Obviously he means DDR3@ 1333mhz.
5450 is an extremely low end card. I wouldn't recommend anything less than a 5770 for gaming.
However you failed to mention what resolution your monitor is, which is the most important factor.
Yeah I do mean 1333MHz, I just got lazy and copied my rig off speccy lol.
Yeah it is really bad for frame rates, good at generic stuff like internet browsing etc for a cheap card.
My res is 1440x900, but i dont mind gaming at 1280x800.