Hey, I'm younger than GK and I played N64 as a kid in the supermarket (even though it was the year it was discontinued). And got one years later for my retro colelction.
N64 emulation is very easy and not demanding (my ancient toaster from 2004 could do it), PSX isn't either but it requires more preparation due to BIOS and all.
Gamecube on the other hand, a whole nother level. More developed than PS2 emulation, but still hefty for the PC. His computer's gonna explode.
And GK knows jack shit about computers apparently. When he was asked about what RAM he has, he said something like "DDDR 20".