CPU Bus speed changing

[TobyH]

I'm in the process of starting the overclocking of my system,again, and I was wondering if there are set frequencies that I should use as I increase the values.

The reason for asking is that I had set the value to 233 MHz and then went to 245 MHz, the computer wouldn't start and defaulted back to the 200 MHz standard value. I then tried it at 266 MHz just to see how it worked and it booted up fine.

Is there a reason for this that I've missed? In the guide on here it says increase by 5 MHz each step (yes I've gone a little more than these steps) but that would mean that there's no reason the 245 MHz shouldn't work...

Can someone explain this for me?

 

[TobyH]

The platofrm is the follwing:

Gigabyte GA-G31M-ES2 FSB 1333 Mobo

CPU is Pentium D945 dual core 'Presler' 3.4ghz

Kingston 2 x 2gb DDR II Hyper 1600 Ram


The bios does have an o/c mode, but I think from what I've seen of other peoples bios it is a little more limited in what I can change. Voltages have been set to 'Normal' rather than 'Auto' so I'm pretty sure they aren't changing when looking at speedfan screen.

I've left it testing today while I'm at work at 266Mhz with the ram fsb at std setting with std voltages. Will see how it's going. CPU temp is only around the 35'C mark so I'm not too concerned with that at the moment, especially with the massive Noctua heat sink and fans.

 

[TobyH]

Another quick question.

In my bios I have a very limited ram divider (4+, 3.33, 2.66 or Auto), and a mulitplier that goes up to 17. When I'm checking for max CPU clockspeed should I be reducing the multiplier as well as the ram divider or leave it at 17 (which is std)?

Cheers
Toby