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how do i overclock my amd x4 640 propus 3ghz

post #1 of 10
Thread Starter 
im asking for very simple step by step instructions and what buttons to press.
post #2 of 10
THere are some very good tutorials on this forum, the AMD CPUs section, don't know how you've missed them.
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post #3 of 10
Thread Starter 
dont kno where to look
post #4 of 10
Hah, I can't find the guide either!!

Don't know what's happening, I should do smth about it...

For now - I'll post a detailed info for you in a minute. Stand by
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post #5 of 10
Give this thread a good looking over (ignore the tittle of Phenom II) it will give you lots of good info plus a real good path to follow even for the Athlon. http://www.overclock.net/amd-general...ing-guide.html
 
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post #6 of 10
***!!!make sure you have an aftermarket cooler!!!***

***use CPUz to monitor all frequencies***
***use HWMonitor to monitor all temps***

What do you have in BIOS:
BIOS settings are as follows (not *YOUR* specific BIOS, but in general):
Reference clock (also called CPU clock, CPU freq, FSB and so on, but Reference Clock is the only correct way to name it).
CPU multiplier.
North Bridge multiplier.
RAM multiplier

How to OC:
OCing is acheived either by raising multipliers or by raising reference clock.
The reference clock (sometimes *inaccurately* reffered to as FSB) has a value of 200 in BIOS before the OC.
From that ref.clock, all frequencies in the PC are calculated;
Example:
ref.clock: 200
CPU multiplier: 16
Final CPU frequency by core: 16*200 = 3200Mhz (3.2Ghz)
North Bridge(NB) multiplier: 10
Final NF freq.: 10:200 = 2000Mhz (2Ghz)
RAM multiplier: 667
Final RAM freq: (666/100)*200 = 1333Mhz

Now, most of those multipliers (16x CPU, 10x NB, and so on) are already set on Max by default in BIOS.
Unless you have a Black Edition CPU (you don't), you can't raise the CPU multiplier.

So, Overclock is achieved by raising the reference clock.

As you saw, reference clock is used to calculate all other frequencies too, so by OCing your CPU, you'll be automatically OCing the rest of the system too.
As good as this may sound, it causes a few problems.

Say the sample CPU from above can safely reach 4000Mhz (4Ghz). To get to this frequency, you'd have to set ref clock at 250, because 16*250 = 4000.
However, this will set the RAM to (666/100)*250 = 1665.
Most 1333 DDR3 sticks will not operate stable at that frequency.
It will also set the NB to 10*250 = 2500.
Some NB chips might not operate stable, or even safe, at those freqs.

Meaning - raising the ref clock overclocks everything at once, but not everything overclocks the same, or can overclock the same.
Therefore, as you raise the reference clock, you should monitor all the frequencies and use the respective multipliers to keep the freqs around stock.
Always Overclock only 1 component at a time!

In order to overclock the CPU, raise ref clock by 10Mhz.
This will give you (in our sample system)
16*210 = 3360 Mhz CPU freq.
10*210 = 2100 Mhz NB
6.66*210 = 1399 Mhz RAM

This is a very mild overclock. Raise by another 10 Mhz to get 3520/2200/1465.
Now these are better frequencies, but they may cause instability.
So we need to drop a few multipliers.

Drop NB multiplier to 9 (from 10). Will give 9*220 = 1980Mhz (which is very close to the stock 2000)
Drop RAM multiplier to 533 (from 666). Will give 5.33*220 = 1172.

Keep raising the reference clock by 10 until you can't log into WIndows.
On EVERY step check the NB and RAM frequencies - if they exceed the stock values by more than 100-300Mhz, drop the multiplier.
By the time you can't boot into windows, raise the CPU voltage by a little (for example, from 1.35 to 1.40, or from 1.40 to 1.45. Do NOT increase by larger steps)
After the increase in voltage, check if you can boot into Windows.
If you can, increase ref clock by another 10.
If you can't, start lowering the ref clock by 1 or 2 until you can.

After you have succesfully logged into WIndows, start testing for stability with Prime95 or LinX or IBT (LinX and IBT are easier to use).

They will crash. When they do, reboot and lower the ref clock by another 1 or 2.
Test again, until they stop crashing.

***During testing ALWAYS monitor your CPU temp using HWMonitor or similar***
***If temps get over 70C, reboot and reset voltage to Auto, lower Ref Clock by 5 or 10 and test again***

After all this is done, CPU keeps normal temp and LinX doesn't crash, you have found the max freq of your CPU. Congrats.

Now it's time to fix the rest.
Open CPUz, go to the SPD tab and write down on paper the values for different clocks.

Get back in BIOS and raise/lower the NB multi until NB reaches ~2500-2800Mhz max. I do not recommend NB OC higher than 2500. Some NBs have crappy cooling and can get permanent gamage due to heat.
Now go to the RAM section and raise/lower the multiplier until you get to stock clock (or close to that).
Then open the Timing/Latencies setting and *manually* enter the respective values from the piece of paper.

***Do NOT enter the values for the shown in BIOS DDR setting (be it 533/667 or other)***
Instead, calculate your REAL frequency with ((DDR setting)/100)*RefClock and enter the values for *THE PREVIOUS SPD FREQ*. (Frequencies in CPUz SPD section are halved - meaning 533=1066 real, 667=1333 real and so on)

For example, if your SPD tab contained (400: 7-7-7-22), (533:8-8-8-25) and (667:9-9-9-28) and your frequency is (400/100)*267 = 1068Mhz (= 534*2), enter 7-7-7-22 (because 534 is almost equal to 533).
This will give you a nice RAM timings near stock frequency, which are usually always stable, even with the cheapest RAM.
In case they are not stable (LinX crashes, BSOD or such), then enter the values that are right beneath the real clock, instead of the ones before them (like 8-8-825 in the above example).

Aaan that's about it

I will very soon convert this + more info, into a new ATHLON guide, I don't know what happened to the old one..

EDIT:

HEre's the link to the guilde, it's a bit more detailed:
http://www.overclock.net/amd-cpus/10...-friendly.html
Edited by ronnin426850 - 4/29/11 at 3:17am
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post #7 of 10
Quote:
Originally Posted by ronnin426850 View Post
I do not recommend NB OC higher than 2500. Some NBs have crappy cooling and can get permanent gamage due to heat.
Actually, you dont OC the NB on the motherboard, but you OC the IMC wich is directly on the CPU. NB overheating has nothing to do with overclocking your IMC, because the IMC is cooled by the CPU heatsink.

And maximum temperature should be 62C, not 70C.
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post #8 of 10
Quote:
Originally Posted by Devilmaypoop View Post
Actually, you dont OC the NB on the motherboard, but you OC the IMC wich is directly on the CPU. NB overheating has nothing to do with overclocking your IMC, because the IMC is cooled by the CPU heatsink.

And maximum temperature should be 62C, not 70C.
Could be.
But max temp for those chips is 75C according to AMD.
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post #9 of 10
Quote:
Originally Posted by ronnin426850 View Post
But max temp for those chips is 75C according to AMD.
My mistake, it seems to be 71C according to some sources because of the lower TDP.
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post #10 of 10
Quote:
Originally Posted by Devilmaypoop View Post
My mistake, it seems to be 71C according to some sources because of the lower TDP.
Strange, I can't seem to find where I read about the 75C...

Yes, it's 71 according to cpuWorld too
http://www.cpu-world.com/CPUs/K10/AM...0WFGMBOX).html

Maybe 75 was for the Rana?..

EDIT:
Yes, max temp for x3 - 75C, for x4 - 71C

http://www.cpu-world.com/Compare/79/...II_X4_640.html
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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