The EEPC should be fine for what you want.
I use an old desktop in my observatory. I forget how big the processor is but it predates any sort of dual technology.
It has ~700meg ram and a small video card and more importantly has serial ports.
It runs Skymap pro, EQMOD, guidemaster, CCDSoft, Elbrus(plate solving software) all at once with no problems.
I just put all the files onto a flash drive at the end of the night and process them on my normal desktop.
The puter at the telescope just needs to be rugged, dew tolerant and cheap. Not high power.
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