the diagram on the instructions of an AlphaPAL6035 installation seem to show that the fan should suck air away from the cpu. Is this correct? I always thought you wanted the fan blowing onto the cpu? or does it matter?
should fan blow onto the cpu or suck air out?
- Thread starter Ph33zy
- Start date
i don't know too. But usually Fan always blowing into the cpu. If suck air, the power isn't quite enought to cool the cpu.
<< the power isn't quite enought to cool the cpu. >>
Yep ,I think the fan has to blow on the cpu,unless it comes with a heatsink that is designed for the fan to suck air away from it.
Yes, the Alpha instructions are correct. The fan should move air away from the cpu.
Check out 2CoolTek's heatsink comparison test. Take particular note of how the Alpha PFH cools better with the fan drawing the air from the heatsink.
Check out 2CoolTek's heatsink comparison test. Take particular note of how the Alpha PFH cools better with the fan drawing the air from the heatsink.
for alpha sucking out from the heatsink is better cooling...... i tried to change the direction of the fans by blowing into the cpu and the max temperature rise 2 degree... is really depends on your air flow in your case.For me example, if i let the fan suck air out from cpu, my system temp will rise about 3 degree...but my system temp will decrease if i put the fan blowing on the cpu.That means by blowing on the cpu, my case airflow is better .... that is only in my case....so i think you bettter do some experiment. 
I've never heard of a CPU being WARMER when sucking air than blowing, but I imagine if you didn't use thermal paste and the heat transfer was not as good, then the heatsink couldn't dissipate heat fast enough. Under almost all circumstances, you should have air being taken OFF of the heatsink.
dm
dm
If the surrounding air is much cooler than the CPU temp, you would want the fan to blow the CPU.
If you live in the SE Asia, you'd want the CPU to suck the hot air.
If you live in Alaska, you'd want the fan to blow the cold air to the CPU.
Hope this helps.
HSF performance should be evaluated based on the difference of temperature or approach between the CPU and the case temperature. CPU's temperature doesn't mean much if the ambient temperature (or case)varies during the test. AMD's guideline puts it correctly by saying this difference should be about 7 C max for their CPUs. Less than that and you've got a good HSF. I'm quite surprised that most published benchmarks all refer to the CPU's temperature but not the approach to case temperature. As a general rule and thermodynamically speaking, the fan should blow to the sink but not the other way around: air flow thru the fan is inversely proportional to the absolute intake temperature so it will have the highest flow. Sucking flow would have 2 drawbacks: air intake is warmer since it is heated up by the CPU's heat hence less flow thru the fan, and suction pressure drop is quite detrimental to the the fan output.
anyone else have anything to add? Especially owners of alpha pal6035's? Also im running a P3 933@1050 and my temperature is 35 degrees celcius idle. Im also using artic silver and my alpha fan is "sucking". This seems a little high for using artic silver and an alpha fan...im not really sure so just making sure thanks guys
What is your MB temp?
What motherboard are you using?
Your temps are not that warm for the average case temp.
Mike
What motherboard are you using?
Your temps are not that warm for the average case temp.
Mike
im using an ASUS cusl2-c. my case temp right now is 32 C and my cpu temp is 35 C when just surfing the web. This is my first time o/c'n so im not sure if those are good temps. Im running a P3 933@1050 using 1.7V
I have two blow holes blowing onto my mobo so if I had my 6035 sucking air it would be blowing aair right into my two 80mmfans that are blowing air, so it works better for me if it is blowing.
ayh renob is same as my situation...blowing is better for us ...for you i tihnk is ssucking ..since you dont have fans at the side of your case
actually i do...well not yet...i am expecting it any time soon though. Its the . Ultra Theonso with this case..i should have it blowing in... ill try different things when i get it. Right now..im using my old case with everyhting opened cuz the alpha fan wont fit into my old case. ill expereiment with it when ill get my case. thanks for the replies
ONTO THE CPU...
REASON...
Air is "much" Denser when compressed and conducts heat better, hense when you are forcing it on the CPU, therefore Cooling much better... like sticking your finger in Front of a fan vs. behind it (try it)..
Air on the back side of a fan is actually less dense than static air and can't draw out heat as well...
Systems you see with a "draw air away from the CPU" configuration are simply designed that way to draw air out of the case... If you have a well ventalated case then you don't need to draw the CPU air out the case.
REASON...
Air is "much" Denser when compressed and conducts heat better, hense when you are forcing it on the CPU, therefore Cooling much better... like sticking your finger in Front of a fan vs. behind it (try it)..
Air on the back side of a fan is actually less dense than static air and can't draw out heat as well...
Systems you see with a "draw air away from the CPU" configuration are simply designed that way to draw air out of the case... If you have a well ventalated case then you don't need to draw the CPU air out the case.
ph33zy,
your temps are fine. YOu may want to work on case cooling a bit.
Whitedog,
You forget that alpha's are designed to "suck" air. They include the airflow shroud for a reason.
Mike
your temps are fine. YOu may want to work on case cooling a bit.
Whitedog,
You forget that alpha's are designed to "suck" air. They include the airflow shroud for a reason.
Mike
Well my power supply fan sucks air and since my CPU fan is right next to it, I make it suck also to keep the flow of air in one direction.
It takes more fan power to suck than to blow...upwards of 5 times as much to acheive the same flow while sucking ( or drawing air ).
It is best to cool the ambient case tempature down as low as possible and then to blow the cooler case air onto the component.
I was an engineer for Purolator air filter division for over 13 years
We developed air cool options for some serious computer applications at Motorola..etc..
It is best to cool the ambient case tempature down as low as possible and then to blow the cooler case air onto the component.
I was an engineer for Purolator air filter division for over 13 years
We developed air cool options for some serious computer applications at Motorola..etc..
<< Systems you see with a "draw air away from the CPU" configuration are simply designed that way to draw air out of the case... If you have a well ventalated case then you don't need to draw the CPU air out the case. >>
I would have to agree with whitedog.
Just out of curiousity, if it is indeed less efficient to suck air than to blow, why does Alpha recommend that the fan suck? Alphas appear to be designed this way. The Hedgehog is either/or -- just remove the shroud if blowing in -- but if it is SOOO much better to blow, why do so many manufacturers recommend sucking?
actually you should try it both ways and monitor the differance....phamcomputer.com did tests and decided that the fan pulling air into the heatsink/cpu performed better....so try it each way and see for yourself
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