yes but each motherboard of same model/brand can perform differently due to quality of MCH/NB, memory used as well well as the quality of the power supply you use (example
http://i4memory.com/showthread.php?p=44980#post44980).
i.e. have a crappy board with max 370fsb limit, and E6600 ES cpu isn't gonna do crap to improve a 370fsb limit or clock better than a retail E6600 on a board with 420fsb limit.
So what you need separate threads for each cpu, motherboard, memory and psu combination as well ?
zoob above in this thread uses a different psu from you so, he should post in another thread too as it's not what you're using ?