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Active CPU cooling for the Gen8


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Pretty good overall. I'm not a big fan (pun intended) of temps in the 50s and 60s, even if the equipment is rated a fair bit higher, but those temps are after 2 hours of Prime, so I expect everyday temps will be much lower.

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My modification:   With: Intel® Xeon® Processor E3-1240 v2 (8M Cache, 3.40 GHz)    

As I was going to be swapping out the motherboard and fan on my unit, while it's apart I thought I'd take the opportunity to look at other cooling options for the CPU.   This might be of interest to

Last week I finally updated my Gen8 with the E3-1265L "V1" from ebay mentioned in other posts... so  I added a fan to the stock heatsink like other users did:     I had to cut the fan

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Great post & great job on the active cooling!  Did you give it run with the chip all out? (turbo on @ 20 psi!! :)


I love hardware posts with great pix!!  

Edited by FiLiNuX
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Overcoat PM'ed me to ask if I could see what temps my OEM passive cooled E3-1265LV2 shows with CoreTemp that show Tj temps.


For the E3-1265LV2 it shows Tj Max of 94C


Findings posted here in case others interested:



Note:  When I did this test before I found the temps/fan came down after it had been running a while plus this is in my cupboard with door shut (open back cupboard), last time I did the test the front door was open so would have better air-flow than this test so not ideal so estimate ~5C hotter I'd say (Photo here:  http://homeservershow.com/forums/index.php?/topic/5639-proliant-microserver-gen8-links/?p=68867)







Core temps at 0-1% load before PRIME  40/42/42/40 C. ILO4 also showing 40C with ambient of 26C in my cupboard.


On start-up of PRIME temps at 62/68/64/61 C with fan at 31%. iLO4 showing 49C for case temp



Extended Run


CPU running solid on all four cores at 3.08GHz with CoreTemp showing power draw at 41w.



Temps are 82/85/82/82 C stable with fan at 35%. iLO4 showing 60C for case temp.



So at least with the 45w E3-1265LV2 the OEM passive fan can still keep the CPU within its thermal tolerance even without ideal airflow.





The restricted air flow in the cupboard with front door closed with extended running of PRIME flat out is heating up the Ambient to 31C so temps have actually risen to 84/87/83/83 with FAN at 39C and iLO4 showing 61C still. If I needed to run the server at 100% CPU load for extended period I'd relocate or leave the cabinet door open as bit too close to Tj. Max !! Still, the 35w passive cooler is doing well IMO now holding totally steady at ~83C with Max recorded at 87C. iLO4 fan max hit 39% so if I set fan profile to higher it should keep it cooler.

Edited by psikey
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Thanks for posting your results :)


This shows my max core temps with the CPU fan, the screenshot was taken at idle:



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Last update.


PRIME now been running over one hour and temperatures dropped and holding at 78C with fan at 44% so looks like iLO4 is nicely controlling the temp/fan ratio. Ambient now showing at 33C so sure it will run cooler with open front air flow, especially if using a faster fan profile in the BIOS.

Edited by psikey
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  • 1 month later...

I converted the 6 pin fan connector to the conventional 4 pin PWM connectors you get on consumer gear, the Delta case fan now has a female PWM connector where I cut the wires.


In the photo below you can see only the RPM and PWM wires are connected to the mobo. I also left the two connected ground pins intact so it still 'knows' the fan connector is fitted.


I've taken +12V and ground from the SATA wiring harness for the drive bay, negating any risk of drawing excessive current through the mobo.


That first PWM connector is joined to an off the shelf Y adaptor.


The side of the adaptor with all 4 wires goes to the case fan so everything appears stock (i.e. its reported RPM) to the Active Health System.


The side of the adaptor with only 3 wires, excluding RPM, goes to the CPU fan.


As the PWM wire is connected this fan can share the control signal with the case fan, thus it speeds up and slows down in harmony with the case fan :)



Hi there,


at first I would like to thank you for those beautiful photos and nice guide.


I have just bought G8 and gathered all the necessary components and one of them is a Zalman CNPS2X low profile cooler which comes with 4pin standard power connector.


I have tried to understand your guide but I think am lost.


Would you mind drawing me some kind of basic diagram where to put which wire etc?


This seems to be too much for me :(


Thanks a lot for your reply

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  • 2 months later...

As it looks like there's a firmware fix coming for the AHCI fan speed issue, I put my Xeon back in and got some temps with the CPU cooler.






It works a lot better than I was expecting but I'll run the test again once the case fan has been slowed down.

Overcoat, what was your fan speed when you took this temps in ilo? and what OS do you have installed ?

I'm asking for comparing your chipset temps with mine. You have 46C in idle and I have 63 in idle with fan at 6%, Windows 8 as OS. 

Edited by TeoCiontu
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  • 3 weeks later...

Overcoat, what was your fan speed when you took this temps in ilo? and what OS do you have installed ?

I'm asking for comparing your chipset temps with mine. You have 46C in idle and I have 63 in idle with fan at 6%, Windows 8 as OS. 


Pretty sure it was the trial version of Server Essentials 2012. I was running AHCI with 'the fan speed bug', so between 32 and 36%.

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