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Help me reach 3.6ghz + on Phenom II x4 945 c3

post #1 of 24
Thread Starter 
I've reached a wall in my overclocking. I cant seem to get my Phenom to go over 3.6ghz. Tried running it on 1.375v on prime95 but one core fails on me after 1 hour. I have tried increasing my nb but still the core fails. I've tried increasing the volts but to no success and running prime 95 will cause a Black screen of death after 10 min. Have I reached the limit for my cpu or am I doing something wrong?

I planning to target 3.8ghz or more but im stuck on getting it to 3.6ghz.

Atm i am running my stable OC of 3.55 ghz 1.375v on my Phenom II x4 945 c3 passing 7 hours of prime 95 with 56 degrees celsius max temps.
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post #2 of 24

Because of the extremely limited and cramped AM2-era 3-phase power VRM design I highly recommend you back off from overclocking a quad core on this processor and get a new mobo.

 

If you don't have the processor stock cooler with you, your VRMs get no cooling and you need to undervolt and underclock to permit safe operation.

 

Better chipset might enable a better OC anyway.

post #3 of 24
If more volts wont get you there, then I'm inclined to agree that you'll need to upgrade your MB. My 945 was my first significant overclock, and I had issue breaking 3.5, then 3.6, but after enough trial & error I ended at 3.81ghz. This was on a Biostar TA990FXE motherboard.



Edit: Curious...How much voltage did you try?
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post #4 of 24
Thread Starter 
Quote:
If you don't have the processor stock cooler with you, your VRMs get no cooling and you need to undervolt and underclock to permit safe operation.

can you please elaborate on this part? I do have the stock fan my phenom II x4 and why should I downgrade my cpu fan to stock when im getting better temps on my cooler? Is it because the fans are oriented on a different way?

Ive been running my Phenom II x4 945 @ 3.4 ghz at 1.350v using the stock fan for about a year now with no probs whatsover.
Quote:
Edit: Curious...How much voltage did you try?

I tried the next step in my bios 1.400 up to 1.475 with no avail. Im actually incilining to agree that I need a new Mobo XD
Edited by jadariin - 12/1/12 at 9:57pm
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post #5 of 24
Yes,I think he's referring to the fan orientation. The stock cooler blows down, creating airflow over the vrms as it blows down & away from the cpu. A tower type heat sink will generally not produce the same effect. I am inclined to say that you could benefit from a new cooler, especially if you want to keep pushing. Even a cheap heat sink/fan would probably do wonders. OR swap your 945 cooler for one of the improved stock coolers that came with the higher end Phenom IIs.

Anyway, if volts aren't helping, and your temps are good, as you stated, then it's time for an upgrade :|

Also, consider that your processor may just not like it. You're already 550 mhz over stock, and while I think more is possible, you must also concede that some chips wont give great numbers, no matter how much you coax them.
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post #6 of 24
Thread Starter 
Oh alright. Can I remedy that by adding more case fans blowing directly on the motherboard? I think I will stick with my current setup then.
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post #7 of 24
What temperatures are you reaching during your stability testing ?

Didn't see 56C max temps.

Do you have temperature readings for the VRMs?
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post #8 of 24
Quote:
Originally Posted by jadariin View Post

Oh alright. Can I remedy that by adding more case fans blowing directly on the motherboard? I think I will stick with my current setup then.

You can but the VRM's are your board are not designed to push a 125W quad core effectively & overclocking is not helping. It is an extremely low-end design. I'm sure your CPU can handle ~4GHz(since you have a C3 revision), but there is no way you will get it with those low end VRM's. You will need a new motherboard.
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post #9 of 24

The VRM design on your board was designed for AM2 dual cores.

It was not originally meant for Phenom II quad cores, let alone the split power phase on all newer Phenom II/Athlon II processors. Pushing a quad core is really pushing it.

 

Oh, so was your chipset. You could probably nail another 200Mhz on a 760G board and better on something like a 770 board with no IGP whatsoever.

 

Start looking for an inexpensive switch maybe? I personally like the inexpensive cost for good features on the ASRock 770 iCafe.


Edited by xd_1771 - 12/2/12 at 12:21am
post #10 of 24
Thread Starter 
Quote:
You can but the VRM's are your board are not designed to push a 125W quad core effectively & overclocking is not helping. It is an extremely low-end design. I'm sure your CPU can handle ~4GHz(since you have a C3 revision), but there is no way you will get it with those low end VRM's. You will need a new motherboard.

Its a 95w not 125w if it helps ease my mind a little

Ill try finding a new Mobo suggestions? Im actually eyeing this one since Im not to keen on buying a new ram set yet. http://www.asrock.com/mb/NVIDIA/N68C-GS%20FX/
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