SLK 800 + 92mm fan Doable?

mahkum2 · Post by **mahkum2** » Tue Dec 09, 2003 1:11 pm

I am thinking of installing a 92mm fan on my slk 800. Is this possible? I know Thermalright claims that it can support 80mm fan only. Has anybody in this forum successfully managed to do it? And if yes how? I would deeply appreciate your help.

ABAQUS888 · Post by **ABAQUS888** » Tue Dec 09, 2003 1:37 pm

Several ways:

1. hang a 92mm above it

2. use a chain saw or some sort to flat the top of the 800 A

3. Glue a 92mm on the 800 A

4. use a dremel cut the 92mm a little bit so it can fit into the 800 A

5. the best way is to modify ur fridger to provide cold water to your PC, this will have zero fans in your system, this is the smartest thing to do, dude! refer to my post on this for details.

Post by **Ralf Hutter** » Wed Dec 10, 2003 6:58 am

mahkum2 wrote:I am thinking of installing a 92mm fan on my slk 800. Is this possible? I know Thermalright claims that it can support 80mm fan only. Has anybody in this forum successfully managed to do it? And if yes how? I would deeply appreciate your help.

I've seen pics where people have mounted a 92mm fan diagonally on top of an SLK800 and stretched the mounting wiresw over the diagonal corners of the fan to hold it to the heatsink. It can be done.

(Or you could just modify the ice maker on your fridge with a long chute attached to it so ice cubes would slide down it into your computer, negating the need for any active cooling at all.)

dukla2000 · Post by **dukla2000** » Thu Dec 11, 2003 4:06 am

mahkum2 wrote:Has anybody in this forum successfully managed to do it? And if yes how?

Yup - piece of cake.

- Put the black strips on the highest steps of the heatsink (you probably have an 800a - the highest step is the one that has solid separators).
- Put the 60mm wire mounts in the lowest holes in the 800a (the ones closest to the cpu)
- Put the 92mm fan at 45 degrees to 'normal'.
- Clip the holding wires over the bottom corners of the fan.

al bundy · Post by **al bundy** » Thu Dec 11, 2003 5:24 pm

dukla2000 wrote:
mahkum2 wrote:Has anybody in this forum successfully managed to do it? And if yes how?
Yup - piece of cake.

- Put the black strips on the highest steps of the heatsink (you probably have an 800a - the highest step is the one that has solid separators).
- Put the 60mm wire mounts in the lowest holes in the 800a (the ones closest to the cpu)
- Put the 92mm fan at 45 degrees to 'normal'.
- Clip the holding wires over the bottom corners of the fan.

Very nice solution. Thanks dukla2000!

marc999 · Post by **marc999** » Mon Dec 22, 2003 9:59 am

dukla2000
Thanks for the great suggestion!!

So, have you tested the difference in temps between say a 80mm L1A and a 92mm L1A on the SLK-800A (both at 12V)? I like the idea, but it doesn't neccesarily mean it will cool better. I belive Ralf's latest heatsink review showed the 92mm fan not cooling any better (but this was at the voltage reduced range of around 5 to 7V if I remember correctly). Plus there is the factor that the fan is rotated 45 degress (it may be better, it may be worse for cooling).

spacey · Post by **spacey** » Mon Dec 22, 2003 11:46 am

i believe you can bend the rentension wires a certain way to fit 92mm fans... they're pretty thin, i'm sure you could muscle it

dukla2000 · Post by **dukla2000** » Mon Dec 22, 2003 2:35 pm

marc999 wrote:So, have you tested the difference in temps between say a 80mm L1A and a 92mm L1A on the SLK-800A (both at 12V)? I like the idea, but it doesn't neccesarily mean it will cool better.

I have some test results which support the theory "it doesn't cool better", if you are concerned with CPU temp.

The most comparable numbers are for a 92mm Papst (36cfm @ 12V) and a 80mm NMB (25cfm). At 12V the CPU load temps were 43C and 45C respectively - no big gain. But the mobo temps were 37C and 42C respectively. I think it is fair to conclude much of the extra air spills out the sides. (The MSI KT6 mobo I was testing on has the mobo sensor somewhere right next to the cpu, so it benefits a lot from spilled air.)

I have yet to find the optimum (in quietness) fan setup for this heatsink on an overclocked Athlon that is Folding 24/7

marc999 · Post by **marc999** » Tue Dec 23, 2003 1:36 pm

Interesting. Well I will test too and let you know what I find.

