gtx 650, 650 ti boost or 660

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Dec 22, 2013
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My gpu is out of date and need to replace a good gpu for high res. which gpu is good for my system or should i rebuild my system?

Here is my system
Processor / core 2 duo E7500@2.93ghz
MOBO / ga-g31m-es2l
RAM / 2 * ddr2 ram run at 800mhz
PSU / 400 watt
 

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Dec 22, 2013
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Thx for answer my question. There is one more question, can i buy a low graphic card like 640 or lower to replace? because my graphic card is near end of the life.
 
At stock levels I wouldn't get anything above a 7770 to be frank, a 650 Ti Boost will be performing to nearly half its potential with a stock E7500 so you'd notice no real difference between the 7770 and the more expensive 650 Ti Boost with your current setup

If you want decent performance at a high resolution (such as 1080p etc.) you'd want to pick up a decent CPU like the FX-6300 (with a good cooler such as the CM Hyper 212 EVO/Xigmatek GAIA), a decent 970 or 990FX motherboard with an 8GB kit of DDR3-1600 RAM as well as a decent GPU like the r9 270/x
 

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Dec 22, 2013
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In my local store price 7770 same with 650ti and between 650ti boost are only 20-30 dollar. I still don't want change my whole system until i save up some money and because the graphic card on my rig are near end of life. There is why i change my graphic card 1st.
Anyway, thx for your suggestion.