whatever the price is (from Low to high)

[genius.moses47]

How much would it cost me to change my Nvidia Geforce940mx to nvidia gtx 1080?

 

[BadActor]

Would really need to know the rest of your specs, but I suspect that your current system would bottleneck a GTX 1080.

 

[clarkjd]

How much would it cost me to change my Nvidia Geforce940mx to nvidia gtx 1080?

Welcome to Tom's!
Well, to start off, what ever the price of the 1080 is at the low end, plus depending on the rest of your build, any necessary parts needed to support the new GPU, like possibly, a new PSU, maybe even a new CPU, motherboard and ram. We really can't say without knowing what you are starting with in your current system

 

[genius.moses47]

well I have an HP Pavilion 15'6, 6th gen icore 7 6500U processor, 12GB system memory and Nvidia Geforce940MX Discrete graphic

 

[BadActor]

Not feasible. You would be better off buying a new PC or laptop with better graphics.

 

[genius.moses47]

besides that' there's no other way ?