What is happening with my overclock?

[LIVAN]

Ok here is what I am using..

ABIT KT7A
TBIRD 1.2 GHZ
512MB PC133 Ram

I am able to run this ram at 148mhz x9 = 1333 MHZ with Prime 95 for 24 hours.

When I turn it to 149mhzx9, Prime 95 fails

So I conclude my ram can run at 148mhz

But when I try to run this thing at 148 x 9.5= 1397 mhz...Prime 95 fails in 5 minutes

But I am able to run 142x10=1420 mhz for 24 hours as well...

What is going on?

Why can't I do 148 x 9.5 when the Ram runs 24 hours at 148x9? ANd the Chip can obvious do over 1400mhz.....

 

[Demonicon]

OC'ing your FSB is alot harder on your components than just a straight multiplier OC, BTW i'd take the FSB down a notch and see if you can't get it stable at 9.5x147 and so on.

If you can't get anything other than what you mentioned stable, i'd stick with the FSB OC 1333.

 

[VBboy]

Even if it looks like your system can take 148 MHz FSB, you should still go down a couple of MHz just to be safe.

 

[LIVAN]

Yes but I ran 148x9 for 24 hours so that means my components can withstand teh FSB overclock. And My cpu can do over 1.4ghz But Why can't I do 148x9.5? When I can do 148x9 for 24 hours ?

 

[Jiggz]

I've noticed this on my system too. So I have jumped to the conclusion anything above the 9X multiplier Athlon CPU seems to be more sensitive and at the same time unstable. You will notice AMD does not use the .5 multiplier on its cpu's above the 9X. So the best overclocking spot for you is to stay at 142X10.