[TheJayMan]

I think it depends on your ram and graphics card, and a good processor. You're playing a game which uses a lot of resources, then you also want to record which can quite easily double the amount of power and resources needed depending on how you record, with you in HD! I don't know the minimum, but a good process, 3-4GBs of RAM and a decent graphics card, but even some of the best gaming computers will experience lag with recording, it's not always about specs, it can be software..