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The parts that differ between two machines at similar money are rarely the ones printed largest. Graphics tier is the obvious one, and it should be, but the drive size, the number of memory modules, the board's expansion slots and the amount of air the case can actually move separate two otherwise identical listings in daily use. A specification that looks generous on graphics and thin everywhere else is a machine you will be opening up within the year.
The other habit worth forming is to buy for the display you own or intend to buy. A panel is the one component that outlives several machines, and the resolution and refresh rate on it decide whether an upgrade inside this bracket is felt or merely measured.