There were dual-core 32bit processors, but the Pentium D is 64bit.
The motherboard may limit the amount of memory (RAM) that it will take. We'd need to know the make/model of the machine to tell.
Gamers often upgrade their graphics cards to the latest and fastest so you can pick up the not-the lastest at places like CeX. Any competent 13-year old should be able to swap one.
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sj