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I use CCDstack to calibrate images. With about 4gb RAM I used to get memory warnings all the time. I got an upgraded desktop computer about 1.5 years ago. It has 64gb RAM and I don't get the memory warnings.
So its RAM, its SSD versus HDD and its speed of the processor (in my experience ghz speed does not seem super important, perhaps others can chime in there). i7 seems to be a good processor.
This does not have to cost a lot. I recently got a nice 2nd hand laptop with an i7 and SSD plus 16gb ram for $650.
Just be careful with these small external SSD. I have 2 and currently can't find one of them!!! They are pretty small.
Greg.
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