I was thrilled to see the tile render merged into trunk, great work !
However, my go-to test scene rendered twice as slow now. I re-rendered with only 1 GPU in the settings, same rendertime.
Interestingly, psensors showed that when rendering using 2 gpus, the second one was warming up (55 celcius) , although not as 'on fire' (72 celcius) as the primary one. When rendering with explicitly 1 GPU the second one cooled (38 celc).
Anyway, is this behavior known already ?
Fixed in a recent commit, I believe. Time to svn update