Black screen with AMD R7 200 Series

I've done everthing on this website and I still can't get this game to work. After 4-5 minutes the game goes black, the music is still rolling but I can't do anything. This is my computer spec's.

I'm suspecting it's the PSU that is only 350W.
I have a spare 450W PSU but I'm not sure if it will do the trick.

SPECS:
Spoiler
Processor

AMD® FX-8300 Eight Core Processor @ 3.30 GHz

Operating
System

Windows 8 64 Bit

Chipset

AMD 970

Memory

16GB Dual Channel DDR3 at 1600MHz, 4 x DIMMs

Graphic

AMD® Radeon HD8570 2GB

Storage

2TB HDD 7200RPM

Optical Drive

Super-Multi DVD

Card Reader

16-in-1 Card Reader (CF/Micro Drive/MS/MS Duo/MS Pro/MS Pro Duo/SD/MMC/MMC4.0/RS-MMC/RS-MMC4.0/SDHC/MS Micro-M2/Mini SD/Micro SD/Mini MMC)

SATA

5 x SATA 6GB/s

Expansion
Slots

2 x PCI-e x 1
1 x PCI-e x 4
1 x PCI-e x 16

Front I/O
Ports

1 x Headphone
1 x Microphone
2 x USB 2.0
2 x USB 3.0
1 x 16-in-1 Card Reader

Back I/O
Ports

2 x USB 3.0
4 x USB 2.0
1 x Display Port 1.2
1 x HDMI
1 x VGA
1 x PS/2 (Keyboard/Mouse)
1 x RJ45 LAN
1 x 8 Channel Audio
1 x Optical S/PDIF Out

Audio

High Definition 8 Channel Audio
SonicMaster

Power Supply

350 W Peak

Dimensions

175 x 420 x 400 mm (WxHxD)
242 x 510 x 550 mm (WxHxD) with Carton

Weight

9.2 kg


What I've done:

Removed CCC, used CCleaner to remove all.
Re-installed CC 13.12 Driver but every time I install, The Catalyst version is 14.12 :( I don't know how to put it to 13.12 like other people have stated before (resolved their problems) http://www.tomshardware.com/answers/id-2456688/amd-radeon-200-series-driver-updated-screen-resolution-messed.html
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