Would this fan work?


666sheep

macrumors 68040
Dec 7, 2009
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Poland
It will work. But from the pics it's clearly 3 pin 3 wire fan. Just use 2 of them with standard MDD 2 pin connector.
One question: are you sure that your 1.25 DP has stock 120 mm fan?
IIRC 108 CFM one (Papst) was used in SP and lower clocked DP (867 and maybe 1.0 - not sure here). 1.25 DP should have 149 CFM Delta AFB1212VHE or SHE. All my 1.42 DPs have SHE IIRC.
 

MisterKeeks

macrumors 68000
Original poster
Nov 15, 2012
1,832
25
It will work. But from the pics it's clearly 3 pin 3 wire fan. Just use 2 of them with standard MDD 2 pin connector.
One question: are you sure that your 1.25 DP has stock 120 mm fan?
IIRC 108 CFM one (Papst) was used in SP and lower clocked DP (867 and maybe 1.0 - not sure here). 1.25 DP should have 149 CFM Delta AFB1212VHE or SHE. All my 1.42 DPs have SHE IIRC.
108 was the number I pulled from this page. Mine never had a system fan. Do you think that the CFM is high enough?
 

666sheep

macrumors 68040
Dec 7, 2009
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Poland
On japamac's site parameters are more general than specific. Few dozens MDDs passed through my hands, and I can say with certainty that they had different main fans, depending on CPU speed and count. IIRC 1.25 DP should have about 150 CFM fan.
I'd say 92 CFM won't be enough for 1.25 DP on full load, especially if it's 2MB L3 one. NAP helps, but mostly when idle.
On the other hand, fans are software controlled, unlike in previous PMs. There is a kext in OS X with fan speed values corresponding to CPU thermal sensor reads. You can edit this kext according to new thermal management.
 

666sheep

macrumors 68040
Dec 7, 2009
3,623
211
Poland
It reads thermal sensor on CPU daughtercard. It's small 5-leg, rectangle chip placed between cache chips on CPUs side. On 1.42 DP card I have in the hand now it's marked U18 (on PCB).