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Cranking the Phenom II 965

post #1 of 10
Thread Starter 
This is my first OC attempt on any CPU ever. Equipment is listed in sig rig.

I've been focusing on reference overclocking. I managed to get up to 3.9 GHz with minimal voltage increases (set to 1.33 in BIOS, measured a little higher in Windows). NB at that level was set to 2700 MHz, HT kept as close to 2000 MHz as possible. These settings passed a 1 hour OCCT and five hours of Prime95 (more extensive testing to come if I adopt this one permanently).

Once I hit 3.9 GHz I started running into problems. I tried the "MOAR VOLtAGE!" technique, bumping CPU/NB on Blue Screens and bumping Vcore on black screens. Right now I'm passing the 5-minute Prime95 "does Windows crash" test, but temps spike at 55C and stabilize at 53C, which I'm not comfortable with. Overall settings for this level are as follows:

Core Speed: 4050.3 MHz
Core Voltage: 1.428 V
CPU/NB Voltage: 1.43 V
Multiplier: x15.0
Bus Speed: 270 MHz
HT Link: 1890.1 MHz
NB Frequency: 2430.1 MHz
RAM Effective: 1440 MHz
Timings: 9-9-9-24

Should I roll it back and accept the 3.9 GHz as the max for this rig, or is there a better way to crank 4 GHz out of this system?
post #2 of 10
You dont need your bus speed that high, since increasing your bus speed increases everything else and creates more heat. Decrease your bus speed to 230 and increase your multiplier to 18. That should give you over 4.0
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post #3 of 10
Here is were I'm @(Stable)
Core Speed: 4.04
Core Voltage: 1.51
CPU/NB Voltage: 1.30
Multiplier: x16.0
Bus Speed: 253
HT Link: 2024
NB Frequency: 2783
RAM Effective: 1686
Timings: 8-8-8-24
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post #4 of 10
Thread Starter 
Thanks! Seems like bus speed was it. Lowered it to 250 MHz and bumped the multiplier up to 16 to get an even 4 GHz. NB at 2500 MHz, HT even 2000 MHz, voltage set to 1.345 in BIOS (this mobo overshoots it by 0.05 when stressed) so I'm measuring 1.392 in Windows. CPU/NB Voltage set to 1.33. Temps max at 51C and fluctuate between 48C and 51C.

Core Speed: 4.00 GHz
Core Voltage: 1.392 V
CPU/NB Voltage: 1.33 V (Don't know where to measure in Windows, prolly 1.38 V)
Multiplier: x16.0
Bus Speed: 250
HT Link: 2000
NB Frequency: 2500
RAM Effective: 1333
Timings: 9-9-9-24

Can't get anything else from the timings. Going below 9 leads to instability of various apps in Windows (fairly confident memtest86+ would turn up errors).

Now I'm going to run OCCT for an hour and then benchmark to see what I'm getting.

Any good free CPU benchmark tools? Was thinking hyperpi and look at how long it takes to finish, but was wondering if there's anything out there more gaming relevant.
post #5 of 10
Thread Starter 
Okay may be doing a little necro here but I felt this thread was most appropriate.

So far every 4.0 GHz attempt has failed. My best attempt is what I have right now:

Clock Speed: 4014.8 MHz
Mult: 18.5
Bus Speed: 217.0 MHz
HT Link: 2170.0 MHz
NB Frequency: 2604.1 MHz
Core Voltage: 1.452 V
CPU/NB Voltage: 1.15 V

This set-up passed 3 hours of OCCT. It was going along fine in Prime95 but failed at the 7-hour mark on a really small FFT. I'm thinking just a little more core voltage. Temps are maxing out at 55C but usually stay around 50C when a little RAM is used. I also may try to lower CPU/NB Voltage a little more to get a little more head room on temps.
post #6 of 10
If you haven't read this thread it may save you some time while using Prime95 when it fails at 8+hrs.
http://www.overclock.net/general-pro...-settings.html
Saved me a bunch of time when I was getting failures at the 19-20 hour mark.
Good luck!!!
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post #7 of 10
High Five! @ Sandman. Preach the word!

Eh, those numbers seem a bit off for me to be stable.

I think you're being too conservative on your voltage especially with the CPU-NB voltage.

Also you'll probably need to upgrade your cooling system. My Hyper 212+ with push/pull config isn't enough to keep my comfortable with my temps at 3.8ghz (on a x4 955). For me comfortable is under 55 under load in prime95 but each to their own.

As Sandman said, the large FTT test will stress your IMC (CPU/NB) so if you fail in the large FTT test, throw more CPU-NB voltage. For 2600ish mhz. You'll probably need anywhere from 1.25-1.4v.

Also to tighten your ram timing, try throwing more voltage at the ram. It should be another setting in your BIOS.

Edit: My guess is you'll need a CPU vcore of 1.475v and CPU-NB voltage of 1.375 to be stable (roughly for the speeds you have set). It also could just be your setup combination. My setup hates any ram divider aside the stock one.


Also CPU-NB voltages affect the CPU temps more than CPU voltage (from my experience). Try dropping your NB freq down.

Also finding if your CPU-NB voltage is high enough for the setting, you'll get BSOD's that are related to the CPU voltage (I originally thought they were all IMC/RAM related).

Good luck!
Edited by evilferret - 1/22/11 at 10:30am
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post #8 of 10
Right back at cha evilferret! lol.
If you want more out of that Mugen II I'd recommend a pair of Scythe Gentle Typhoon AP-15's (1850 rpms) in a push pull config. It gave me 5c better cooling under load and after adding a shroud to the push side I got another 2-3c drop under load with prime95. I now have my 1090T max load temp at (a spike of 54c) but normals runs between 49-51c with 4013MHz and NB 3000MHz with ambient at 21.2 (70F) during a 24 hr run.
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post #9 of 10
Trying to hit 4ghz myself

I can hit 3.7 stable on stock volts just a multiplier increase
To hit 3.8 stable i must increase volts to 1.425 is it normal for that much increase just to get 100 extra mhz topping out at 48c at 3.8ghz
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post #10 of 10
Thread Starter 
Think I finally got it. I posted this in a couple of other threads. I kept Vcore set at 1.4 V in BIOS, lowered ref clock a little more to 211 and bumped up the mult to 19 and that got it:

Core Speed: 4009.2 MHz
Mult: 19
Bus Speed: 211 MHz
HT Link: 2110 MHz
NB Frequency: 2532 MHz

Vcore: 1.452 V (CPU-Z)
CPU/NB V: 1.15 V (BIOS)

Max temps at 54 C in IntelBurnTest. Overnight Prime95 peaks at 57C. May try re-seating the heat sink for that or changing to new fans. I can also adjust some fan speeds in the case; I may try that as well.

I didn't actually change the CPU/NB voltage. AMD has it at around 1.075 V max in their spec sheet and I tested the IMC at 2532 MHz with 1.15 V CPU/NB at lower core speeds before I tried bumping up the core clock. Got everything Prime95 (8 hours), OCCT (3 hours), and memtest86+ (8 hours) stable using the settings above.

In any case seems like I'm good to go. Thanks, everyone!
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