System slow

the ram isnt matched i bought it matched but it is not they are a little diffrent can i lossen the timmings to comp for this
 

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
Fixed finally

After several weeks of phone calls and new mobo, cpu and, ram it was in fact the video card that was the problem. thanks again for all those that help me with this
 

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
Thank you for posting back. Glad you got it sorted out.
 

My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 Professional x64
CPU
Intel i7 2600K OC'd @ 4620 MHz
Motherboard
Asus P8Z68-V Pro
Memory
16GB GSkill Sniper 2133 Mhz (4x4GB)
Graphics Card(s)
EVGA GeForce GTX 480 SuperClocked+
Sound Card
Realtek High Definition Audio
Monitor(s) Displays
2x Acer S273HLbmii 27"
Screen Resolution
2 x 1920x1080
Hard Drives
64GB Crucial M4 SSD

Storage: Hitachi 1TB 5400RPM, Samsung 1.5TB 5400RPM
PSU
Corsair HW Series 750w (modular)
Case
Cooler Master HAF 932 Advanced Blue Edition
Cooling
CM Hyper 212+ CPU cooler, 3x 230mm + 1x 140mm case fans
Keyboard
Logitech MK320 (wireless)
Mouse
Logitech MK320 (wireless)
Internet Speed
30 Mb/s : 2 Mb/s
Thanks for all the help I should not have any problems with the new graphics card for a while xfx radeon 5750
 

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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