Worth Buying GTX 1080 Ti For £350 Pounds

Sep 18, 2018
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Is it Worth Buying A GTX 1080 Ti Aorus Gigabyte EXTREME Edition For £350 ????
Im buying it off my ICT teacher and he is trusted and i've bought things like CPUs from him before for like £150 so he is not scamming me. He is selling it for low cause he wants to get rid of it for a RTX 2080 Ti
 
Sep 18, 2018
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Thank You :D just making sure
I can definitely run it
My Specs are:
CPU:Ryzen 2700x 4.35Ghz OG
GPU:GTX 1060Ti 6GB
RAM: 16GB Corsair Vengeance
Motherboard: ASUS STRIX X370-F
And most importantly a RM750x
How ever the card is Overclocked to 2000Mhz so would i need a 850 or 900W PSU?