Very good P4/Socket A heatsink, depending on noise preferences – Joe
SUMMARY: A very good heatsink for P4 or Socket A use.
The good guys at The Heatsink Factory were nice enough to send us a sample of Thermalright’s 947-U. This is the usual all-copper construction we’ve seen from Thermalright; in addition, this unit is designed for both P4 and Socket A use.
The base is a copper baseplate:
I could feel very slight ridges as I dragged my fingernail over it.
The 947-U ships with a bundle of parts:
There are mounts to use Intel’s retention bracket and spring-loaded bolts for bot Socket A and P4 mouting. Fan clips are included for 60, 80 and 92 mm units.
Overall, the build quality is very good.
The Thermalright 947-U was tested on an Acorp 4S845A motherboard with a modified P4 1500 to read CPU case temps; for Socket A, I used the CPU Die Simulator. For testing, I used a Delta FFB0812SHE, 68 cfm @ 4800rpm, 48.5 dBA; this features vanes in the base which straighten airflow into the heatsink. I varied rpms to give a range so users can match performance to noise tolerance.
CPU Case Temp
|Acorp 4S845A, 4840 rpm, 69 dBA²|
|Acorp 4S845A, 3523 rpm, 60 dBA²|
|Acorp 4S845A, 2021 rpm, <50 dBA²|
|4816 rpm, 69 dBA²|
|3512 rpm, 60 dBA²|
|2010 rpm, <50 dBA²|
C/W = Delta / CPU Watts