system is 10 degrees Celcius hotter with better fan! UPDATE :)

[FrontlineWarrior]

Ok here is the deal:

Replaced Delta AFB0612HA 60mm fan rated at 21.2 cfm (this is the stock fan for the Taisol 760092)
Put in Panaflo FBA08A12L 80mm fan rated at 24 cfm.

I used to get CPU temps of 34 at idle and 40 at load.
Now I get CPU temps of 43 idle and untested at load.

WTF?

I didn't use an adapter for the 80mm on my Taisol... I just sort of put it on top of the heatsink with a few rubberbands.

Does anyone think that the rise in temps might be due to me dislodging the heatsink a little while I was replacing the fans? I did wiggle it a little, but seeing how it's still clamped on, I don't think it moved... is it possible for it to move even with the clamp on?

Update: I put the fan on slightly off-center so I can have more surface area of the heatsink exposed to the air flow of the fan. (when putting the fan on completely on top of the fan, a large part of the heatsink did not get airflow because the center of the fan was too big.) Now my temps are 37-38 degrees on idle, which is a hell of a lot better than 43.

 

[Huma]

some of it's probably due to the 60mm directing airflow where it's needed better.

a low speed panaflo doesn't push air very quickly, and some heatsinks don't deal well with this. If you can direct airflow better, it could help, but it still might not match your old fan.

 

[Jerboy]

<< Ok here is the deal:

Replaced Delta AFB0612HA 60mm fan rated at 21.2 cfm (this is the stock fan for the Taisol 760092)
Put in Panaflo FBA08A12L 80mm fan rated at 24 cfm.

I used to get CPU temps of 34 at idle and 40 at load.
Now I get CPU temps of 43 idle and untested at load.

WTF?

I didn't use an adapter for the 80mm on my Taisol... I just sort of put it on top of the heatsink with a few rubberbands.

Does anyone think that the rise in temps might be due to me dislodging the heatsink a little while I was replacing the fans? I did wiggle it a little, but seeing how it's still clamped on, I don't think it moved... is it possible for it to move even with the clamp on? >>



Two reasons:

the fan doesn't effectively blows air into heatsink when you have half the effective area exposed outside heatsink.

Second:

You've just been fooled by the "cfm" marketing. CFM ratings simply tells you how much air it can move in free air such as when you hang it from a fishing rod into air.

Those 60mm Delta screamers are high speed fan and performs better under load(resistance). In general static pressure is a fuction of fan blade velocity.

 

[FrontlineWarrior]

Jerboy,

Actually, the 80mm fan fits pretty well over the heatsink. I placed it pretty much over the center. One thing that I think might be happening is that the circle area in the center of the fan is a little bigger on the 80mm, so it's not getting as much air to the center of my heatsink as the 60mm Delta. Maybe I'll try to attach the fan a little off center and see how it goes... (the sides are definitely cool to the touch)

 

[FrontlineWarrior]

ummm now i'm having trouble booting up like half the time... this is annoying

 

[Insidious]

I don't know how you are measuring CPU temp, but if it is a backside temperature, don't forget how the air moves around the ZIF socket will affect your "CPU" temperature significantly.

If you are removing more heat from your CPU with this fan, and your case is not well ventilated, your system temp will rise accordingly, and CPU temp with it

You may have accidentally trapped an air bubble between your HS and your CPU (nice thermal compound toutorial here

You may be cursed J/k

(These are the only ideas I can come up with that weren't already mentioned above)

 

[FrontlineWarrior]

thanks insindious, that will give me a few leads to investigate on