Gaming pc,Please help?

Hi can anyone tell me if this build would run games like Bf4,Arma and the DayZ mod and all new games ,on high settings or Medium ?will the fps be good with the High settings ?

if you have any suggestions on the build please add it in,as this build i created i made over 6 months ago,thanks

Case:DESKTOP COMPUTER PC CASE Galaxy 3 Mid Tower Black 450W PSU Bubble Light Windows LED

MotherBoard: Gigabyte 970A-DS3P AMD 970 Motherboard (Socket AM3+, DDR3, S-ATA 600, ATX, PCI Express 2.0 x16, USB 3.0)

Intel I5

Memory: Corsair CML8GX3M1A1600C10 Vengeance Low Profile 8GB (1x8GB) DDR3 1600 Mhz CL10 XMP Performance Desktop Memory Module Black

Hard drive:Western Digital 1TB internal Hard Drive - Caviar Blue (3.5 inch) Internal

Power supply: Corsair CX750 Builder Series CX 750W ATX/EPS 80 PLUS Bronze PSU

Graphics card: Gigabyte AMD Radeon HD 7870 Graphics Card (2GB GDDR5, PCI-E)

Windows 7 Pro

Optical Drive:LG ELECTRONICS GH24NS95 LG (24X) DVD Rewriter SuperMulti with M-DISC Support (Internal)

If you have any builds for around the £800 Mark with Monitor keyboard and mouse and future proof/Upgradeable ,please add it in your comment