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AMD Athlon II X4 640 Overclock

post #1 of 5
Thread Starter 
I've had this for a while and have never had much overclocking it.
I've had it at about 3.6GHz at the very most, I could boot, but I could not do anything else.

I have never overclocked very high before, maybe about 500mhz on a Core 2 Duo E8200 and that's it.

Here is what I have right now (I'll put a * if I don't know what to do with it):

Multiplier: x15
HT Reference Clock: 200MHz (15x 200 = 3,000MHz)
PCIe Clock: 100MHz *
CPU Voltage: 1.4v
North Bridge Voltage: 1.175v *
DRAM Voltage: 1.55v
HT Voltage: 1.2v *
NB Voltage: 1.1v *


When I overclock, I normally just put 15x multi, 220mhz freq., RAM at 1866mhz (others have gotten 2200mhz quite easily on this RAM), but I have no idea what to do with anything related to NB / SB / HT / HT Link or anything with those words in them.

If I overclock and get 3.6ghz with 1866mhz RAM I just instantly get blue screen, before it boots. Sometimes I even have to reset CMOS just to get anything to happen.

Also, does anyone know what timings etc. I should have on this RAM?

I have no idea what settings I need for this RAM.

I use BIOS for overclocking, not overdrive or anything.
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post #2 of 5
As a first step, Take your Hyper X Blue's up to there rated voltage -1.65v, you are starving them at 1.55v.

You will have to keep the Ram at or below 1600 most likely and do that by changing the ram bus ratio. You might get the ram to go higher but it will need moar Voltage!

Your processor will likely not be stable at stock voltage, and at 3.6ghz my experience has been 1.48-1.53v on the cpu to be stable. Make sure you keep your ht/nb down to around 2000 while ocing and then take it up just a bump once you are stable at your max cpu frequency.

You might need a bit more cpu/nb voltage(not NB voltage) when you start clocking the ram.

Just to get the cpu stable I would set all the ram settings to Auto, (not voltage). Mess with that once you are happy with your oc.

Once you are 8 - 12 hrs p95 stable, then move on to the ram.

*One more thing- The IMC on the 640 is rated at 1066-1333mhz for the ram. Regardless of what the motherboard supports, the IMC(internal memory controller) on the processor is what will dictate how high you can clock your ram. You should be able to get 1600mhz no problem, regardless of the IMC rating, but going over that is unlikely considering the amount of voltage needed to keep stable. The IMC voltage in controlled by the CPU/NB voltage. The NB voltage is the physical NB on the motherboard.
Edited by cook - 6/3/11 at 10:16am
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BullDriver
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post #3 of 5
Quote:
Originally Posted by cook View Post
As a first step, Take your Hyper X Blue's up to there rated voltage -1.65v, you are starving them at 1.55v.

You will have to keep the Ram at or below 1600 most likely and do that by changing the ram bus ratio. You might get the ram to go higher but it will need moar Voltage!

Your processor will likely not be stable at stock voltage, and at 3.6ghz my experience has been 1.48-1.53v on the cpu to be stable. Make sure you keep your ht/nb down to around 2000 while ocing and then take it up just a bump once you are stable at your max cpu frequency.

You might need a bit more cpu/nb voltage(not NB voltage) when you start clocking the ram.

Just to get the cpu stable I would set all the ram settings to Auto, (not voltage). Mess with that once you are happy with your oc.

Once you are 8 - 12 hrs p95 stable, then move on to the ram.
also he needs a new cpu cooler stock is insufficient to oc with the stock athlon cooler sucks the cool-master hyper tx3 is a good low price tower cooler
post #4 of 5
Agreed, that is what I was using for a while and my temps where 21-4c/47-50c idle load.

The corsair A50 is a better alternative and can be found for like 15.00 new on the ebay.
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BullDriver
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64Gb Crucial SSD(os) +1tb Baracuda SataIII Asus OEM SATA DVD RW x64 Windows 7 Home Premium 25" Hanns G 
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post #5 of 5
Thread Starter 
This is a temporary CPU, I'm going to get Bulldozer when it comes out so I'll pick up a Hyper 212+ when that arrives. If the Bulldozer CPUs are too high in price then I'll just pick up a Phenom II X4 955 for $118. I know I can overclock a LOT higher on one of those.
Edited by WaterMelnKidd - 6/3/11 at 5:08pm
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Gaming System 3.0
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