Mhmm I am kicking myself for not pulling the trigger on £450 Vega 64...I am trying to justify this by thinking perf per £ is not that good and power consumption is way to high, in which case vega 56 seems to remedy both these shortcomings.
Power usage not something I'm too worried about. Had Hawaii and currently on Fiji. Like yourself I believe the VEGA 56 is better on perf/£ basis. If I snag the launch price then the saving will be used to buy a WC block.
Hawaii even with the AIB coolers wasn't as quiet as Fury X with stock AIO. I owned Hawaii in Tri-X, DCUII and Vapor-X editions at one point. Fiji I had a chance to try Fury Tri-X, which I deemed to be quieter than 290X Tri-X, but still Fury X was quieter than Fury Tri-X.
Did once think of WC'ing Fury X, but after evaluating cost of WC I decided not to. Now I am WC'ing Ryzen rig, I think the MBA VEGA 56 will be sweet to WC. I noted last time around that WC blocks only seem to get cheaper once GPU go EOL, so best off going for WC if you want it at the get go.
I also have FreeSync monitor, sorta of in two minds if even the jump to VEGA 56 is valid. Looking at some reviews its not a huge gain and I believe with FS if you're gaming experience is 'smooth' how valid is a jump in frame rate?
The flipside is if I sell Fury X at right time I may lose less £. I was real lucky that the Hawaii cards I got on promo, sold at pretty much no loss. Snagged a Fury X by adding to pot less than what a WC block would have cost for Hawaii. How I saw it was the spend got me a quieter/faster card in a neat 'package'. Sorta aiming to do the same again. Hopefully if VEGA 56 is £449 after launch price that will keep Fury X at a better 2nd hand price (IMO).
Not fussed didn't jump on VEGA 64 and TBH glad to wait for VEGA 56 as have time to consider things more
.