You should get your platforms up and running before looking to get sponsored.
You need to have something to show for.
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as blazek said - AMD would get nothing from you from sponsoring you and send you a free pc // if you have 50k subs and upload 3 vids per week with at least 35k views it would still be "not enough"
btw - if you want to get more views you should improve your english because your possible audience is then much larger; for YT and twitch it isnt needed to have a "strong" pc - even my old FX-8150 served me well for this task for 4 years // have in mind you can use Hardware Encoder for streaming (as long as you didnt use a webcam)
so to get sponsored: create good content - this will generate views and subs - this will bring the industry to sponsor you