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Temps OK, and how to automatically throttle?

post #1 of 13
Thread Starter 
Short version: I'm easily hitting 62 degrees under load on my 1055t (3.5Ghz / 1.2875v) with an H50 cooler. Is this really right? And is there a way to throttle back my CPU multiplier once it hits 60 degrees? Googling hasn't found anything.

Long version: So I finally figured out that it was the overheating mosfets on my ASUS M4A78LT-M motherboard that were causing by CPU to be throttled back to the half multipler (x7.5). (I changed round the top fan to blow on to the mosfets).

I have an H50 water cooler fitted with a single Corsair NF-P12 (tomorrow the second fan arrives and I will change this to a push-pull config). FSB is 250Mhz, HT 2000Mhz, CPU at 3.5GHz, 1.2875v.

Ilde core temps are usually around 24 degrees, but the ambient temp here today is unusually hot and the cores are at 33 degrees (42 CPU temperature).

Before I cooled the mosfets when the CPU reached around 55 degrees the motherboard would throttle back the CPU, and after a very short while let it ramp back up again. Prime95 couldn't run continuously at 3.5Ghz but my video rendering loads could.

Are these temps right for an H50?

Now I've cooled the mosfets the temperature of the CPU sails past 55 degrees under Prime95, hits 62 degrees and the machine shuts down. Turns out that the throttling mosfets were actually helping out - having a machine shut down halfway through a giant render is very, very bad!

Is there a program out there that will monitor CPU temp and throttle back the multiplier when it crosses a threshold? I can't find anything.

I'm actually tempted to change back the fan orientation and start letting the mosfets throttle again!
post #2 of 13
I don't think there is a way of doing what you want. Try to reseat the cooler and appyl new thermal paste. that's not such a high OC for it to be reaching those temps. If you are only giving us core temps, 62C is really hot, as that trasnlates into a possible over 70C CPU temperature. If remounting doesn't work, reduce your OC and go back to factory settings.

You should look if the fan on the H50 is running at full speed. for that, disable CnQ in Bios, or set it to Performance mode or whatever it is called in your board
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post #3 of 13
Thread Starter 
Those temps were the CPU temps, the core temps are almost always 10 degrees lower.

I've already tried reseating the H50 annoyingly. I used Asaka 455 thermal paste.

CnQ is already disabled. I'm tempted to wire the radiator fan directly to a molex rather than the CPU fan so it's always definitely at maximum. At the moment the core temps are sitting at around 37 degrees which is really high. I think yesterday they were 10 degrees less than that, so maybe changing the fan directions around has really compromised the H50 cooling (but left the mosfets cooler). Or perhaps it's because we hit 33 degrees in London today.

I'll check the temps when it gets cooler again and if it's still hot then I'm gonna change the fans back to the previous configuration and maybe stick some RAM heatsinks on the mosfets.
post #4 of 13
Please fill http://www.overclock.net/specs.php?do=addsystem
So we can know more about your rig.

Your case has proper air flow right ? I mean with watercooling you still need to get air into it, then out of it. My cpu is configured for 3500->3900 turbo core enabled, idle is 33c with all cores at 3500 at stock voltages which is higher than yours. The load temp is 45c. Room is 30C+ and i'm on air cooling.

I suppose there's no pump speed right ? Maybe try a better case fan on the radiator. How much tim did you use btw ?
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post #5 of 13
Thread Starter 
Quote:
Originally Posted by Catscratch View Post
Please fill http://www.overclock.net/specs.php?do=addsystem
So we can know more about your rig.

Your case has proper air flow right ? I mean with watercooling you still need to get air into it, then out of it. My cpu is configured for 3500->3900 turbo core enabled, idle is 33c with all cores at 3500 at stock voltages which is higher than yours. The load temp is 45c. Room is 30C+ and i'm on air cooling.

I suppose there's no pump speed right ? Maybe try a better case fan on the radiator. How much tim did you use btw ?
Hi, thanks for the answer. I'll fill out the rig info in detail once I'm home, but roughly:

ASUS M4A78LT-M (this is a 4+1 board, on the latest BIOS)
AMD 1055T (will need to check if it's 125w or 95w but I believe it's 125w)
8GB (4 x 2GB) DDR3 1333Mhz
Palit Geforce 460GTX 1GB
Fractal Design Arc Mini Case
H50 Cooling (reports ~1400rpm from the chassis fan connection)
750W PSU

FSB is 250Mhz
CPU voltage: 1.3
CPU Multiplier: x14 = 3.5Ghz

HT, NB and memory are throttled down so they run stock speeds against the overclocked FSB.

I have the following fan setup:

Front Intake: Fractal Design 120mm fan @ 1200rpm
Side Intake: Fractal Design 120mm fan @ 1200rpm
Top Exhaust: Fractal Design 140mm fan @ 1000rpm
Rear Exhaust: H50 with Noctura NF-P12 (connected to CPU fan-slot, reports ~1400rpm)

The fan I received with H50 is currently sitting spare so I could connect that up in another position - the front, bottom and top all have another free fan mount.

I've got another Noctura NF-P12 arriving today which I will fit in a push-pull configuration sandwiching the H50. I know the Corsair recommendation is to configure the fan as an intake but if I do that it will blow the warm air right over the motherboard mosfets and it seems contrary to having good fan to back airflow.

I suspect I may have used too much TIM when I reseated the H50 - I read the stuff about it needing to look nearly transparent afterwards - so I'm going to give that ago next.

Do you recommend placing the TIM on the CPU or the H50? Spreading it, or putting a small blob in the middle and letting it spread out when the heatsink is applied?
post #6 of 13
Thread Starter 
OK. I've just fitted the second Noctura fan to the H50 and reseated the water pump, this time placing a pea sized blob on the middle of the CPU and then just fitting the pump on top.

Using the AMD Overdrive stability test I currently get 55 degrees CPU temp, 39 degrees core temp, 40 degrees motherboard temp. Hard drives temps are 30 degrees so the case air seems pretty damn cool.

This is all much better than I had previously, but I can't help but think it should be running cooler than this still? (Ambient temperature is around 20 degrees at the moment) Ideally I'd like to get another .2 or .3 GHz out of this rig.
post #7 of 13
where do you have the h50 power coming from ? the cpu fan header or the chassis fan header ?
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post #8 of 13
Thread Starter 
I've wired the H50 fans off of the CPU fan (as per the Corsair instructions), using a Y-splitter as I have two fans.

I've wired the H50 pump off of the chassis fan motherboard connector. Do you think I should move this to a power molex?
post #9 of 13
Looks like you've hit a somewhat complicated situation.... when the MOSFETs weren't cooled, the throttling (VRM temps should have been significantly hotter) prevent the CPU from hitting the >55C load temp. Now that they are, the CPU can more safely operate.... resulting in over temperature on the CPU.
I'm thinking this is happening due to heat add-up over time, or the cooling is generally incapable of moving the heat added up otherwise. On my NH-D14, I hit a load temp and it pretty much stays there during any load. This is due to a very good mounting in my case. Check your H50 mounting.
You might want to move the pump to the molex, as some motherboards control fan ports via voltage....
Edited by xd_1771 - 8/5/11 at 2:30am
post #10 of 13
There's also the possibility that it just can't handle an overclocked 6 core.

Take a look at here.
http://forums.whirlpool.net.au/archive/1502928
He seems to solve it by setting the fans as intake, so getting cold air from outside. He also has better fans.
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Intel Evilnow
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