Advice on overclocking my i7 875k on an Intel DP55SB

[Anarki]

Just after some help really, I'm looking to get the best out of my setup and am struggling with the BIOS on my Intel DP55SB. I don't understand how each of the features affect other aspects of other features.

I'm not a total noob to the overclocking scene but this board is really awkward in my hunt for a decent 24/7 overclock.

I'll grab some screenshots of the BIOS a little later as I'm currently using said machine, but in the meantime does anyone have any tips on overclocking an 875k in general? I had it running @ 24x160 on 4,3,2, cores and 25x160 on 1 core @ 1.3V. I had weird issues running a 10x multi so now its currently its running at 18x200 on all cores with a 8x multi and all is fine @ 1.3V. The QPI link is now at a much better 3.6GHz which I'm happy with. I'm hoping to get 4GHz on all cores and maybe a higher speed when running on 1 or 2 cores.

My setup:

Intel DP55SB
i7 875k
Antec Kuhler 620 with 2x yate loon D12SH-12 fans (push/pull)
16GB (4x4GB) of Kingston DDR3 LoVo 1600MHz @ 1.35V
Sapphire 7950 @ 1GHz/1.25GHz (core/mem)
120GB OCZ vertex II SSD
1TB Samsung HDD
620W OCZ 80+ bronze PSU
All housed in a Silverstone PS07 with two Enermax 120mm TB silence fans on the front intake.

[Charles Wirth]

The 875K... well at least it is unlocked and allows higher memory ratios and reducing latency should yield some performance increase.