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04-08-2019 06:12 AM - edited 04-08-2019 06:13 AM
since you have a 56xx series cpu currently, you have a rev 2 motherboard that supports 55xx and 56xx xeon's the original rev 1 board only supports the 55xx series xeons
HP plainly states that the optional 1100 watt power supply is required for the 5680/5690 cpu's
also, although the quickspecs do not state this, HP also requires the watercooling kit for the cpu's as even the upgraded aircooled heatsinks are not rated for this thermal load
the HP z800 has two diffrent air coolers, and one water cooling one
the stock one that's rated for 95 watt or lower cpu's
and the optional one that is rated for 130 watt cpu's
the water cooling option kit is required for the 150 watt cpu's
so to go from a 5650 (95watt cpu) to a 5690 (150 watt cpu) you will need the 1100 watt power supply and the water cooling kit (which is hard to find and very pricy)
my advice, unless you can find two high performance 130 watt coolers and two 130 watt cpu's and the 1100 supply for less than half the cost of a z820, i would spend a bit more and just buy a z820
04-08-2019 07:49 AM
An option is to use the highest rated 95W processor and just swap in two processors and keep the rest the same:
Your current X5650 has a PassMark score of 7396
The X5690 has a score of 8889
The recommended X5675 has a score of 8184. It has a single sSpec code of SLBYL and these can currently be bought used from eBay for about $27.00 USD . I run two of those in my Z600 at home, have added in the Texas Instruments based HP PCIe USB3 card, and run a Kingston Predator M.2 drive as my boot drive and a Samsung enterprise SATA II SSD as my documents drive. This combination is excellent.... I have a Z620 version 2 here also to compare to..... they feel very much alike and your Z800 with the same treatment might be a quick and inexpensive way to go while you save for the future.
04-08-2019 07:53 AM - edited 04-08-2019 08:18 AM
Just saw your comment about water cooling being in your Z800 already. If it is HP then you might be good to go. I don't know if two X5690 processors would work with the lower rated power supply if you are not using up lots of wattage elsewhere. Sounds like you'd be pushing the limits and a used 1110W one off eBay is not cheap (but you could sell your 850W one to recoup some of the cost).
I have a Z400 version 2 at home running one X5690 under the stock 130W Z400 cooler just fine and it is a very nice workstation still. HP never listed the X5690 for this workstation but it works and has worked on every Z400 version 2 I have installed these processors in.
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