ParkyTowers has been my favorite place to check detailed info on thinclients.
https://www.parkytowers.me.uk/thin/hp/t610/
https://www.parkytowers.me.uk/thin/hp/t620/

It's a great site, and they give lots of information on the specs and expandabilty of many TCs.

The main difference between the 610 and 620 is the faster CPU on the 620, especially the quad-core variants, and that the 620 lacks a PCI-e port (the "Plus" version has one though)

I'm not sure if the 620's Mini-PCI accepts flash drives either. Many HP thinclients don't have full Mini-PCI slots, and are designed to only be used with wireless adapters.

Thanks for information

Specifically for DosBox, I doubt there’s going to be much difference. DOSBox won’t benefit from the additional cores (if the you were looking at quad core T620) and the GPU performance is likely good enough on both. You might have a small IPC boost from the T620 but pretty negotiable. The real benefit from the T620 would be running things outside the Dosbox environment, were extra cores and gpu performance matter more.

Running some of the great newish indie games that have come out on your TV via a thin client is always a bonus (like La Mulana, or Hollow Knight), or even using it as a Steam Box to connect to a main PC, or even just as a media box.
More power means more freedom, obviously, but also more power and more heat.

Some thin clients can be loaded up with windows 98 natively with matched drivers
I would tend to lean that direction 😉

Too bad there were so few pocket sized UMPC with full physical keyboards

Neoware CA2 is a great example. It even has an ISA/PCI slot.
I own two of them!

Hi, just after posting a message about this machine I’ve found your post about the CA2. I’am having trouble installing the chipset drivers on win98se. It complains about via IDE PCI bus master. Did you installed win98se with success? Which chipset drivers did you use?

Regards