I have a 64-bit Windows 7 Home Premium PC with a Gigabyte G41M-combo motherboard with 8gb memory, a dual-core E6800 3.33 GHz CPU, 585 PSU and an Nvidia Quadro FX 1400 graphics card......im not a big-time gamer but im looking to play some games on this PC and im wondering if the graphics card i have is ample enough or should i splurge and upgrade to another card??