Which way is better? 150FSB x 9.5 or 10.5 x 133FSB

[Kroze]

I have an Iwill KK266 Raid mobo and able to clock it to around 1.4GHZ.

Which way should i overclock it?

150MHZ FSB x 9.5 multiplier @ CAS 2-2-2 -Interleave 4

or

133MHZ FSB x 10.5 multiplier @ CAS 2-2-2 Interleave 4

I have 256mb PC150 of Tonicom Ram bought from and overclocker store.

 

[CrimsonWolf]

If it's stable, go with the higher bus speed.

 

[Sugadaddy]

The higher FSB will perform better at the same speed...

 

[Insane3D]

FSB speed and memory bandwith have much more of an affect on system performance than raw mhz..especially over 1ghz or so. I was able to run my 1.2ghz thunderbird @ 1.45ghz with a 161mhz FSB or 1.4ghz with a 165mhz FSB on my KK266-R...I chose the 165hz FSB and less mhz. 🙂

 

[VBboy]

Higher bus speed is much better, because your memory runs faster, and the memory is one of the biggest bottlenecks (not counting the HD, of course). However, your AGP and PCI speeds will rise accordingly, so you will be unvoluntarily overclocking your videocard and any PCI devices you have. Some motherboards will use a higher divider (1/5 instead of 1/4 for PCI, for example) when you go over a certain FSB speed (166 Mhz for the Epox 8K7A).

** Edit: I was not able to get my Epox motherboard to do 1/5 even after a BIOS flash...

 

[Insane3D]

"Some motherboards will use a higher divider (1/4 instead of 1/3 for PCI, for example) when you go over a certain FSB speed (166 Mhz for the Epox 8K7A)."

It is actually a 1/4 PCI divisor @ 133mhz on most boards (133/4=33). The Epox was rumored to have a 1/5 PCI divisor that kicked in @ 166mhz (166/5=33), but this has proven to not be the case. It still uses a 1/4 PCI divisor above 166mhz... Unfortunately, AMDMB.com keeps this rumor going by saying this is a feature in the newer 8K7A bioses...🙁

 

[Kroze]

should i change my voltage as well? I don't know what's the default is for the 1.2 amd. I have it set to auto.

 

[CrimsonWolf]

<< should i change my voltage as well? I don't know what's the default is for the 1.2 amd. I have it set to auto. >>



Only change the voltage if it is unstable. Otherwise, it will just produce excess heat.

Edit: Also, I believe the default voltage is 1.75 volts.

 

[jeffrey]

The 150MHz fsb is better for overall system performance, but the 133fsb speed might be easier to acheive/more stable.

 

[Insane3D]

&quot;should i change my voltage as well? I don't know what's the default is for the 1.2 amd. I have it set to auto.&quot;

The default voltage for that CPU is 1.75v. You should only increase the CPU's voltage as a last resort to stabilize a CPU that is overclocked to it's limits. The best thing to do when overclocking is to keep bumping the speed in small increments and testing for stability at each speed. Keep doing this until you reach a point where you start to encounter some instability, then raise the voltage a notch to see if it stabilizes it. Try to not go over 1.85v unless you have really good cooling. A common thing people do when overclocking is to raise the CPU coltage first..and all that does is add extra heat to the CPU like CrimsonWolf said..🙂

 

[Kroze]

Bah system crashes @ 150 x 9.5. I'm settling right now on 142 x 9.5 - CAS-2-2-2 Interleave 4. 1350MHZ isn't that bad i guess.

 

[soulm4tter]

joo try 150x9=1350?

or even 153x9=1377

do you think the ram, chipset, or cpu is limiting you?

 

[AkumaX]

stability!! although higher FSB will give better performance

 

[fetuchin]

agree with the whole lot: fsb with no doubt is a greater performance booster, but not always achievable. in my 1.2 case, i can never go any further 142, but seriously think about memory as i think it is the one to blame.
btw, a simple answer to your question comes from the fact that cpu-makers amd and intel have been increasing their fsbs and lowering multipliers.
finally, even more than core voltage (in my case at least) i/o voltage would make a difference as for stability (tho i think it is related with the limiting factor, being in my case memory)