well, it always improves graphics + speed(fps) when displayed on higher resolution screense...however, i feel a 1gb Graphics card is not necessary....but projectors' true displays are only 1280X1024 or something...so it doesn't matter even if it's displaying a few hundred inches
but i'm on my laptop and i'll proove it when i get my Thermalright Ultra Extreme next week...when i don't have to run it over 75 Celcius...its dangerous, i put it on 3.2Ghz...but it went till 80C after it finished the Pi calculations....i dont wanna do it again