Liquid cooling on HP Z800: two independent liquid cooling systems on the bi-processor (Xeon X5690)?

[Tijead]

Hi, I have salvaged a HP Z800 workstation at work.

It is nice because I switched the old CPUs and replaced them with two Xeons X5690, each with 6 physical cores, which are useful for my simulations (my simulation are single-CPU bound, so I can now launch 2*6*2(multithreading)=24 jobs at the same time, instead of 2*4*2=16 previously).

However, when I boot up the workstation, I have a BIOS low-power heatsink error that appears. I can ignore it by pressing F1 and the system boots up (Ubuntu 22.04.1 LTS Budgie version 10.6.1, not that this is particularly relevant I guess), but I am afraid that if I launch a computation on each of all the cores I have available, the factory-install heat-sink will not suffice, and I don't want to break anything nor to throttle the CPUs thermally...

The liquid-cooling system provided by HP for this workstation (one heatsink with two liquid systems CPU sockets) is hard to find nowadays and is either not available in France, or very expensive.

So I was wondering, can I install two independent single-fan (for the sake of room availability, could be more) liquid-cooling systems? Would it be plug-and-play as long as I choose the right (lga1366) socket?

Would anyone have an example of a system model I could order and set up in my Z800 workstation?

Thank you all for your advice and this neat forum.
Cheers!

[BeemerBiker]

l believe you need the fan that has the jumper to identify it as a high performance fan

https://www.ebay.com/itm/333978725780

On my z400 I just used a jumper from that 5th pin to ground and used an eVga liquid cooler that had 4 pins

[Tijead]

Thank for your message and feedback. So you think I can basically take any single fan liquid cooler, put it on each CPU and use a jumper from 5th pin to ground and then the cooling system will just adjust the cooling power by itself? Nothing else to do?

In any case, would it be dangerous (for the hardware to use the factory heat sinks I currently have and use a jumper from 5th pin to ground so that the system believe it is a high power heatsink?

Thanks for your advice!

[BeemerBiker · Accepted solution]

The high performance fan (the url above)  would replace the fan on the factory heat sink.

More details here

https://h30434.www3.hp.com/t5/Desktops-Archive-Read-Only/Will-HPZ800-take-Intel-Xeon-X5690-CPU/td-p/...

My z400 had only one CPU and I suspect there might be a lack of space for a second radiator on your z800

Your 5690 runs much hotter than my 5675 and I suspect you need to get the premium heat sink. You might compare you current heat sink to the ones identified by the part number 535586-001 above and if they look the same then put in the premium fan.

The radiator for my single x5675 is 240mm with pair of 120 mm fans.  I suspect your pair of 5690 to need a way lot more cooling.  I also had to upgrade to an ATX case. 

[edit] A discussion similar to this is here and @DGroves and @SDH are more familiar with the z800 than i.

Pimping my open frame dual x5675 system  https://stateson.net/images/dual-x5675.jpg

[DGroves]

the z8xx series workstations used custom heatsinks that fit within the custom cooling shroud that besides providing proper airflow for the heatsink cpu's also directed airflow to various parts of the motherboard

while it's possible to remove the air shroud and install aftermarket heatsinks, this will not properly cool the motherboard

so unless you are able to add the necessary motherboard cooling going this route is not recommended

the Hyper 212 evo(s) (w/mounting kit(s)) will fit but you will also need to cool around the base of the cpu's and by the  top right of the motherboard and several other places look at the cooling shroud and you should be able to determine the necessary locations

i personally would source the z800 performance heatsinks and install the next lower cpu which is a 130 watt instead of the 150 watt ones you now have

https://h20331.www2.hp.com/Hpsub/downloads/Mini_WP_Z800_memory.pdf