What gains do I get by raising the bus speed?

[bart1975]

I am just wondering what kind of performance increases I will get from raising the bus speed and lowering the multiplier to keep the cpu running at the same speed Ghz wise.

 

[Ben90]

Depends on your platform. Socket 775 processors could gain a little bit from the increased FSB speeds.

Today's 1366/1156/1155 processors don't explicitly gain anything other than an unstable QPI/QPI/Southbridge IF you are aware of using non-cpu-multipliers. Raising the bus speed on 1366/1156 will increase your RAM/Uncore speeds. If you then simply lower those multipliers to take it back to stock speeds, the only thing that has sped up is your QPI.

The QPI on desktop processors already has plenty of bandwidth. Unless you plan on sticking $3000+ worth of cards into your PCI-e slots, you won't be running out of bandwidth. AKA no gain.

1155 is a little bit different story, and without typing up a lot of stuff, don't touch it. Just use multipliers.

 

[bart1975]

My cpu is a AMD x3 450

 

[Ben90]

Hmm, I haven't been on AMD processors since a very long time ago. Am I correct in saying that the memory multipliers are separated from the HT speed?

If the above is true, then the only thing changed will be your Hyper Transport speed. Again, unless you are REALLY stressing the bus (you aren't), it will probably be best to use the highest CPU multiplier possible and then start upping the HT bus last.

 

[jvroig]

My cpu is a AMD x3 450

Your memory speed will increase, as well as your CPU-NB (IMC) speed because it is on a separate multiplier.

As for relevance, I doubt you would get any noticeable increase in performance.