I'm running 450x8 (3.6) on mine and get lower temps. I set my VCore to 1.325 in BIOS and it gets read under load by CPU-z as 1.28
Tempwise, using RealTemp (shows TjMax of 95C), I idle at 39-42C across cores... most simple stuff (Internet, etc) bumps that to mid 40s or so. Games get it up to the upper 40s to mid 50s. Mind you, most games I play don't use all 4 cores. A full on run of Prime95 puts it in the mid 50s on the non-heat maximizing tests, and up to 62 on the heat maximizing tests.
[I keep my place at a steady 70-75 Fahrenheit, year round.]
I use a Zalman 9700 Cooler, with Artic Silver Ceramique, in an Antec P182 case with optional front fan installed.
My BIOS settings are below as copied from my own thread on this setup.
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Okay, here's my latest setup.... I'm getting 3.60 GHz at decent temps. I think I may be done with tweaking it for now. [Note: I put the memory back to 1:1 speedwise]
Q9450 @ 3.60 GHz -- Prime95 -- 7.25 hr run
CPU Speed 3.600
[Note: other settings are made in other areas of the BIOS. I turn OFF the following: C1E, EIST, Virtualization, Exec Disable Bit. Set HPET to 64-bit mode. BIOS is set up for AHCI on SATA drives, not IDE emulation, etc.]
Robust GrBstr Auto
CPU Clock Ratio 8
Fine CPU CR 0.0
CPU Host Freq 450
PCI Express Freq 100
C.I.A.2 Disabled
Performance Enh. Standard
Sys Mem Mult 2.00B
MemSpeed 900
Timings 5-5-5-15 (rest set to auto)
CPU/PCIEX CD Ctrl 800mV <-- this is the default
CPU Clock Skew Ctrl Normal
(G)MCH Clock Skew Ctrl Normal
System Voltage Control Manual
DDR2 OverVoltage Ctrl +0.30 <-- takes memory to 2.1 V
PCI-E OverVoltage Ctrl Normal
FSB OverVoltage Ctrl +0.20 <-- don't exceed this!
(G)MCH OverVoltage Ctrl +0.250
Loadline Calibration Auto
Vcore 1.32500
Normal CPU Vcore 1.23750V <-- as read by BIOS
Vcore (@load, by CPU-z) 1.280
Min Idle Temp 39-42
Max Load Temp 56-59//60-62 (the higher set is under max heat generation tests; the lower set is from 100% load, but not geared towards max heat generation)
SuperPi - 1M 13.025