The GX620 should support Windows 7 64 Bit but the maximum RAM is 4 GB so theres little advantage. Most GX620s don't support Windows 8.1 or 10 64 Bit due to elevated processor requirements.
Look for a second hand OptiPlex 760 or 780 with a Dell Windows 7 professional OEM license, it may be cheaper or comparable to the cost of buying a new license for that model and they perform significantly better.
Philip_Yip
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Posted January 20th, 2015 13:00
The GX620 should support Windows 7 64 Bit but the maximum RAM is 4 GB so theres little advantage. Most GX620s don't support Windows 8.1 or 10 64 Bit due to elevated processor requirements.
Look for a second hand OptiPlex 760 or 780 with a Dell Windows 7 professional OEM license, it may be cheaper or comparable to the cost of buying a new license for that model and they perform significantly better.
Windows 11 Installation Guide
Windows 7 Installation Guide