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AMD® Phenom™ II Overclocking Thread

Hey guys,

Just ordered myself a AMD Phenom II X4 Quad Core 955 Black Edition 3.20GHz (Socket AM3) & Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler

To go with my current Asus M4A78 AMD 770 (Socket AM3/AM2+) PCI-Express DDR2 Motherboard & Kingston HyperX 4GB (2x2GB) DDR2 6400C4 800MHz Dual Channel (KHX6400D2LLK2/4G)

Just wondered if anybody had some hints and tips to a good overclock for this lot ?

i also have OCZ Gold Edition 4GB (2x2GB) DDR2 PC2-8500C5 Dual Channel (OCZ2G10664GK) in another system would i get a better overclock if i swapped the RAM over for this OCZ stuff ?

Thanks James
 
Overclock1.jpg
 
is that vcore right? its a bit high i think. also im pretty sure cool and quiet is enabled as overdrive says its 800 odd mhz. temps are high as well.
 
I would swap the ram from the PC6400 to the PC8500 and then run the PC8500 at 800 mhz so you can raise the HT bus and the ram wont stop you. Also dont forget to raise the northbridge multiplier as its just more free speed.

1.512 is a lot of voltage for air cooling especially if your going to run it every day like that. You should be able to get 3.6 on stock voltage and only a small bump to get 3.7/3.8.
 
dfour said:
1.512 is a lot of voltage for air cooling especially if your going to run it every day like that. You should be able to get 3.6 on stock voltage and only a small bump to get 3.7/3.8.
Click to expand...
not every cpu (same model) clock the same with the same voltage ...

some are poor clockers than others.

also 1.512v is perfectly fine as long as the temps are below 55-60c
 
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x2 550, unlock to a quad core:D
I'm slowly overclocking !
Put i need to take down the voltage
Under water at the moment
TMPIN0 is my core temp
I hope i can reach 3.8ghz under 50c
4869020695_a046c7f062_b.jpg
 
gareth170 said:
not every cpu (same model) clock the same with the same voltage ...

some are poor clockers than others.

also 1.512v is perfectly fine as long as the temps are below 55-60c
Click to expand...

I agree all cores in the same batch can be very different when overclocked. His temps are not below 55 degrees according to his ss :eek:
 
dfour said:
I would swap the ram from the PC6400 to the PC8500 and then run the PC8500 at 800 mhz so you can raise the HT bus and the ram wont stop you. Also dont forget to raise the northbridge multiplier as its just more free speed.

1.512 is a lot of voltage for air cooling especially if your going to run it every day like that. You should be able to get 3.6 on stock voltage and only a small bump to get 3.7/3.8.
Click to expand...

i'm gonna change the RAM in a few days, i have hardly increased the Vcore tbh
 
My first ever overclock on Phenom 550BE :) Couldn't unlock it though.
How am I doing so far? Increased multiplier to x17 which took it to 3.4Ghz yesterday with no voltage increase and stressed it overnight. Fully stable on small FFTs. Intelburn test felt like it slowed the pc down more during testing, yet the temps didn't differ from orthos. I only had about 3 to 4c increase from idle with both.

Overclocked_intelburn_test.jpg


Overclocked_Orthos_8_hrs.jpg


Super pi at 1M went from 22seconds @ stock3.1Ghz to 20 seconds.
superpi_20secs.jpg


A friend has an intel e8400 dual core O/C'd to 3.6Ghz and he gets 12 secs Super PI@1M. By my calculations, it would take an impossible 4.6Ghz on my chip to achieve 12 seconds, so I don't really understand that.

Where do I go next, x17.5 or straight to x18? My target is as close to 4Ghz as possible. Should my stress test be blend, or is small FFTs sufficient? Should I now increase the vcore before going to x17.5 or x18?
 
Merlin5 said:
A friend has an intel e8400 dual core O/C'd to 3.6Ghz and he gets 12 secs Super PI@1M. By my calculations, it would take an impossible 4.6Ghz on my chip to achieve 12 seconds, so I don't really understand that.
Click to expand...

SuperPI just runs faster on Intel CPU's, dont waste time trying to match them, you never will.

And clock for clock Intel dual cores are between 10-15% faster than Phenom II's...



Merlin5 said:
Where do I go next, x17.5 or straight to x18? My target is as close to 4Ghz as possible. Should my stress test be blend, or is small FFTs sufficient? Should I now increase the vcore before going to x17.5 or x18?
Click to expand...

Your very unlikely to get 4ghz (stable) with a 550, they normally max out stable (like mine) @3.8Ghz with voltages upto 1.5v...

If i were you, i'd go for x18 @ 1.42vlts.....

Above 3.6Ghz and you need to start ramping up the voltage towards 1.5vlts, and the extra 200mhz really wont be noticable in games or apps...
 
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Merlin5 said:
Thanks Cooper. Will the difference from stock 3.1ghz to 3.6ghz be noticeable in games though? Otherwise, this just becomes an exercise (an interesting one at that) in overclocking, without any real world benefit.
Click to expand...

It should give you a bonus in max frames but the biggest difference should be in the minimum frames you will get so it could make teh game seem smoother as your min frames will be higher.
 
Merlin5 said:
Thanks Cooper. Will the difference from stock 3.1ghz to 3.6ghz be noticeable in games though? Otherwise, this just becomes an exercise (an interesting one at that) in overclocking, without any real world benefit.
Click to expand...

Remember to OC the HT, NB and tweak ram speed and timings, these are little differences but they add up and if you tweak everything out along with cpu clock well you'll see a huge improvement in total performance.
 
Ive noticed the phentom uses a bus speed of 200 and the memory gets boosted up to 400 using a diff option in the bios, why is this. Like I have a intel system and my bus speed is 400 and this makes the memory run at 400 too.
 
eh?

That's nothing to do with the CPU, it's called cpu/ram fsb ratio, when set to 1:1 will use same FSB for cpu and ram. Also you choose in BIOS if you want to have "locked" ratio which with every increase to cpu fsb, increases the ram fsb as well or unlocked where you can set up a separate fsb for both.

If you set your ratio to 1:1 and linked ( locked ) and set 400mhz on phenom II, ram will automatically get set to that as well.

The only thing you have to take into consideration is that different CPUs have different multiplies and some won't do 400mhz, phenoms are easier to OC with unlocked multiplier than just pumping the fsb like u have to do on intel.
 
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