HP Z820: different heatsinks?

[Gabriel_M]

I want to upgrade my HP z820 v1 CPU from Xeon 2650 v1 (95 watt TDP) to Xeon 2950 v1 (135 watt TDP).

Info gathered so far, thanks to this forum:

• Check the PSU -> Okay, is 1125 watt.
• Check Boot Block -> Okay, is v1 so only v1 Xeon 2600-series CPU
• Check the Heatsink, high performance heatsink needed -> No idea.  😞

In this thread, I found @DGroves typing "your [other OP, not me.] selected 130 watt cpu(s) require the upgraded 3 heatpipe coolers".

Looking at my heatsink (HP part 636164-001), I see 3 pipes on both sides. Also, I cannot find other part numbers for z820 heatsinks. Do I already have the 'high performance heatsink'? Or maybe 'high performance heatsink' is the default in all z820 with a 1125 Watt PSU?

[Edited: layout and typo's.]

[DGroves · Accepted solution]

the z820/z840 due to it's unique cooling baffles can only use the HP made heatsinks,  which is the same for both models

(if you remove the cooling baffling you will get fan errors and bad cooling)

the system determines low/high performance heatsinks installed by the wiring on the heatsinks fan baffle plug which is the same for both type heatsinks

the quickest way to id a high perf heatsink is by the current z840's 4 heatpipes

the original HP z820 130watt 3 heatpipe model is no longer available (it used thicker heatpipes)

CPU/ Server Processor Heatsink 749598-001 782506-001 For HP Z820 Z840 Workstation

https://www.ebay.com/itm/402994338644?_trkparms=ispr%3D1&hash=item5dd4559b54:g:-0kAAOSwVqFg7-If&amda...

https://www.aliexpress.com/item/1005001495077055.html

update: i almost forgot the z840 vapor cooler heatsinks also fit and were a upgraded option used on the z840 in place of the water cooling option used on the z820

https://www.ebay.com/itm/313211563070?epid=4040703665&_trkparms=ispr%3D1&hash=item48ecdd2c3e:g:7c8AA...

to use on the z820 ignore the attached wire, simply secure it out of the way

[Gabriel_M]

Hey, thanks for responding!  So the High Performance Heatsink for the Z820 has 4 (not 3) pipes on both sides.

[Edit: explained by @DGroves: "the original HP z820 130watt 3 heatpipe model is no longer available (it used thicker heatpipes)"]

And I need to look for HP part 749598-00, which fits the Z840 and Z820.

As you wrote "(...) the system determines low/high performance heatsinks (...)", is there also a way to see in BIOS or with diagnostic tools what heatsink is installed?

BTW: love these machines, so versatile and durable.

[DGroves]

no, the bios only reports the fan speed(s) from the cooling baffle  and cpu temp from it's onboard temp sensor

using the low wattage cooler with a 130 watt cpu will cause constant high fan speeds and possible cpu thermal throttling

BTW a v2 motherboard is under 100.00 right now and well worth doing

https://www.ebay.com/itm/373745128098