why i get lag spikes on gtx 650 gddr5 and on my old hd 6670 i dont get lag in bf3

Apr 12, 2014
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so i bought evga gtx 650 gddr5 and tried to play bf3 on auto settings (tried on low ) nothing i was still gettin lags so i decided to do i little experiment i putted my old Radeon hd 6670 2 gb ddr3 and i got on high 30 fps and on auto 54

what the hell is the problem why cant i run bf3 on my gtx 650 like this
can someone explain
my pc
Intel Xeon 3.00 ghz 2 processor
8 gb of ram ddr2
disk 250 gb
psu:750w
win 8.1 64 bit
 

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