athlon 64 multiplier

[imported_MadHatter]

I've noticed most people use a whole number multiplier when overclocking Athlon 64's. This is my first time OCing an Athlon 64 (I had a Barton 2500 at 12.5x192) and I was wondering if using decimal multiplier had any negative impact.

 

[Lonyo]

I think there can be some issue with them (ie: they don't work properly), but I'm not 100%.

 

[Leper Messiah]

it doesn't affect stabilty, but it runs your ram a little slower, since the way the A64 calculates ram speed is a little weird.

Ram speed is equal to CPU speed divided by the result of dividing cpu multiplier by ram divider, or RAM= CPU/(Multi/divider)

For a 3000 at stock, that would be 200= 1800/(9/1)

For stability purposes the formula rounds up your CPU multiplier when calculating RAM speed
say you want to run 8.5x300 (2550) with a 133 divider. 2550/(9/[.66])= 186Mhz or so.

Basically, if your CPU will let you, you might as well run the next highest whole number. Your ram will stay the same, and you get the extra CPU speed.

 

[imported_MadHatter]

Thanks for the info. My system is currently at 240 HTT x 11 with a 5:6 divider. I didn't really want to overclock my RAM but I know it's capable of at least 220 MHz (I had some stability issues though). I'll just go with 12 x 240. Thanks again!