overclocking an intel 8400 dual core

December 5, 2009 at 07:01:52
Specs: Windows 7
Hi does anyone out there know how to overclock a e8400 cpu on a xfx 750i sli mobo. My problem is that i'm new to all this and dont want to be changing settings that i shoud'nt be. In my bios there is only a few things i can alter. FSB clock is set at 1333, memory clock is set at 800 and the muliplier is at 9. Mem voltage is 1.9 VTT FSB voltage is 1.2 and NB voltage is 1.24. understand from reviews that the board and cpu are good overclockers. I did change the FSB to 1600 as i read this was the easiest way to get the cpu up to 3.6 ghz but pc would'nt boot up at all then had to reset the bios. should i have altered any of the other settings also like mem clock or any of the voltages??can anyone help please. System set up is;
intel e8400 dual core
mobo xfx 750i sli
ocz 4gb x 2 pc 6400 mem sticks
1 tb hd
800 watt power supply
radeon 4870 graphics card

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December 5, 2009 at 08:05:52
I have the E8400 on an Abit board-it's the P35 chipset, so it's diferent than yours. I'm running it successfully at 3.6 GHz. If you search google you'll find plenty of stuff on core voltage settings for the cpu, etc. I have the clock speed at 400(FSB 1600) with a multiplier of 9; The NB voltage is 1.26.
VTT FSB voltage is 1.1
I’m using Corsair RAM: CM2X1024-6400 at DDR2-800 & 1.8V
You should increase the FSB gradually instead of all at once.

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December 5, 2009 at 08:41:25
"FSB clock is set at 1333, memory clock is set at 800 and the muliplier is at 9. Mem voltage is 1.9 VTT FSB voltage is 1.2 and NB voltage is 1.24"

To start with, you have the RAM settings wrong. Even though you have DDR2-800, it should be configured to run as DDR2-667. That way, both the CPU & RAM will run at the same base frequency of 333MHz (1:1 ratio).

And make sure your RAM voltage is correct. OCZ makes numerous types of DDR2. Configure the voltage to OCZ's specs, do NOT rely on AUTO settings:


Ideally you should shoot for 1600MHz FSB with the RAM running in step at 800MHz DDR. From what I've read, 750i northbridge will probably need a voltage increase to be able to run at 1600MHz stably. Lower the CPU multiplier to 8x & see if you can get it to run at 3.2GHz. As always, lock the PCIe at 100MHz, disable EIST/Speedstep & all Spread Spectrum options.


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December 5, 2009 at 13:49:35
Hi thanx for the speedy reply. changed the FSB to 1600 and mem clock to 667 with a multiplier of 8. Also tweeked the NB voltage from 1.24 to 1.28 then 1.32and mem voltage to 2.1 (manafacturers spec). system would not boot up and had to reload defaults. Do i need to alter the SB voltage too??

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Related Solutions

December 5, 2009 at 14:20:58
What do you have the cpu voltage set to ? You may have to increase that a little.

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December 5, 2009 at 15:09:26
Did you check the link that I posted at the bottom of response 2?

"One thing to note is the XFX board has an overclocking jumper that needs to be set before overclocking a CPU"

If you haven't changed that jumper, that is most likely your problem.

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