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GA-78LMT-S2P with Phenom II x4 955 OC

post #1 of 8
Thread Starter 
Good evening. I need your help, you are the experts in this area. I built a pc recently. It has the following parts:

CPU: AMD Phenom II x4 955
MoBo: GA-78LMT-S2P
GPU: ATI RADEON HD 6850

It has the stock fan and thermal paste. I have Thermaltake TG-2 thermal paste, but I didn't use it because it was my first time build and I didn't want to make a mess. I have a closed case with a small fan of 80mm to blow air into the case.

The motherboard has 4+1 phases, support up to 140W and Low RDS (on).

I have been trying to undervolt and overclock the processor at the same time. Until now I have been lowering the voltage and running prime95 (blender test) watching for temperatures. After many tests, the last time I ran prime95 with 1,25V on the Cpu voltage and 3.4GHz (x17 multiplier). Cool n' Quiet upped my voltage to 1,26V. I ran stable for 1 hour and 10mins aproximately and then it crashed. My maximum temperature with prime95 was 54°C, but it was for a really short period of time, mostly it was at 52°C under load.

I'm afraid of blowing up the motherboard. Speedfan reports the following temperatures:
Temp1: 47°C
Temp2: 57°C
Temp3: 63°C

For what I've seen in internet: Temp0=CPU, Temp1=Mosfet, Temp2=NB. Are those temps dangerous? I just want to overclock the processor only. Thank you so much.
post #2 of 8
These processor shouldn't go over 62°C

I don't think you will be able to "blow up" your motherboard! That crash might have been the safety automatic shut off at 63°C (Temp3: 63°C).

Try reseting to default CPU settings and resiting the cooler then try overclocking again or with a better cooler the stock cooler are only suitable for slight overclocking.

If you get a new cooler for overclocking I HIGHLY RECOMMEND using the Corsair H60 Hydro Liquid Cooler!
Hope this helps! thumb.gif

Edited by Lieutenant_95 - 11/11/11 at 8:07am
post #3 of 8
Thread Starter 
Quote:
Originally Posted by Lieutenant_95 View Post

These processor shouldn't go over 62°C
I don't think you will be able to "blow up" your motherboard! That crash might have been the safety automatic shut off at 63°C (Temp3: 63°C).
Try reseting to default CPU settings and resiting the cooler then try overclocking again or with a better cooler the stock cooler are only suitable for slight overclocking.
If you get a new cooler for overclocking I HIGHLY RECOMMEND using the Corsair H60 Hydro Liquid Cooler!
Hope this helps! thumb.gif

Thanks for your quick answer. I won't be getting a new cooler soon (they are too expensive in here). I don't want to do a serious overclock either, I would be happy to get to 3,6GHz with stock cooler. I will apply my custom thermal paste soon to see how much can I drop the temperatures.

So 63°C for the NB are dangerous temperatures? Do you know where can I find safe temperatures for my motherboard? I have been looking around and I don't find it headscratch.gif

I will up my voltage to 1,2750V this afternoon to see if I get 3,4GHz stable.

Even if I'm overclocking the cpu only, should I manually set the ram timings and all that stuff? I have everything on AUTO

I'm using AMD Overdrive right now, after I find a stable setting I will set it in the motherboard Bios
post #4 of 8

The VRms on this motherboard are protected with automatic shut off on overheat.  However, I highly recommend that (to prevent more of these shutoffs from happening, in addition to improving safety) you cool your VRMs (heatsink, fan) before any overclocking is to take place.

post #5 of 8
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post

The VRms on this motherboard are protected with automatic shut off on overheat.  However, I highly recommend that (to prevent more of these shutoffs from happening, in addition to improving safety) you cool your VRMs (heatsink, fan) before any overclocking is to take place.

Hi. It didn't shutoff, it crashed (showed the blue screen saying the processor did something wrong), so my guess is that it did that because of the low voltage of the CPU, correct me if I'm wrong. I have already an 80mm fan blowing air into the VRMs, it isn't very fast but it blows some air. My MoBo sets the CPU at 1,41V by default, which I think is really high, so that's why I'm undervolting, and I'm taking the chance to overclock also. I don't want to do a high overclock, I want to get 3,6GHz maximum. Should I fix the ram timings if I only want to overclock the CPU?

BTW, I'm your fan xd_1771 biggrin.gif I see you at every post on this forum (I have been reading it for a while without posting anything), nice to meet you tongue.gif
post #6 of 8
If you are extremely concerned about the motherboard temperature you could install some case fans to increase air flow though the case although it should be safe.

When overclocking the CPU their is no need to overclock the RAM as you won't really notice a difference! maybe a extra point or two in a benchmark test.

If you are new to building computers and never applied thermal paste you can find videos on YouTube. Try NOT apply TOO much! It will not increase cooling performance and your CPU can get stuck to the heatsink after time.
You only need a thin layer or "pea" sized blob of thermal paste. thumb.gif
post #7 of 8

If you're overclocking by CPU multiplier (black ed CPU), there's really no need to make any extra RAM adjustments...

post #8 of 8
Thread Starter 
Ok. Thank you so much guys! As you said xd_1771 I'll be only overclocking by cpu multiplier, so it's good to know that.

For anyone that want to know about this motherboard: The capacitors are made by the japanese company Nichicon, the model is LF and those are "CONDUCTIVE POLYMER ALUMINUM SOLID ELECTROLYTIC". Wikipedia say that those capacitors usually have 50000 hours life at 85°C, that would be 5 years and 8 months using it 24/7 at 85°C, they increase their life at lower temperature. Their product specification pdf is in this link.

Now I'm going to research about this motherboard mosfets.

Edit:

And BTW, I have been trying the system stock, doing some gaming and this are the temps I got
Cores: 52°C
TPIN0: 49°C
TPIN1: 65°C
TPIN2: 63°C

So I guess those are my normal temps frown.gif
Edited by agroferia - 11/12/11 at 5:21am
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