>>404990152
>Nvidia's more efficient with their memory usage and compression
You have to elaborate on that because that just doesn't make sense. 
Top of the line nvidia have wider bus (384bit vs 256bit on radeon) and higher effective clocks (gddr6x vs gddr6). Let's forget that radeon has much bigger cache than nvidia (128mb vs 6mb)
You get the bandwidth by just multiplying the effective clock by bit width (that's what wikipedia and nvidia does in the spec sheets for example). 
Where the fuck the compression comes in?