Question about OC'ing

[subnetrx]

I've never overclocked a system before, but noticed in my new Abit KN8 Ultra BIOS that my FSB speed is 200mhz, and the multiplier is 9x. Is it as simple as setting the multiplier to 10x for a 2.0ghz overclock, or will I have to overclock memory as well? I read the forum sticky, but I don't want to overclock to the max, but just put my foot in the water as far as OC'ing goes.

 

[hurtstotalktoyou]

You can lower the multiplier, but not raise it.

Here's how to overclock: leave your multiplier at 9x and set your FSB to 240 MHz. This will give you a 360 MHz (20%) overclock. However, in order to protect your memory, set the RAM speed to 166 MHz (it will actually run at 200 MHz, which is perfectly safe). Also, lower your hypertransport multiplier from 5x to 4x.

Simple!

 

[subnetrx]

Thanks, but why do you lower the RAM speed?

 

[Relion]

You are not really lowering it...if you run your CPU @ 240, ram would be running @ 240 as well (only very good memory can do this, supposing u using PC3200 (200Mhz))...so instead if you run it @ 166Mhz (83%) you are running it @ 240 * 0.833333 = 200Mhz...as it is supposed to run...thats called run on a divider...

 

[Leper Messiah]

Originally posted by: Relion
You are not really lowering it...if you run your CPU @ 240, ram would be running @ 240 as well (only very good memory can do this, supposing u using PC3200 (200Mhz))...so instead if you run it @ 166Mhz (83%) you are running it @ 240 * 0.833333 = 200Mhz...as it is supposed to run...thats called run on a divider...

aye. I really wished they stickied my RAM divider calc thread, the equation is a little difficult to type out off the top of my head, but it goes something like this: RAM speed = R, CPU speed= C, ram divider expressed as a decimal= [/b]D[/b] CPU multiplier (rounded up if using .5 multis)= M. So... R=(C/[M/D]) or something like that. 200=(1800/[9/1]) works out, and 200=(2160[9/.83]) works out too I think. So there you go. You'll want to lower your HTT multi because any value over 1000 is going to induce instabilty in your computer. Lowering it doesn't have any effect on your performance either. 🙂

 

[subnetrx]

Thanks a lot for the explanation. I was afraid I was about to get flamed. Most articles I find are outdated or try to combine new overclocking information with old information.