Can i install an external gpu on lenovo y50-70. Also is it worth is? And do i always need a PSU

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Unless you buy used, you aren't going to get anything faster than a 400-500 dollar card for half its price. I would look around on eBay and Craigslist and try and find some good used stuff, just make sure it wasn't used for mining since miners often brick the firmware on cards to get them to run faster since they don't need the cards to last for a few years.
 

lol nope im noooot buying used xd
 


Then you aren't going to get anything new faster than a 1050 ti for 200 dollars.
 


okay