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Looking for a heatsink compatible with xw8400

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Looking to upgrade my old xw8400. I already got two intel Xeon x5365 processors and successfully installed them. My machine now quickly overtemps and shuts down. I've got two 398293-003 heatsinks at this moment.


The processors have a TDP of 150W.


Anyone have experience with this or can think of compatible heatsinks?


They're supposed to fit an LGA771 J socket and be strong enough to cool xeon x5365 processors.


Thanks a lot in advance!

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the early mac pro (circa 2008) heatsinks can be adapted you will need to install two fans on each heatsink following the xw8400 5 pin fan connector pin out (look in the xw 8400 service manual for pinout)  and connect the wires from each fan together (except for the tach lines) only one fan's tach line will be used per heatsink leave the second fans tach line unconnected


Genuine APPLE OEM Mac Pro A1186 Early 2008 CPU Pair Heatsink Kit 593-0635


the xw8400 uses a standard 4 pin pwm connector with a jumper wire that connects each end pin together this crossover wire is what tells the board the high performance heatsink is installed


as i recall, the xw8600 dbltall heatsink will also work on the xw8400

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I have a pair of heat sink and fans from my XW8200.



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My recollection is that the heatsink/fan combo for the 8200 series is not cross compatible for the xw6400/xw8400/xw6600/xw8600 workstations.  All the heatsink/fans for the last 4 are cross compatible assuming the case is wide enough.  You can't fit the double tall double fans one into the narrower xw6400/xw6600 cases.


The wiring of the fans is such that the motherboard can tell if a double tall double fans "Performance" heatsink is present and will not boot if you have a high enough wattage processor(s) present and not have the higher cooling capacity heatsink installed.  HP uses the terms Mainstream and Performance heatsinks to differentiate the cooling capacities.


DGroves found you a very good price on those.  They are rare and have been very expensive.  

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