PC Wiring + PSU + GFX

HCSMOKEWEED

New Member
Hey,
Right first off i am having trouble with wiring my power switch to my motherboard , the wires coming from the switch are Black/White so i cant tell which is + an which is - , i know where it goes on the motherboard but will it matter if i put the - on the + and vice versa?

The second thing i need to ask about is , does anyone know of a decent PSU (650w+) fo under £55 ($85 USD)?

And my last thing is , can i crossfire a XFX HD4870 with a Sapphire HD4870 (Same clocks)?

Thanks.
 

My Computer

System One

  • Manufacturer/Model
    Custom
    CPU
    AMD Athlon x4
    Motherboard
    MSI 790FX-GD70
    Graphics Card(s)
    XFX ATI Radeon HD4870 512MB
    Sound Card
    Realtek onboard
    Hard Drives
    1 x 120GB Western digital (IDE)
    Case
    ATX Galaxy 3
    Cooling
    2 x 80mm Fans
    Mouse
    Logitec optical Mouse
    Internet Speed
    Download: 9.85Mbps Upload: 0.45Mbps
*bump*
 

My Computer

System One

  • Manufacturer/Model
    Custom
    CPU
    AMD Athlon x4
    Motherboard
    MSI 790FX-GD70
    Graphics Card(s)
    XFX ATI Radeon HD4870 512MB
    Sound Card
    Realtek onboard
    Hard Drives
    1 x 120GB Western digital (IDE)
    Case
    ATX Galaxy 3
    Cooling
    2 x 80mm Fans
    Mouse
    Logitec optical Mouse
    Internet Speed
    Download: 9.85Mbps Upload: 0.45Mbps
C'mon Guys really need some help here :(
 

My Computer

System One

  • Manufacturer/Model
    Custom
    CPU
    AMD Athlon x4
    Motherboard
    MSI 790FX-GD70
    Graphics Card(s)
    XFX ATI Radeon HD4870 512MB
    Sound Card
    Realtek onboard
    Hard Drives
    1 x 120GB Western digital (IDE)
    Case
    ATX Galaxy 3
    Cooling
    2 x 80mm Fans
    Mouse
    Logitec optical Mouse
    Internet Speed
    Download: 9.85Mbps Upload: 0.45Mbps
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