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Q9550 on ASUS P5G41T M-LX. Stuck at 3.352 Ghz

Last response: in Overclocking
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December 1, 2011 12:25:48 PM

Well first of all i must say that i'm not an expert on overclocking, but i used to overclock my Q9550 up to 4 Ghz on my previous mobo gigabyte EP45-UD3 (rev 1.0) just fine. But i was using it on 3.6Ghz because of my limited cooling. It had DDR2 800Mhz rams on it which were underclocked.

However, i changed it to ASUS P5G41T M-LX recently which i can see now has terrible overclocking ability. The change was made because i tought my PC was struggling a RAM bottleneck, thus i put 2x4 GB DDR3 1333Mhz Rams on it. Afterwards i found out that my pc was struggling a CPU bottleneck, and there was no such thing as a RAM bottleneck. :) 

Now my problem is:

This new Motherboard only allows me to overclock to 3.352 Ghz (8.5 x 394) with every voltage option left on auto. when i set it to 395, no pass.

Voltage options are very limited and goes like

Vcore (which has 3 options in it such as +50mv +100mv +150mv)
VTT and NB.
DRAM voltage, PCI frequency are also other options on this page of BIOS.

I'm trying to set CPU frquency to 400 with simply bumping Vcore +50mV, and others on auto, it still gives me the black screen and won't start PC at all. +100mV and +150mV options also cause this.

Is there anyone know how to deal with this MOBO? Am i missing an option needs to be disabled/enabled I really need to overclock it to at least 3.6 Ghz. I can see that now G41 chipset isnt designed for oC'ing at all !!


ASUS G41T-M-LX Motherboard (with latest chipset driver, BIOS etc.)
Intel Q9550 Core 2 Quad 2.83 Ghz CPU with a Zalman cooler unit on it..
2x4 GB DDR3 1333Mhz GSKILLS RIPJAWS RAMS (underclocked)
ASUS EAH5870 Radeon 1 GB DDR5 Graphics Card. (11.11 Catalyst Drivers)
Coolermaster 700W Power Supply.
Creative Audigy Soundcard.
Case is a Thermaltake tower. Enough air flow. Enough Fans.
Win 7 64 Bit OS (Latest updates).


December 1, 2011 4:34:50 PM

audicted said:
Is there anyone know how to deal with this MOBO? Am i missing an option needs to be disabled/enabled I really need to overclock it to at least 3.6 Ghz. I can see that now G41 chipset isnt designed for oC'ing at all !!


Not what you want to hear, but according to my research, the G41 doesn't like to run above the stock 333mhz.
The fact that you hit 394 is rather impressive, IMO.
When I threw together an E8400 system for my son, I wasn't paying any attention to the chipset, and also used a P5G41 (50 bucks on NE at the time). It wasn't Linpack stable after 380, wouldn't even post at 395.

I hope someone has a better answer for you, but I think you've taken that board as far as it can go.
a c 172 à CPUs
a c 197 K Overclocking
a b Ĉ ASUS
December 2, 2011 11:20:15 AM

Yep. Both of you have "golden" G41's. My best one (I have three in office systems) can reach 362 MHz.

You both have gone farther than most with G41's.
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December 14, 2011 8:18:22 PM

I have the same motherboard as OP with a Core 2 Quad Q9400. Did you lock your PCI Express Frequency at 100/101? I have a FSB @ 347 and I don't know what else to do...
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