My aim wasn't to run the fastest system, but to have a most silent one. I have all the outer fans on my case (Antec P190) running on slow setting beside the 200something mm side fan, which runs at full speed (and still doesn't make much noise)

I've got the following system running stable at 3789 MHz for almost 2 months now:

P7N Diamond
Intel e8400 with AC Freezer 7 pro
G.Skill 2x2GB kit (F2-8000)
Antec P190 (I shot it for less than 100 € and couldn't resist .. love the thing)
PNY 8800GTS 512MB (G92)

BIOS settings are:
FSB 1684 MHz
Dram 842 MHz
CPU +0,15 V
NB 1,425 V
SB 1,525 V
DRAM 1,95 V
DRAM Timings 5/5/5/15

everything else is on auto (I didn't try to set things I've no knowledge of)

To get started, I was slowly increasing the CPU and DRAM frequencies and tried to run memtest with it. In the range from 1600 to 1650 MHz FSB I haven't had much luck, as the system wouldn't boot, or start memtest. I had to increase the voltage alot to get any results. Ahead of like 1660 MHz things started to get more stable with lower voltage. This is why I endet with the above figures.

The system in its current shape passed 8hrs of Orthos Blend as well as small FFT's (Blend usually gave me more issues .. even though the small FFT's were rather easily passed, it crashed while testing the larger FFT's in Blend).

The only thing I'm a little scared about are the temperatures. The CPU with around 60-65° C on a daily use (up to 75° C when testing with Orthos) doesn't give me headaches, but the NB/SB runs around 55° C which I think might be a tad high.