92mm on heatsink, high temps!

[velker]

I have an xp 1800 with a HHC001 on it. I took the fan that came with the heatsink off and put a 60-92mm adapter and an enermax 92mm fan on the heatsink. I used to be getting temps in the lower fortieds with arctic silver. Now my temp is around 45 AND i have a 120mm side fan. The 92mm fan is pushed all the way up to its highest speed, some 3000 rpm. Why do I get such high temps? I thought my temp would be in the thirties with these fans. btw, Ive tried switching the 92mm and 120mm around, one blowing in, out, etc. and the lowest temp i can get is still 45. Any answers?

edit: also, the fan that came with the heatsink, a 60mm fan, blowed onto the cpu, my 92mm is now blowing away because I get lower temps that way, but I thought i would get lower temps blowing on because thats how the heatsink is designed.... odd

[mattg2k4]

Have your ambient temps gone up?

Are these bios temps, and if not are you running lots of stuff in windows?

Have you tried putting the old fan back on?

[velker]

its funny, I put back the 80mm adapter and 80mm fan and I get the EXACT SAME TEMP. the 92mm though should be moving twice as much air and it is much louder than the quiet 80mm. That confuses me, thought that 92mm fans are better. My thought is that having an adapter is bad because when i have it to blow into the heatsink the air is bouncing off the adapter. I might try getting a slk800 or something that can support larger fans, maybe that will allow me to use a 92mm with good results.

[Fuze]

adapters aren't always sure fire ways to get proper cooling. Sometimes air will leak out and/or the pressure of the air gets messed up to form improper cooling. The SLK-800 is a good heatsink for larger fans.

However, if your temps are in the forties, my advice to you is.. "If it 'aint broke, don't break it" - Charles Oakley

[Zinedene]

Hi,

I dont tend to use adapters on my builds..
Some 92mm fans will produce more CFM than smaller fans...
Its all down to build quality.

If you are getting the same temps as before, their are a few other factors to consider..

1/ Air Circulation within the actual case..
ie how many fans blowing in/blowing out... how much CFM coming in, and going out...
2/ Some fan adapters dont do a very good job... many will not allow for the full CFM to 'get thru' to the HS.

I would also consider a new HS, if isnt too expensive..

Also, try and duct the side fan directly over the CPU. I have done this and with NO fan on the heatsink, I get temps in the 35-40 range. With the HS fan added aswell, I get ruffly 30's *C
Just a thought!

Good luck

Zinedene

[velker]

thx, the side fan is premade and made over the agp slot area, just under the cpu.. I think I might get a slk800 and put an 80mm fan on it, hopefully ill get lower temps. I have one exhaust fan no intake. Im trying to keep the sound level to a minimum. If I could get the cpu to 40 thatd be great for me as long as its not loud so i cant sleep.

[Cricket]

Hi velker,

One possibility that you aren't getting good temps is that the weight of the adapter and 92mm fan is causing the heatsink (which is pretty heavy by itself) to pull slightly away from the CPU when the case is standing upright. With the adapter adding height to the heatsink stack, there is more leverage to cause the whole assembly to pull against the pressure against the heatsink clip and cause less contact pressure between the heatsink and CPU core.

Maybe you could re-bend the heatsink clip so that it can exert more downward pressure on the heatsink. Or maybe you could utilize the 4 holes around the socket and come up with something that will help hold the heatsink against the CPU with more pressure.

After you work out the heatsink clip pressure problem, you might want to think about installing a skirt around the heatsink fins so the air will be drawn in closer to the base of the heatsink instead of from right under the fan (the Alpha heatsink use a skirt design). This will ensure the hottest part of the heatsink has good air flow to aid in heat removal.

If you're more concerned with having a quiet system, you'll need to reduce the number of fans installed in it.

Cricket