It must be a matter of the 92mm just not hitting the "D" spot (die spot

). If you look at the specs, a 80L1A produces "only" 24 cfm, while a 92L1A does 42 cfm. Surely if that airflow was directed properly, you should see a decent temp reduction. Also, kinda interesting, is the specs on a 92mm M1A. It's rated at 48 cfm, and 30 dba (while the 92L1A is rated at 27 dba, so not much difference in noise, but then again, not much difference in airflow either).

I'm in the same boat as you, trying to OC a chip quietly with a SLK-800A. I have the advantage (I assume) of having just recently installed AccousitPak, so I figure I may be able to get away with a bit more CFM/noise.

Anyway, like I said, I will keep you posted. With the holidays coming, I should have a bit of time to conduct the tests!!

(although I won't have a 92mm M1A on hand, but I think I'll order one for the future).

ColdFlame · Post by **ColdFlame** » Tue Dec 23, 2003 2:28 pm

I wonder whether mounting a 80mm-to-120mm duct on top of the 800U and attaching a 120mm fan to it would yield better results because of no air "spillage'?

Zyzzyx · Post by **Zyzzyx** » Tue Dec 23, 2003 2:36 pm

Ya know, I've got a 92mm Panaflo sitting around, I'll toss up some test numbers as well. My open bench system has an SLK800 with an 6v 80mm L1A right now. With a 1700 TBred it sees low 40s for temps. I'll toss the 92mm on there diagonally at both 5v and 7v and see what numbers I get.

DanceMan · Post by **DanceMan** » Tue Dec 23, 2003 3:43 pm

ColdFlame wrote:I wonder whether mounting a 80mm-to-120mm duct on top of the 800U and attaching a 120mm fan to it would yield better results because of no air "spillage'?

I did tests with an 80mm fan on a 60x60mm HS using a homemade aluminum adapter. The temps with the fan in free air hung above the HS about an inch or two away were only a degee or two higher.
Regarding the 92mm on the ThermalRight, someone posted at Hardware Central that he dropped his cpu temp about 4C by mounting a fan (80mm) flush to one edge of a smaller heatsink, rather than centering it. Since that moves the hub away from the centre of the heatsink, it may mean more actual airflow, particularly for the core.

Zyzzyx · Post by **Zyzzyx** » Tue Dec 23, 2003 3:48 pm

DanceMan wrote: someone posted at Hardware Central that he dropped his cpu temp about 4C by mounting a fan (80mm) flush to one edge of a smaller heatsink, rather than centering it. Since that moves the hub away from the centre of the heatsink, it may mean more actual airflow, particularly for the core.

Hmm... interesting. I can easily give that a shot too.

Zyzzyx · Post by **Zyzzyx** » Tue Dec 23, 2003 7:05 pm

First test result in. This is with a 6v Panaflo L1A 80mm on an SLK800 cooling an AMD 1700 Thoroughbred at stock speed. The system had been stable at 40°C for a couple hours. I moved the fan to be flush with one side of the heatsink, and in five minutes temp rose to 42°C. Been five minutes now at 42°C and no further increase.

Now, if this was an 80cfm Delta Noisemaker, perhaps there would have been a decrease in temperature. Dunno...

Going to bring the temp back down to 40°C now and then mount my 92mm Panaflo diagonally, at 5v.

Zyzzyx · Post by **Zyzzyx** » Tue Dec 23, 2003 7:42 pm

Second test result in.

To make the test a bit more 'even' I set up the 80mm at 5v as well, to see what temp it would do. 1v difference makes a big change, as it settled out at 47°C. Never would have guess that 1v would have made that much difference.

Fan on second round was a Panaflo L1A BX 92mm at 5v, set diagonally on the SLK800. Hub sizes are the same between the two, so the 'dead air' zone in the middle should have the same effect.

Now, the diagonally mounted 92mm at 5v yielded a temp of 41°C, far lower than the 80mm at 5v, but the same as the 80mm at 6v. (there's that small 1v difference again) But, at least with my fans, the 5v 92mm was noticeably louder than the 6v 80mm. More air noise, and lots more clicking.

So, my conclusion? If you want to upgrade to a 92mm fan on the SLK800, its not worth it. Extra noise for added cooling that can be achieved quieter with an 80mm. Spend the money for a Fanmate instead and set the 80mm fan to 6v and enjoy that.

SLK 800 + 92mm fan Doable?

SLK 800 + 92mm fan Doable?

Re: SLK 800 + 92mm fan Doable?

Re: SLK 800 + 92mm fan Doable?

Re: SLK 800 + 92mm fan Doable?