Overclocking the FSB alone

Alright, I'm relatively new when it comes to overclocking, but I've learned and picked up a lot in a short amount of time.  I'm having issues with one aspect of it, however.  First, let me tell you my pertinent system specs:

Intel QX9650

Gigabyte P45 motherboard

8GB DDR2 memory on 4 sticks

GTX260 (192)

The stock configuration for this system is a 333 MHz FSB with a 9x multiplier for 3.0 GHz.  I've pushed it to 333 x 10.5 for 3.50 GHz on the stock box cooler and stock voltage (can't bump voltage due to temp concerns).  Memory runs at 533 MHz on an 8:5 divider.

Now, the question.  Since the processor has an unlocked multiplier, I can fairly easily set the processor to run at just about any speed I desire.  Is there any real difference between using a 400 mHZ FSB and a 333 MHz in terms of system speed?  Is there any benefit to overclocking the FSB if the processor and memory wind up at the same speeds?  Here's an example:

Setup A: 333 x 12 = 4.0 GHz CPU clock, memory on 8:5 divider for 533 MHz

Setup B: 400 x 10 = 4.0 GHz CPU clock, memory on 4:3 divider for 533 MHz

Is one setup any faster than the other?  Are there any advantages to a higher FSB clock in the case of Extreme Edition processors?  Every guide out there deals with overclocking "regular" processors with locked multipliers, so this is one question I haven't been able to find an answer for.

If I do remember correctly, increasing the fsb is more of a performance gaining OC, rather than just bumping up the multi.

Does anyone else feel like recommending Boa's guid to OCing right now? (I had the urge to say it.)

[edit] Now that I think of it you could look up how to OC an AMD based cpu they all have unlocked multi's.  It you want an easy breakdown look for an AMD 2500+ OC guide.  There is one on here that was created by Boa, who is the person i referenced before.  He has a great guide.  It's from around 2005 so it will be a bit dated, but that will give you the right idea.

Also you have to physically change the cpu's fsb and multi to give yourself a good idea of the gains by using benchmarks and so on.  you should start with the stock times and work your way up from there.  Happy OCing!

Setting your multi will allow you to then get your ram and FSB running 1:1 much easier. What speed is your memory? If you can set the FSB and Multi to match the ram then you will be set.

For example my DDR2-800 runs at 400 MHz I have under clocked my ram to at 366; so that it runs 1:1 with my FSB. My Milti is stuck at 9 (on my E6600) so take 9 x the FSB (366) I get 3.294 Ghz. Ideally you would like to have your ram and FSB run at 1:1.

http://www.nordichardware.com/Guides/?page=1&skrivelse=517 Benchmarking a Core2Quad at the same clockspeed, but different multiplier and FSB settings. Short answer yes you do get a speedbump in some things.

Also I miss Boa. I bought a 512mb stick of Kingston HyperX memory from him. I thought I had sooo much memory. My mobo was single channel.