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How can this be? Nearly identical results with two heatsinks not even in the same league.

post #1 of 14
Thread Starter 
So I've been scratching my head and wondering how on earth it's possible. but it seems that my Xigmatek Gaia (SD1283) and my Xigmatek Aegir are yielding nearly identical temperatures on my OCed FX 8350.

Every test I've seen shows a 3-5 degree gap between the two, but not in my case, it just stays the same.


The only explanation I have is that the 120mm Delta PWM fans I've been using for both coolers render a bigger cooler ineffective, but this just doesn't feel like a satisfactory answer to me.


Has anyone had anything similar to this happen to them?
post #2 of 14
1.) Case airflow might keep both fans at the same temperature. I've had had a case airflow bottleneck problems in the past. I tried this experiment: I opened the side of the case, and had a massive box fan blow a ton of air into the case...and i found that missing 3-5 degrees. It's usually a lack cool air into the case problem.

Just curious, did you upgrade from one Xigmatek cooler to the other?
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post #3 of 14
There are also quiet big production deviations, especially if we look at coolers with just tucked on Fins and no soldering at all, like most xigmatek/pccooler products. Direct Touch is especially sensitive to this, too.
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post #4 of 14
At what CPU load were these temps being take at on your computer?

If at idle it's not at all surprising.

Also if you CPU is not a high watt you won't see as much difference even under heavy load as reviews show when overclocking CPU and using higher voltages.
post #5 of 14
Thread Starter 
Quote:
Originally Posted by doyll View Post

At what CPU load were these temps being take at on your computer?

If at idle it's not at all surprising.

Also if you CPU is not a high watt you won't see as much difference even under heavy load as reviews show when overclocking CPU and using higher voltages.


At full load on all the cores. Two different motherboards actually and two different cases, but the motherboards were both Asus 6+2 phase digi power designs (actually this new one has 6+2+2 IIRC).


Temps were at 4.4ghz and 1.33-1.35v. When swapping this particular FX into this case, I decided to open it up full out if I could. I can get 4.7ghz out of it Prime stable but it jumps past 65C which is a no no for these chips. I should have tried it at those settings with the Gaia, that might have given me more relevant information. I know I'm cooler limited as I can push this chip farther than the cooling allows, but after 10 mins it goes into thermal throttling mode. I should see what I can do with the FX 8350 in the other machine and compare that way.

Airflow... well that's not an issue smile.gif.

On the top I've got twin 120mm fans which draw around 80-90CFM each (they came off my antec Kuhler 920), and on the back I've got a 120x38mm fan which pushes 90CFM all day long if need be (panaflo smile.gif). Both Xiggys had 120x25mm Delta PWM fans on them. Switching from a pair of Cougar Vortex 120mm PWM fans rated at like 70CFM each netted me an extra 1-2 degree drop with the top fans. I've got another couple of Deltas on route (man I love working pulls, I paid less than 5 bucks a piece for them). I may put one in the back and go for a push/pull setup on the heatsink, although I think I'll see diminishing returns.
post #6 of 14
Bad thermal past application? Could easily lead to a 3-5C difference.
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by ohhgourami View Post

Bad thermal past application? Could easily lead to a 3-5C difference.

One application with Prolimatech PK3, one with a mix of PK2 and PK3 (mostly PK3), and one with AS5.

I'd like to tighten the cooler down a bit more though, but cannot with the crappy plastic backplate provided with the Aegir. The mobo will warp at extreme torque levels. Oddly enough, the Gaia has a much nicer metal backplate.
post #8 of 14
Not talking about what you used, but how much you used with what method?
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post #9 of 14
Does it heat up as fast with case open as closed?

Airflow could very well be the issue. Too much airflow in the wrong places is sometimes worse then too little

Smooth airflow is very important.. and the faster the fans move air the more important ti becomes because the more turbulence the air can create.

Is your top front fan in front of cooler intake fan?
Air moving too fast across the front of a fan will not flow into fan as well as no airflow in front of fan. (only airflow going into fan helps)
post #10 of 14
Thread Starter 
Quote:
Originally Posted by doyll View Post

Does it heat up as fast with case open as closed?

Airflow could very well be the issue. Too much airflow in the wrong places is sometimes worse then too little

Smooth airflow is very important.. and the faster the fans move air the more important ti becomes because the more turbulence the air can create.

Is your top front fan in front of cooler intake fan?
Air moving too fast across the front of a fan will not flow into fan as well as no airflow in front of fan. (only airflow going into fan helps)


Yeah, I was thinking the same thing. The top is not an intake, although I really don't want to have to turn it around to be one. These fans are much quieter without the intake side impeded and this is eventually going in the living room as an HTPC, so silence at low RPM is key. I could actually be starving the heatsink for air though with this set up, as I'm making it draw air from a slight vacuum.

Quote:
Originally Posted by ohhgourami View Post

Not talking about what you used, but how much you used with what method?[/quote


I was operating under the assumption that I (hopefully) knew what I was doing smile.gif, but I see where you are coming from with this. I've always used the credit card spreader method. I find it gives the best results, especially with HDT style coolers as the gaps between pipes tend to steal all of the precious compound when you're going for final assembly.
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