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AMD ii 640 x4 640

post #1 of 26
Thread Starter 
Hi

I have the above cpu on a Asus M4A87EN/USB 3. I am pretty knew to overclocking so am a blank slate (sure you hear this all the time). At the moment I have just used the o/c tuner in the bios but I would like to do it myself as this gives me more scope. I have read many forums/guides but none of them have the same terms as in my bios? And when I tried the system wouldnt post so I am hesitent to try again.

Can someone give me some starter points please?

Thanks

Will
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post #2 of 26
This should help.

welcome to OCN! to help us understand what you're working with more, at the top of this page, go to user cp, then on the left side, "add system" and put in your system specs.
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post #3 of 26
Thread Starter 
Specs updated!

Thanks for help
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post #4 of 26
nice system. set your ram timings, speed, and voltage manually, to the specs of your ram. for better stability at the highest overclocks, turning off cool and quiet and c1e will help, but will cause your machine to use more power.
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post #5 of 26
Thread Starter 
ok, I think I have done that but....I changed to 7-8-7-24, and 1.65V but not sure where to set the speed. I think that option is disabled because of the settings in the bios. Also there are a lot of options after the timings that I have no idea what they do!?

Also, it says in the motherboard manual to use the blue slots for overclocking the RAM but I can't due to my heatsink (artic freezer pro). Can I still change the above settings and is it going to be an issue?

Thanks


I will turn those things off.
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post #6 of 26
changing those settings won't overclock the ram- just manually set them to stock settings.

did that guide help? since your multi is locked, you'll have to overclock with the fsb- just go up incrementally til you get unstable. then add a couple notches of voltage and repeat til your temps get up to 45 or so under load.

changing your fsb also changes nb, ht, and ram speed, so you may need to set your ram divider accordingly also try to keep ht in the 2000-2100 range. nb will be fine but you may need to add a little voltage to your cpu-nb.

cpu vcore, cpu-nb, and ram are the only voltages you should have to change.
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post #7 of 26
Thread Starter 
Is it just those settings that I need to change? What about the other settings for the RAM?

I didnt realise my multiplier was locked. So upping the FSB is the first step? Is it unstable when it doesnt post or during a test on Prime?

Yea, guide is helpful but confusing at points. Its all new!
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post #8 of 26
Quote:
Originally Posted by skaboy607 View Post
Is it just those settings that I need to change? What about the other settings for the RAM?

I didnt realise my multiplier was locked. So upping the FSB is the first step? Is it unstable when it doesnt post or during a test on Prime?

Yea, guide is helpful but confusing at points. Its all new!
If it does not post it is unstable clearly, but what we are looking for when we say stable is ~8hrs of prime. That ensures that your overclock wont randomly crash on a sudden increase in processor utilization.

Your Multiplier is locked, so raising the FSB is the way the overclock has to be done. To simplify the tutorial -

First step - Find Highest stable FSB
Set your Ram Ratio, NB multiplier, HT Multiplier to lowest , and cpu multitplier to lowest and take the FSB up from 200 about 6Mhz at a time- after each sucessfull boot, run 4-8 tests of prime, 5 - 10 minets worth, until you reach that place where its not passing the test. Once you reach that point change your CPU Vcore to about 1.44~1.53 and see if you can boot stable at the settings that where just unstable. If you can, go up to the next 6Mhz and again until you find your maximum stability below 1.55v. You will probably settle for a lower clock speed than your Max because who wants to run 1.5Vcore all the time? My guess is your Maximum will be between 250-255mhz on the Fsb.

Second step-Find Highest CPU Clock
bring the cpu multiplier up to 15X and repeat the steps of increasing voltage and prime testing. Once you reach the point where prime wont run for the few tests shoot a cpu validation and post it up as your max, then back off of that 10-16MHZ and attempt a longer stability test.

Third Step - Mix it all together
Bring your HT/NB and Ram Freq up. NB and HT should be around 2000Mhz and the Ram should be closer to 1333 than 1600 until stability can be confirmed. You may need to add voltage to the NB, just read closely as it will look like there are multiple places to do that in the voltage settings, just use the one that sayz NB voltage without much else.

Forth Step - Ram
You have already added voltage to the ram, that is good. During the OC process I would relax the timings to 9-9-9-24 with a 2t command rate. Don't worry about the long list of other settings for now, most of them can be left on auto and when you change the first 4 settings they will adjust accordingly.
Once you are finding stability with the CPU at the desired speed, and the HT and NB Frequency are high enough, then start raising the ram Freq. I would not suggest going over 1600Mhz, but as close to it as possible, then start bringing your timings down 1 point at a time, Stress testing after each setting for a few minuets.

Step Five - The big cooker
To ensure stability its best to do the Marathon test of 8 hours. If your not passing this test, raise voltages or drop Mhz.

My Guess is you will hit 3.6Ghz stable @ 1.53Vcore with your ram at 1600 Mhz. You will probably decide that that is too much voltage and drop back to 3.51 and @ 1.48Vcore and be happyish. I bet your maximum bootable is around ~3.75-3.82Ghz with the extra voltage of corse.

Here is a thread I did when I was overclocking the same set up.

My attempt to OC the 640
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post #9 of 26
Thread Starter 
I have found my fsb max, it seems to be 246, as it keeps giving me BSOD. When you say change voltage, the only option I can see is to change the offset cpu voltage setting? Is this the same thing and you add them together?

Related or not I dont know but my speakers are connected to a av received through my soundcard and then to 5.1 speakers. Since messing around with these settings, the speakers have started playing crackly. Radio plays fine through them.

Thanks
Edited by skaboy607 - 1/19/11 at 3:49pm
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post #10 of 26
Is your motherboard the M4A87TD? I cannot find the EN variant anywhere. The TD/usb 3 board is a nice board.

If you look on this screen, it will be the CPU Over Voltage Setting. Odd name because you could use this setting to under volt the cpu as well.



The setting will 100% turn yellow then red. Throw caution to the wind as that is the motherboards recommended voltages. You can take that setting up to 1.55 if your temperatures are nice and cool. I have heard of people going higher but I would not do it to my system.

If this is not indeed your mother board, take a few photos of the voltage pages of your bios and post them up. We will get you "up to speed"
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