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See chapter 4, pages 52 & 53 of the service manual for how to install a M.2 SSD:

 

Maintenance and Service Guide HP EliteDesk 800 G3 TWR Business PCHP EliteDesk 880 G3 TWR Business PC

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do you think windows 11 would run well on this pc?

HP Recommended

Absolutely.

 

I have the latest version of W11 installed on my 800 Elite G3 DM PC.

 

If you are interested in installing W11 on your PC as is, you can read this discussion for how I upgraded several HP and Dell notebook and desktop PC's that did not meet the W11 hardware requirements to W11 22H2.

 

You have to use the version of the Rufus utility that I zipped up and attached in the discussion (v3.18).

 

Re: Issues upgrading to windows 11 - HP Support Community - 8517912

 

If the in-place upgrade fails, then you will need to clean install W11 using the bootable W11 installation flash drive you made with Rufus.

 

HP Recommended

also does the 800 g4 tower and 800 g3 tower have the same exact mb and will windows 11 work on 800 g3 twr

HP Recommended

The 800 G4 is fully supported for W11 if it has an Intel 8th generation core processor.

 

No 800 G3's are supported for W11 since they cannot support an Intel 8th generation core processor.

 

You have to install W11 by using a W11 hardware check bypass method which I have already given you.

 

Otherwise, you can remain on W10.

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