Originally Posted by icablood
After 3.6, youll need to play with the voltage to achieve stability, 1.3600v - 1.400v area for 4.0ghz range. and like Darkknight512 said, you wont reach the max as it will get to hot. With getting higher ghz, youll also need to up the speed on the ram as well.
Forgot to add, fsb x2 = ram speed for this, please correct me if im wrong on this.
Negative. You shouldn't need that much Core voltage for 3.6 - 4.0. Also, the clock frequency x 2 = ideal RAM Speed and clock frequency x 4 = FSB. So, at a 400MHz clock freq. you would want to run your RAM at or near 800MHz and your FSB would be humming along at 1600MHz. As your freq. clock gets higher, you will need to change the memory strap (ratio) to keep the RAM speeds in a range that they can handle.
Check my sig for some hints about voltages. At 3.6GHz, I need ~1.25v at Core, 1.2 FSBv, no PLL adjustments, 1.2 NB and 1.5 SB. At 4.0GHz (500x8), I needed 1.35v Core and 1.28 FSB. Keep in mind, I have 8GB of RAM, so I need a touch more FSB and NB volts.
Originally Posted by systemlayers
I really don't think you're going to have problems with the E8400 bottlenecking the 260 though....
You might squeeze maximum 5 more fps out with a higher clock on the E8400 but I think your friend might want to look at getting a new gpu if he wants more performance.