Here's some reference information for running at stock speeds
during preliminary system testing / burn-in to establish a reference point
before I overclock it:

Q6600 G0/SLACR L723A841
Stock speeds / powers / voltages reported by P5K DELUXE WIFI motherboard
running Fedora 7 LINUX.
2.6.22.1-41.fc7 #1 SMP Fri Jul 27 18:21:43 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

1.15 Vcore 266x9: acpi-cpufreq: *P0: 2394 MHz, 88000 mW, 10 uS
1.06 Vcore 266x6: acpi-cpufreq: P1: 1596 MHz, 59048 mW, 10 uS

Currently running burn in testing with MLucas version of Prime number
factoring code on all 4 cores (Prime95 for LINUX basically)
@ 1.15 Vcore 2394 MHz 266x9, 88 CPU Watts,
Core 1 49C
Core 2 48C
Core 3 43C
Core 4 46C
reported by lm-sensors code / sensors utility; hopefully it's accurate.

Cooled by air with a *loosely* (twists easily -- needs fixing) mounted
600 grit flat lapped ThermalRight Ultra 120 Extreme using
2x SFF21F fans @ 1600RPM in a push-pull configuration.

Arctic Silver 5 applied according to their own Kentsfield Quad Core
application instructions (e.g. squirt out a line/bead of paste from
side to side of the IHS and then just install the heatsink, don't spread it
manually).

ANTEC Sonata 1.0 Case, 120mm rear case exhaust fan,
Antec Quattro 850W PSU.
Motherboard System Temperature reads: 39C.

4 DIMMS Super Talent 2GBy Micron D9HNL DDR2-667MHz memory (8GBy total).

XFX 7800GT card, Diamond XS71DDL sound card.
0501 BETA P5K DELUXE WIFI Motherboard BIOS.