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01-11-2020 04:15 PM
So, I went ahead and grabbed a couple Z Coolers from eBay. The Z Coolers mounted and fit just fine.
The Z Cooler has a 3-pin fan connector, but of course there is no fan or pump or anything; only pins 1 and 3 were wired (Ground and Sense) and are just screwed into the side of the cooler. However the fan headers on the Z820 (the liquid cooled version anyway,) are 4-pin connections, although the liquid coolers are only wired for the first 3. In order to connect the Z Coolers to the header so at least they'd be grounded, I just took an Xacto knife to the fan connector and cut off one of the guide tabs so I could get it onto pins 1-3 of the motherboard header.
When booting the machine, the BIOS throws an error: "528: CPU requires liquid cooling system" -- however, you can just hit F1 and boot anyway.
Monitoring my CPU temps shows everything is working great. So for ~$200 my Z820 is running very cool and lives to work another day.
06-15-2018 04:44 PM
What are you trying to do, push the performance or lower the noise? The Z coolers use heat pipes and were primarily designed for better acoustics, and you can't order the Z840 with liquid cooling. The mounts for the coolers are located in the same place for the LGA2011 and LGA2011-3 sockets but the fan control algorithms may differ between workstations, especially if they're using different fans.
06-15-2018 06:53 PM - edited 06-18-2018 10:23 AM
the hp z420 and z820 systems were available with a HP optional liquid cooling option,... the system was a AIO based system with each cpu having a water filled radiator/fan in place of the air cooled heatsink/fan going to the intergrated pump/cold plate that mounts on the cpu.
the z620 due to space restraints does not have a factory watercooling option
06-17-2018 09:51 AM
Thanks to all for reply,
I'm aiming to achieve higher steady performance at lower noise levels.
Currently, I do have AIO liquid cooling and found it rather noisy.
Z cooler have bigger cooling capacity and no pump, it should lower the noise.
Fan control algorithms may differ between workstations, but z820 and z840 use the same fans in the air shroud and fan assembly.
Fan control is rather simple: higher CPU temperature results in higher fan RPM.
My concern is will Z cooler fit perfectly in z820?
z800 and z820 had the same distances but the difference was that the space around the socket was populated and interfered with the heat-sink.
06-17-2018 02:00 PM
while the z820 and z840 use diffrent cpu pinouts for the cpu sockets (the z820 uses 2011 v2 and the z840 uses v3 )
the socket mounting hardware may just be the same,.... if it is then yes the heatsinks may fit each other, but due to diffrences in motherboard socket placement the heatsinks if swapped may not allow the fan cooling shroud to seat properly
the z800/z820 heatsinks will NOT swap as the sockets between the two motherboards are diffrent LGA 1366/2011
06-18-2018 04:58 AM - edited 06-18-2018 04:24 PM
From looking at several images of both z820 liquid and the 840 Z Cooler- which have a very similar configuration, the impression is that it the Z cooler will fit physically. The Z cooler appears to be slightly narrower than the z820 liquid cooler.The sure way to know would be to compare dimensioned drawings or to superimpose images in elevation that are resized to match at the socket. So far, it's only possible to estimate, but it seems possible.
It's also an encouraging sign also that there are sellers on Ebay US that list these for both the z820 and z840:
If these are listed to work in a z820 but didn't, there would be a lot of returns /refunds!
The very quiet running is a very attractive idea, although my exerpience with single and dual prcocessor air cooled z620's has been that they are the quietest systems I've had.The z420 liquid cooler is also quiet and reliable.
I'm curious as to how these can be so very efficient without large, direct fans. Have a look at a big dual fan heatsink such as Noctua NH-D15 SSO2.
Again, this is still conjectural, but it seems a promisng possibility.
06-18-2018 09:37 AM - edited 06-18-2018 10:09 AM
Thanks for reply
and an effort to write such a long answer. There are few wrong assumptions/facts presented here and there, but it's 0K.
We don't need to bring z8 in this disscussion, Z cooler was introduced for z840 with intel 160 W processor: Xeon e5-2687W v3. And it was an option for z440.
I'm repeating, z820 and z840 use the same air shroud and fan assembly: 684574-001 .
So, if fits into the same 684574-001 it should be fine for z820, my only worry is if there is enough clearance around the socket not to colide with some of the motherboard elements.
I appretiate all the help that I'm getting, but, to lower signal to noise ratio, please answer in this thread only if you are able to install Z cooler in z820 and have definite answer: it fits/works or not.
Otherwise, we'l get thread that's who knows how many pages long, with most of the posts that don't contribute to finding the answer. Again, I appretiate the argumented discussion and always love to hear other experiences and anegdotes and thanks to all who want to help.
Just to repeat my goal again, I wan't to use Z cooler for performance stability (designed for 160w CPU), lower noise (no pump / moving parts) and, the most important reason, for reliability (no moving parts to break/wear, no leaks).
06-18-2018 10:20 AM - edited 06-18-2018 10:46 AM
BambiBoomZ is correct the z620 does not have a water cooling option (my mistake) i ment to write z420,.. i will correct my previous post
as for the posters request about confirmation that the cpu coolers will swap between the z820/z840
this ebay seller does state that they will fit
the "Z" series cooler uses a vapor chamber /heatpipe design that does not require a pump to move the coolant, and is cooled by the fans in the z820/z840 air shroud