Well yes. That's exactly right and kind of the entire point. Just look at any bench chart and it will confirm:
View attachment 354056
They're both AM2 socket chips from the DDR2 era and you'll be hard pressed to find a unit pushing more than 2GB.
They're out there somewhere but the memory kits don't exist and if one stick goes bad, that's it. Literal eWaste.
#1156 and #1406. These are #300 and #50...
From the bottom. Glad I get excellent use of mine on Windows Server.
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OP can get much better use out of the dual core with some XFCE desktop.
I'm sure of this because the linux community finds a way and it's great.
Windows 7 was what shipped with these desktops in their era. I don't like it but I get it.