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Power/speed is determined by memory, graphics
memory, processor, hard drive speed, as the 4 most critical
items.
Windows 7 computers should have at least 4 Gb of memory
(this is max for 32 Bit Windows while I recommend 64 Bit
Windows 7 which can have higher memory for future upgrades
or initial purchase);
Graphics memory should be at least 512mb;
Processor should be at least dual core and 2.0GHz minimum
speed for dual core;
Desktop hard drives should be at least 7200 rpm and laptops
5400 rpm. Drives should also be a minimum SATA 3.0.
Because today's software takes more space, 500Gb is
the minimum hard drive I recommend. Hard drives for desktops
are relatively inexpensive, and because of that, 1Tb is my
drive of choice (2x 500Gb). I actually prefer a 500Gb drive
for programs and then a separate 500Gb or 1Tb for data. This
link explains my reasoning (and goes even further with a 3rd
backup drive if you have critical data to protect).
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