Hey slim thanks for the positive feedback - I actually got a fair amount of info from your posts, it's good to see you still keep up with this thread.
I can get to 550 MHz FSB on 1402 (but also some earlier BIOS such 0402, 1301 & 1203) but I didn't test that many with my E8700 before I dropped my quad in.
My QX9650 goes to 476.25 (1905 QDR) on my 780i and I have equalled that on the 790i;
I dropped the multiplier to 6 and disabled the 2nd core which allowed me to push the FSB up to 487.5 MHz (1950 QDR).
Looks like I might need some Vcore, VTT, PLL and GTLVREF adjustments to make the 2nd core stable above 476.25 MHz.
[Edit] I was interested in comparing the 790i with the P45 for vcore requirements at high clock speed and as usual the Nvidia board requires more voltage.
Here's a ss of the E8700 @ 4.762 GHz, with the voltage set to 1.50v (LLC disabled), the P45 can do this with ~1.46v;
Some reasonable bandwidth here, with the chipset latency coming down to 45.3ns (P1 & P2 enabled).
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