This post is to share experiences of using Windows 10 on a Dell Optiplex GX620 desktop.
My desktop originally came loaded with Windows XP running on its standard hardware.
Over a period of time I had upgraded its processor to Intel Pentium D 3.40 Ghz (a 64 bit processor) and its RAM to 4GB. I also had purchased a copy of Windows 7 and installed it on my desktop. Windows 7 was working superbly on this upgraded configuration for meeting my day to day computing needs.
With the arrival of Windows 10, as I had kept my Windows 7 updated, I received an option to update to Windows 10. The update tool reported that my desktop hardware was compliant with Windows 10. Though I was feeling a bit skeptical about whether my desktop will be able to run with it, I decided to bite the bullet and am already feeling glad to have done it. :)
Windows 10 is now running pretty efficiently on my Dell Optiplex GX620 (upgraded hardware). But it is too soon to be very happy I guess. There are no problems with any drivers as yet and I am keeping my hopes high :)
Others may feel free to share their experience about this particular model running on Windows 10.