Yogart

could anyone help with my setup please? [h=2]Lenovo g580 i5 3210, 6gb ddr, hd4000[/h]

Hi guys , i am a bit of a newbie on this egpu and i do not want to go and buy the wrong parts lol , so i was just wondering if someone can help me for choosing the parts available for my laptop this is the spec: Lenovo g580 i5 , 6gb ram , mpcie i think but i do not know what speed it runs at so thats why i am lost so i do not know what parts to get.. which gfx is best ? how many wats power supply ? also what PE4L or PE4H is best to buy? any help would be appreciated