Clock speed vs front side bus speed

lincsman

lincsman

Member
Hi there. I am running an AMD fx-6300 processor and when set to "performance" in BIOS it runs at 3.8GHZ. I tried manually overclocking and it was different than it was years ago and it didn't work (computer told me on boot screen and sent me into BIOS). However I did manage to set the bus speed to 215mhz with everything else on auto, but CPU-Z tells me that the max clock speed with that setting is 3.77GHZ. So it is safe to figure that the more I up the FSB speed, the lower the clock speed will be. So, my question is, what is the best setting to get the best frame rates in games? If a higher FSB speed is better how high should I set it? I would rather ask first as apposed to further trial and error. Thanks.
 
Don't touch your FSB speed as it messes with the speed of your RAM and PCI-Express slots. It works for overclocking I suppose, but the multiplier is easier and safer to mess with. You should have the FSB bus at 200MHz and just change the multiplier. You should also disable any and all automatic overclocking ,they're trash anyway, and set it manually. With a clock speed of 200MHz, a multiplier of 18 would get you to 3.6GHz. Start from there and work your way up, testing and for stability and temperatures as you go. If you're on the stock cooler you won't be able to make it much past 3.8GHz or so I'd guess.


This reminds me I need to get the overclocking guide written.
 
Clock speed = Multiplier * Bus

Since modern CPUs utilize an unlocked multiplier, just use that for OC. The traditional 'FSB' (which has evolved over the years) also has ties into other frequencies like PCIE and RAM mentioned above, which would be raised (via divider against the FSB) among others and you may introduce instability into other subsystems.
 
you know what, I used the AI tuning program and got it to 4.1ghz. It ran stable but temps while gaming were 55-56 degrees, and the max is 65, ideally 60 as a max. I didn't want to risk it and yes I have a stock cooler so I have it at 3.8 running at 50 degrees gaming. That way I have some leeway if it gets warmer from a warmer room temp or something like that. Don't want to fry it for getting a 2-3 fps difference. In the BIOS I don't seem to have an option for adjusting the multiplier which kind of sucks.
 
lincsman said:
In the BIOS I don't seem to have an option for adjusting the multiplier which kind of sucks.
Click to expand...

You're doing something wrong then.

First and foremost, disable the automatic overclock as having it on probably prevents you from changing your multiplier. It might also be called CPU ratio or similar and you might have to enable manual ratio or multiplier control before it shows you the ability to change it. Look around, it's gotta be there. Leave your FSB speed alone, seriously. Find out how to change the ratio and work from there.
 
I believe on that ASUS board you have something like "ASUS Overclock Tuner" which can be 'Auto', 'Manual' or a third option. And it's called 'CPU Ratio' and should be right under OC tuner option.
 
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