AMD Athlon II X4 640 Overclocking
- Thread starter SintelUK
- Start date
Kamen_BG
Distinguished
- Jul 12, 2011
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Of course you can go higher !
But first check if your temps are ok.
Do not attempt overclocking your chip if it's not cooled properly.
The easiest way to do this is to reduce your North Bridge multiplier to 8x , reduce your memory clock by one step
If your ram works at 1333 mhz, which is 667 times two, then reduce it to 533 (1066 effective) and the last thing you need to do is to increase your CPU's reference clock to 247 mhz which will enable a clock speed of 3705 mhz (Ref clock * CPU Multiplier = frequency).
Note that your motherboard may not be able to handle such an overclock and your CPU might also be below avarage, so this is not sure to work.
If it doesn't work and your PC is unstable, you will have to revert it back to normal.
But first check if your temps are ok.
Do not attempt overclocking your chip if it's not cooled properly.
The easiest way to do this is to reduce your North Bridge multiplier to 8x , reduce your memory clock by one step
If your ram works at 1333 mhz, which is 667 times two, then reduce it to 533 (1066 effective) and the last thing you need to do is to increase your CPU's reference clock to 247 mhz which will enable a clock speed of 3705 mhz (Ref clock * CPU Multiplier = frequency).
Note that your motherboard may not be able to handle such an overclock and your CPU might also be below avarage, so this is not sure to work.
If it doesn't work and your PC is unstable, you will have to revert it back to normal.
Also im using the stock fan LOL My motherboard is the Asus M5A78L-M LX V2
Wisecracker
Splendid
- Jan 15, 2007
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You would actually want to keep your IMC/NB at 10x --- reduce your HT Link to 8x.
For each 10% you increase the IMC/NB speed, memory bandwidth is increased 3-4% and latency is reduced 3-5%. Running the IMC/NB at 10x250MHz (from stock 2000MHz) should provide a nice boost to your gaming, too.
1.2v NB volts should handle it easily --- you could go even a little higher if necessary.
For each 10% you increase the IMC/NB speed, memory bandwidth is increased 3-4% and latency is reduced 3-5%. Running the IMC/NB at 10x250MHz (from stock 2000MHz) should provide a nice boost to your gaming, too.
1.2v NB volts should handle it easily --- you could go even a little higher if necessary.
Wisecracker
Splendid
- Jan 15, 2007
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Wisecracker
Splendid
- Jan 15, 2007
- 8,106
- 17
- 31,965
AOD is great for 'test-driving' a few settings from within Windows, but your best bet is to concentrate on the Advanced Menu in the BIOS.
Lock your PCIe speed to 100MHz - Drop your RAMs from 6.67 to 5.33 -- Drop the HT Link Speed to 8x (or, 1600MHz) -- Raise the clock to 250MHz -- Bump the NB volts a bit.
You may then experiment with the CPU multiplier. 13x250MHz equals 3.25GHz. Test for stability and temps. You may raise the CPU mulitiplier in .5 increments up to 15 (x250MHz)
IMPORTANT! ... read your motherboard manual for information on the BIOS settings in the Advanced Menu. Understand how to reset your CMOS. Make note of your HDD settings and boot sequence in case you have to reset your CMOS!
Lock your PCIe speed to 100MHz - Drop your RAMs from 6.67 to 5.33 -- Drop the HT Link Speed to 8x (or, 1600MHz) -- Raise the clock to 250MHz -- Bump the NB volts a bit.
You may then experiment with the CPU multiplier. 13x250MHz equals 3.25GHz. Test for stability and temps. You may raise the CPU mulitiplier in .5 increments up to 15 (x250MHz)
IMPORTANT! ... read your motherboard manual for information on the BIOS settings in the Advanced Menu. Understand how to reset your CMOS. Make note of your HDD settings and boot sequence in case you have to reset your CMOS!
- Apr 4, 2013
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I was going to use overdrive to test it the go back to defualt and go into my bios to set it all up, heres what i have in over drive:
CPU NB multiplier: 8X
HT ref clock: 240
memory clock: 533
CPU VID 1.3500
should i proceed and see what i get? I should get 3.6GHz apparently.
Wisecracker
Splendid
- Jan 15, 2007
- 8,106
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You should leave the NB at 10x (2000MHz). This will set the IMC/NB at 10x240MHz.
You need to drop the HT Link Speed to 8x (or, 1600MHz).
With the clock at 240MHz, your RAMs will be running 5.33x240MHz, or 1279MHz.
You need to drop the HT Link Speed to 8x (or, 1600MHz).
With the clock at 240MHz, your RAMs will be running 5.33x240MHz, or 1279MHz.
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