A big improvement for linux miners.
One caution though, the power draw at least for 380 and 280 class cards also goes up somewhat proportionately. For the ASUS 280(x) cards, the sols/s just about doubled along with the power draw.
With this jump I had to do some rearrangement of the power distribution.
If you are already running at the limit of your power and cooling budget, you may want to go over your power/cooling distribution layout before you make the v5 jump.