I was wondering if this is enough for gaming? My computer is a few years old, updated graphics card and power supply but i was wondering if anything else needs to be replaced. I don't really lag on games like WoW or League of legends, minecraft etc but when i was on the new DayZ standalone. (which i know isn't done yet so lag is expected but when i was in the city it was hardly playable while my friend who has 8gb of ram had a fps drop but not as bad as me). So yeah I copied speccys summary, thanks for the feedback 
Operating System
MS Windows 7 Home Premium 64-bit SP1
CPU
Intel Core i5 750 @ 2.67GHz 54 °C
Lynnfield 45nm Technology
RAM
4.0GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
Dell Inc. 0C2KJT (CPU 1)
Graphics
DELL ST2010 @ 1600x900
SK-26H640G @ 1360x768
AMD Radeon HD 6800 Series
Hard Drives
977GB Seagate ST31000528AS ATA Device (IDE) 35 °C
Optical Drives
HL-DT-ST DVD+-RW GH50N ATA Device
Audio
AMD High Definition Audio Device

Operating System
MS Windows 7 Home Premium 64-bit SP1
CPU
Intel Core i5 750 @ 2.67GHz 54 °C
Lynnfield 45nm Technology
RAM
4.0GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
Dell Inc. 0C2KJT (CPU 1)
Graphics
DELL ST2010 @ 1600x900
SK-26H640G @ 1360x768
AMD Radeon HD 6800 Series
Hard Drives
977GB Seagate ST31000528AS ATA Device (IDE) 35 °C
Optical Drives
HL-DT-ST DVD+-RW GH50N ATA Device
Audio
AMD High Definition Audio Device
