Modular Combat System Will This Computer I'm About To Buy Be Good Enough?

Will this computer I'm about to buy be good enough? - modular combat system

My uncle bought a few pieces that I use to build a PC. They are:

Motherboard:
http://www.scan.co.uk/Products/ASUS-P5P43TD-PRO-Intel-P43-S-775-PCI-E-% 28x16% 29-DDR3-1600% 28% C 29-1333-1066 -- SATA II RAID ATX

Processor:
http://www.scan.co.uk/Products/Intel-Core-2-Duo-E8400-Wolfdale-Core-S775-30-GHz-1333MHz-6MB-Cache-9x-Multiplier-Retail

Graphics:
http://www.scan.co.uk/Products/1GB-Sapphire-HD4850-PCI-E-20% 28x16% 29-1986MHz, GDDR3, GPU 625MHz, 800 Cores, 2x DL DVI-I - HDTV HDCP

HHD:
http://www.scan.co.uk/Products/500-GB-Western-Digital-WD5000AAKB-Caviar-Blue-IDE-%% 28PATA 29-7200-RPM 16MB Cache-89-EM

PSU:
http://www.scan.co.uk/Products/620W-Coolermaster-Real-Power-M620-Modular-PSU-SLi-PCI-E-SATA-80pLU-EFF-ATX-12V-V23-EPS-12V-V291

RAM:
http://www.scan.co.uk/Products/6GB-%% 283x2GB 29 CorsairXMS3 DDR3 PC3-10666-% 281,333% 29-240-Pin, Non-ECC Unbuffered, CAS 9-9 - 9 -- 24

In going to this computer for all school work, media and arms combat FPS game easy to use. These are the details of this PC good enough?

Thank you in advance.