Sir I have intel i3 2120 processor. What graphics card and its compatible motherboard should I choose without bottlenecking &

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Solution
For the motherboard, I would say a GA-B75M-D3H:

http://www.amazon.com/Gigabyte-Intel-Micro-Motherboards-GA-B75M-D3H/dp/B007R9CRGW/ref=sr_1_1?ie=UTF8&qid=1433872914&sr=8-1&keywords=LGA+1155+motherboard

And for the graphics cards I have two options for you. Please note that bottle necking is a more opinion-based guess and cannot be a perfect science until it is tested. However, in my opinion, your cpu shouldn't bottleneck these two:

R9 280:

http://www.amazon.com/gp/product/B00IZXOW80/ref=s9_simh_gw_p147_d0_i2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=desktop-1&pf_rd_r=101ZEBJNS91QWNVSZPKP&pf_rd_t=36701&pf_rd_p=2079475242&pf_rd_i=desktop

GTX 960...


if you already have a i3 2120, then the same motherboard you have can be upgraded to the i5 2400, i5 2500, or i7 2600. As well as the "k" variants.


Which are all better then the 8350.


The i7 2600 is still very powerful.


You should also have the proper ddr3 ram, just make sure to get 8gb total.


All you need is a good 500w power supply.


Choose from this list, tier 1 or 2 unit in 500w or better:

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
 


Agreed