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My overclocking experience with the Phenom II 720

Last response: in Overclocking
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March 20, 2009 4:59:57 PM

Almost all the OCing I've seen reported has been done on the 790 chipset, I will be doing my OCing on a 780g chipset. There shouldn't be any real differnce in OC potential but I wanted to point that you. The big changes with 790 chipset was crossfire support, fasted IGP and the SB750 northbridge which as ACC. The Phenom II is supposed to have ACC built into the chip but as far as I know I have no control over the ACC unlike you would in BIOS under the 790s. Anyways, this is just my isolated experience that I'll be posting as I go along.


http://www.newegg.com/Product/Product.aspx?Item=N82E168... Asus 780v motherobard
http://www.newegg.com/Product/Product.aspx?Item=N82E168... 4x2GB Corsair XMS2
http://www.newegg.com/Product/Product.aspx?Item=N82E168... AM3 X3 720
http://www.newegg.com/Product/Product.aspx?Item=N82E168... Xigmatek SD1283
http://www.newegg.com/Product/Product.aspx?Item=N82E168... Artic Silver 5 Compound

Just wanted to share my OCing trial with the Phenom II 720 on the a 780v platform. I received the parts yesterday and started working on getting the system ready this morning. After about an hour and half, I had all my drivers, basic apps installed and windows updated. The cooler was alot easier to install than my previous which was a Thermalright 120 on an AMD 64x2 4200+ in a S939 board. The only hassle was prepping the bottom the of the cooler which had a lot of sticky residue on the bottom after I removed the protective film that was covering it.

I'll be doing all my adjustments in AMD overdrive. I have disabled all the BIOS features recommened in Tom's Hardware's How To guide.
http://www.tomshardware.com/reviews/phenom-overclock-at...

On boot up the idle temp was 34 and the core was 23. I ran prime 95 under the "in place large ftt max temperature, power consumption" toture test for about 15 minutes and the temperature rose to 40. My first attemp at an overclock was to move the multiplier from 14->17. After 20 minutes the CPU temperature was 43 and the core 30.

Next 17.5.

After about 10 minutes it crashed. I turn on the fan you see above in the picutre and tried again. After 10 minutes it crashed. The CPU temperature was 38 and the core was 28.5 at the time of the bluescreen. I've now increased the voltage to 1.275 (up from 1.250) and trying again for 17.5 with the fan on.

I've decided I'm going to try with the fan on to see what the max will be for the CPU and then scale it down afterwards.
All stability tests are done in P95 in the "in place large ftt max temperature, power consumption" test. I think this is the most stressful of all tests.

3:37pm After 18 minutes its stable. CPU is at 38 and the cores are at 29.5. I'll bump the multiplier to 18.
3:44pm After only 1 minute the system blue screened. I'll be moving the voltage to 1.300 (up from 1.275) and keeping the multiplier at 18.
4:03pm The system was stable. The CPU was at 40 and the cores were at 31.5. I'll bump the mulitplier to 18.5.
4:07pm Almost immediately after starting P95 the system crashed. I'll move the voltage to 1.325 and keep the multiplier at 18.5.
4:15pm Again, almost immediately after starting P85 the system crashe.d I'll move the voltage to 1.350 and keep the mulitplier at 18.5.
4:20pm I let the system idle for a couple of minutes the CPU temperature is 31 and the core temperatures are 21-22.
4:27pm The system lasted like 30 seconds this time before crashing, this is an improvement. I'll move the voltage to 1.375 and keep the multiplier at 18.5.
4:45pm The system is stable after 15 minutes. I'll move the multiplier to 19.0 while keeping the voltage at 1.375.
4:51pm I let the system idle for a couple of minutes the CPU temperature is 31 and the core temperature is 21-22.
4:55pm Almost immediately after starting P95 the system crashed. I'll move the voltage to 1.400 and keep the multiplier at 19.0.
5:03pm The system lasted about 30 seconds before crashing. I'll move the voltage to 1.425 and keep the multiplier at 19.0.
5:10pm The system lasted about 1 minute before crashing. I'll move the voltage to 1.450 and keep the multiplier at 19.0.

I just realized that the system has stopped blue screening and just have the screen going out of wack and then rebooting. I'm not sure when it stopped blue screening though, I'm not sure what this means either, anyways moving forward.

5:32pm The system after about 20 mintues blue screened. I'll move the voltage to 1.475 and keep the multiplier at 19.0. The CPU temperature was 47 and the cores were 40 at the time of the crash.
5:54pm The system is stable after 20 minutes. I'll move the multiplier to 19.5 and keep the voltage at 1.475. The CPU temperature was 49 and the cores were 41.
6:04pm I let the system idle and the CPU temperature is 36 and the core temperature is 26.
6:08pm The system blue screened after about 10 seconds. I'll move the voltage to 1.500 and keep the multiplier at 19.5.
6:14pm The system blue screened after about 30 seconds. I'll move the voltage to 1.525 and keep the multiplier at 19.5.
6:18pm The system blue screened after about 10 seconds. I'll move the voltage to 1.500 and keep the multiplier at 19.5. Is this it?
6:23pm The system idle temps are at the CPU 38 and the core 34.
6:29pm The system blue screened again after about 10 seconds.

Well thats it, looks like my maximum is going to be 19.0 (3.8Ghz) OC at 1.475volts. The temperatures are fine, but I'll have to do an overnight test to make sure the system is stable at that speed.

Saturday... I ran the P95 "small ftt" test for 10 hours and the system was stable. Multiplier was 18.5 and the voltage 1.425. I'll try 1.400 volts next at 18.5 multiplier.

Any suggestions or comments are welcome.
a c 141 à CPUs
a b K Overclocking
March 20, 2009 5:18:15 PM

By "sticky residue," I'm assuming you mean the included TIM, before you put on your AS-5...
March 20, 2009 5:22:39 PM

Uh-oh. I hope not. The instructions didn't refer to it anyway. The instructions read "before installation, peel the protect label on the bottom of the heat sink base off." "...apply thermal grease..." I hope the term label clears things up it just seemed like something on the cooler to protect it from being scratched.

I hope it was just the stickness from the protective layer and not anything I would of needed... I've gone too far now anyways.
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a c 141 à CPUs
a b K Overclocking
March 20, 2009 5:24:17 PM

Sorry, I edited my original post. If you got some AS-5, then that's the thermal compound you needed, and likely better than whatever came with it.
March 20, 2009 6:29:22 PM

Anyone know what are the "safe" voltages and core temperatures you can run your Phenom II's at?

edit: I was told anything under 60/60 is good.
May 14, 2009 10:21:14 PM

( Newbie ) How can you see the temperatures while Overclocking ?

From what i see you were always aware not passing the 50 C of loaded CPU , right ?

thanks .
May 15, 2009 1:26:59 AM

I use speedfan (free software) to monitor the temperatures and/or AMD's overdrive.
May 18, 2009 11:19:11 AM

After you finished the o/c process did you turn on the cool'n'quiet and stuff or did you keep them disabled ?
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