Help with ram problem

I did it helps alot thanks but now it the video card is just to small
 

My Computer

Computer Manufacturer/Model Number
home built
OS
windows 7 64 bit
CPU
i5 750 quad core
Motherboard
boistar tp55
Memory
CORSAIR ddr3 1666 8 gigs
Graphics Card(s)
XFX ATI RADEON 5750
Sound Card
on board
PSU
corsair tx650w
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