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Computer is very slow after putting in graphic card

Last response: in Graphics & Displays
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April 10, 2012 10:13:37 PM

Hello,
my computer becomes very slow when I try to install nvidia geforce gtx 550 ti graphic card. when I switch back to onboard card everthing is ok... and then when I try to install again it's the same problem I scanned with Avast antivirus and found no virus,I reinstalled my windows but still didn't fix the problem, I updated the drivers but computer is still very slow..and my cpu is always at 100% when there is no programs running..

I have psu 550w, AMD Athlon(tm) Processor 3200 2.00ghz and 3gb ram
a b Î Nvidia
a c 175 U Graphics card
April 11, 2012 6:00:43 AM

A bottleneck I guess...
a b U Graphics card
April 11, 2012 7:10:52 AM

ya im guessing your processor just isnt up to snuff.

i had a similar experience putting a gtx 285 on a processor like yours.
!