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My Core 2 E6400 ridiculous overclocking

post #1 of 31
Thread Starter 
Hello guys.

I'd like your help to know why I can't overclock my Core 2 Duo E6400 more than 2.39 GHz (299 FSB x 8)
I'm pretty frustrated because I've seen reviews around the net saying people can OC they E6400s at more than 3 GHz easily.

My current setup:
CPU: E6400 with original air cooler
Mobo: Foxconn 975X7AB w/ latest BIOS
Power supply: Thermaltake 470W
DRR2: Twinmos PC6400 (800 MHz) 5-5-5-18 (I know this sucks)
Sapphire X1300 512MB
2x Western Digital Raptor 150 GB in RAID0

My temps are really great (CPU at 25 C. and system at 33 C.) but the maximum stable speed I can get is 2.39 GHz
(and I'm downclocking the memory speed at 4:5 - 749 MHz ).


I tried increasing the CPU Vcore voltage, the DRAM voltage, the MCH voltage... nothing seems to work!
I don't want to reach speeds over 3 GHz, but at least 2.6/2.8 GHz!

Please help!!!!

Thanks a lot!!!!!


Dolphin975
post #2 of 31
have you locked your PCI bus?
    
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post #3 of 31
Hi and welcome to the forum.

First, I'd like to see some screenshots from CPU-Z. Give us the main screen and the memory tab. This will help us a bit figuring out if there are any obvious issues.

It might just be that the motherboard you have ain't that good for overclocking. However, you're not getting any good overclock at all (a mere 12% or so)... so probably something else is causing havoc.

Alk: good point Set PCI-E to 100MHz, and PCI (if separately controlled) to 33MHz
    
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post #4 of 31
Are you using the stock heat sink? This may be something you want to upgrade. To increase your overclock, increase the voltage of the processor, memory, and NB. Don't go crazy with it, just a few increments at a time. That should help!

Edit* - A mod needs to move this to Intel CPUs.
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post #5 of 31
Thread Starter 
Hello,

I've uploaded my CPU-Z main and memory tabs.

Talking about the PCI clock, all my mobo says is:

Auto Detect PCI Clk and is set to Enabled.

Is there a utility that lets see the PCI bus speed?

By the way, there are several reviews of the the Foxconn 975X7AB in which they says it's good for OC!
But my E6400 just overclocks a mere 12%!!!

post #6 of 31
You have enough voltage on the CPU (actually a little to much). The memory isn't in 1:1, which your memory can do. Get your memory to a 1:1 ratio with the FSB. Have you increased the North Bridge Voltage?
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post #7 of 31
Thread Starter 
>You have enough voltage on the CPU (actually a little to much).

Ok, I'll lower it.

>The memory isn't in 1:1, which your memory can do. Get your memory to a 1:1 >ratio with the FSB.

Actually, when I have a 1:1 ratio the system isn't stable at 299 FSB, I had to stay at 280.
I figured it out it was the memory, that's why I now use a 4:5 ratio.

>Have you increased the North Bridge Voltage?

It's the MCH voltage, right?
If so, I increased it a bit (+0.1) but I'm not sure how much I can go.

Is it correct to have the Auto Detect PCI Clk to Enalbled with the PCIe to 100?


Thank you!
post #8 of 31
Quote:
Originally Posted by Dolphin975 View Post
>You have enough voltage on the CPU (actually a little to much).

Ok, I'll lower it.

>The memory isn't in 1:1, which your memory can do. Get your memory to a 1:1 >ratio with the FSB.

Actually, when I have a 1:1 ratio the system isn't stable at 299 FSB, I had to stay at 280.
I figured it out it was the memory, that's why I now use a 4:5 ratio.

>Have you increased the North Bridge Voltage?

It's the MCH voltage, right?
If so, I increased it a bit (+0.1) but I'm not sure how much I can go.

Is it correct to have the Auto Detect PCI Clk to Enalbled with the PCIe to 100?


Thank you!
The memory is rated to 400Mhz, so if it is having trouble at 299Mhz, send that stuff back....

I think the MCH is the south bridge. That also could use a voltage increase if you use SATA though.
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post #9 of 31
Thread Starter 
>The memory is rated to 400Mhz, so if it is having trouble at 299Mhz, send that >stuff back....

4 : 5 my memory:FSB ratio.
So you must consider: 299 : 4 x 5 = 373.75 x 2 = 747 MHz the actual speed at which the mem is running.
post #10 of 31
Quote:
Originally Posted by Dolphin975 View Post
Is it correct to have the Auto Detect PCI Clk to Enalbled with the PCIe to 100?
This feature auto detects if you have any PCI slots filled and if there needs to be a recognition of the device in the slots.

Disable this if you have no PCI cards in your system. Enable it if you do have PCI cards.

Rather than trust those types of reviews you would be far better advised to come to these forums to find out what people who have put systems together find the best for the money. I would NOT advise that board to anyone personally.

R
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