My Late 2015 iMac 5K with the M395X arrived today.
4.0GHz quad-core Intel Core i7, Turbo Boost up to 4.2GHz
32GB 1867MHz DDR3 SDRAM - two 4GB
3TB Fusion Drive
AMD Radeon R9 M395X with 4GB video memory
And the tests so far:
- BlackMagic disk speed: 662MB/s write, 1833MB/s read.
- Cinebench R15: 103 FPS OpenGL, 872 cb CPU
My Cinebench R15 results are similar
: 106 FPS OpenGL / 862 cb CPU
The keyboard is fine but I ended up switching back to my standard with numeric keypad.
I did find that I couldn't boot into Recovery mode using the new keyboard but could with my old one.
I also like the longer key throw on the numeric keyboard.
The mouse is an improvement as it's a bit heavier and for me that's an improvement.
Having run Lightroom 6 a bit, it is a very satisfying experience.
Not hearing any fan noise whatsoever. YMMV since I'm 62!
Here's some temps, w/not much activity, shown in centigrade from iStat: