Solved Overclocking E8400 on Asus P5G41C-M LX help!!!

February 11, 2012 at 10:21:24
Specs: Windows 7 Ultimate x64, E8400 /4 GB

I am running on Auto Overclock via Bios setting @3.4 GHz for a few years already, quite happily, and need help to push it even further with manual settings. My proudly self-essembled rig :

Asus P5G41C-M LX (Intel G41)
E8400 @3.4 GHz with Arctic Cooler 7 Rev.2 air fan
PNY GTX 460 @820 MHz OC
4GB DDR3 - 1066 (7-7-7-20CR1) (2GB Kingston and 2GB G Skill)
LG 42" LCD via HDMI

I am using my PC mostly for gaming - Skyrim, W40K Spacemarines, Crysis 2, Civ5, ect... which all increasingly require high-performance CPU - most reccomend Quad Core CPUs. So I decided to pump up the aging E8400 to @4 GHZ ( or as high as possisble as long as I do not have to upgrade to water cooling - max 75-80* C) as far as I know) before buying the new generation i5 in 8-12 month (once the prices are down).

The problem is that after reading various E8400 overclocking tutorials, I cannot relate most terms (e.g. V Core) to my BIOS settings, and I cannot find overclocking instructions for my specific board with E8400 capabilitties (open multiplier, etc..).

My BIOS manual overcloking options are in full below:

CPU Frequence (200-800 range)
DRAM Frequence ("Auto" or varios multiple choice options which auto-change after the CPU Frequency value is changed)
PCI Express Frequency ("Auto" or 90 - 150 range)
Memory Voltage ("Auto" or 1.2000V - 2.4450V)
NB Voltage ("Auto" or 1.12500V - 1.51875V)
VTT Voltage (""Auto or 1.20000V - 1.29375V)
SB 1.5V Voltage (1.5V or 1.6V)
Auto PSI (Enabled/Disabled)

Any suggestions are greatly appreciated....

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February 11, 2012 at 11:05:35
The E8400 runs at 3.0GHz (9 x 333MHz), so 400MHz really isn't a major overclock. Most people just jump the CPU frequency up to 400MHz & run the CPU at 3.6GHz. The RAM should run in sync at either 1:1 or 1:2 ratio. Unfortunately, DDR3-1066 is the wrong RAM to pair up with a 1333MHz FSB CPU so it's going to limit what you can do.

The 1st thing you need to do is disable AI Overclocking - set it to Manual. The CPU frequency can then be adjusted by using the + or - keys, or you can enter the number you want via the keypad. Try 400MHz.

The PCIe freq should be set to 100MHz.

Try the RAM at 667MHz. If that's not an option, try 800MHz.

The CPU multiplier is called Ratio CMOS Setting.

The CPU voltage (vcore) doesn't appear to be an option. Don't mess with the other voltage settings.

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February 12, 2012 at 03:15:45
Thank you very much for your help.

A few corrections from my previois post - I installed AIDA64 and it says that both of my 2GB sticks RAM are DDR3 1333 so is this good news?

Also, you suggest to OC to 3.6 GHZ, but I am aiming at at least stable 4 GHz otherwise I could just stay at stable AI OC.

GIven the setings options in the BIOS manual OC menu - can you please suggest which options and vanlues to try changing. Sorry for a dumb question - I am a noob wih OC ;]]

Many thatnx again...

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February 12, 2012 at 05:03:36
✔ Best Answer
Reaching OC 4.0 with an E8400 would be in the realm of Extreme Overclocking and even an advanced watercooling system might not be enough to keep the temperatures reasonable with the voltages you would need (vcore and chipset overvolting) and definitely not on a G41 MB since it only supports FSB1333 (freq.333) not even FSB1600 (freq.400) , especially with a multiplier locked down to a maximum of 9 (333x9=2997 or 2.997 or 3.0). To even attempt anything that extreme you would need a motherboard with a P45 chipset and it would not be suitable for daily usage. You would need a 2nd generation sandy bridge K series and appropriate board to run those speeds for daily usage (with an aftermarket air cooler).
Please note that 3.4GHz is already a good OC for an E8400, especially considering you are using automatic settings.

You have to be a little bit crazy to keep you from going insane.

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February 12, 2012 at 07:42:21
"I am aiming at at least stable 4 GHz"

It's not gonna happen with that motherboard.

"otherwise I could just stay at stable AI OC"

Suit yourself. AI OC is not optimal. It appears all you're doing is looking at the numbers & you're not concerned with best performance.

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