After installing Radeon 7770 & Dynex 500w PSU PC is now freezing/crashing during some gameplaying

I am trying to get to the root of why my PC has started crashing after upgrading my GPU and PSU to a Radeon 7770 (Diamond) and Dynex 500w PSU. Game play is great, it's nice and smooth, I can max out the settings no lagging occurs. However even at lower graphic settings certain games will do one of three things,

1.Freeze for a couple seconds with sound continuing to play then it unfreezes and I'm able to play again.

2. Freeze then send me back to desktop with Display driver crash error/

3. Freeze and Blue screen of death with system restart.

My temp ranges on my GPU range from 55c to upwards of 77c

Windows: Microsoft Windows 7 Home Edition, Version 6.1.7601 Service Pack
Memory (RAM): 7919 MB
CPU Info: AMD FX(tm)-6120 Six-Core Processor
CPU Speed: 3489.0 MHz
Sound Card: 1 - TSB-TV (AMD High Definition
Display Adapters: AMD Radeon HD 7700 Series | AMD Radeon HD 7700 Series | AMD Radeon HD 7700 Series | RDPDD Chained DD | RDP Encoder Mirror Driver | RDP Reflector Display Driver
Monitors: 1x; Generic PnP Monitor |
Screen Resolution: 1920 X 1080 - 32 bit
Hard Disks: C: 1844.2GB | D: 18.3GB | Q: 0.0MB
Hard Disks - Free: C: 1483.7GB | D: 2.3GB | Q: 0.0MB
Manufacturer: AMI
Product Make: h8-1212
AC Power Status: OnLine
BIOS Info: | |
Motherboard: Gigabyte 2AC8

I have had advice kind of range from defective card to cheap PSU and was hoping with more detail someone could really narrow down a solution. Thank you for your time.

EDIT : I wanted to add this also its the MSI afterburner results I have no idea how to read this properly maybe there is something in there that can help determine what is causing the crashes

Score: X903 (21 FPS)
Submitted (anonymous mode) on November 27 2013, 1:13 am

API 3D: OpenGL 4

Graphics score: 1456 points (24 FPS)
PhysX score: 748 points (37 FPS, CPU PhysX)
Combined score: 506 points (10 FPS)

Duration: 130000 ms
Resolution: 1920 x 1080
Anti-aliasing: X0
Window mode: fullscreen

Primary renderer: AMD Radeon HD 7700 Series
OpenGL version: 4.2.12430 Compatibility Profile Context
Graphics drivers: - Catalyst 13.9 10-8-2013

Number of GPUs: 1
GPU 0 - AMD Radeon HD series (1002-683d) - GPU clock: 1075 MHz - Mem clock: 1200 MHz - Max GPU temp: 63 °C - Max GPU load: 99 %

CPU: AMD FXtm-6120 Six-Core Processor
CPU speed: 3491 MHz
Operating System: Windows 7 64-bit build 7601 Service Pack 1
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