Yup,
I picked up the vert GPU conversion kit for my Phanteks P400 months ago not realizing that it required case modification to install. Had to cut out all the PCI slot dividers on the back of the case. I probably could have done a better job had I been willing to take the build apart and use a dremel/zizz wheel to cut those out, along with a little paint. I got a wild hair this weekend and went ahead with the install. Measured distance (from side glass as opposed to basement bottom) with this conversion and the original install is minimal, but BOY do the GPU temps change.
I am seeing between 4-6 C higher temps for the same load almost regardless of where I set my fan curves. I can have this thing sounding like a remote drone and it just isn't helping a lot. It isn't heating enough to go beyond design limits, but I can certainly tell the card is getting hotter than it ever had by smell....
It does LOOK astounding, but now that the case is modded, read as damaged beyond coming back, it isn't something that can be readily undone and not trigger me with the gaps. On the aesthetic it turns it all the way up to 11. The function loses all it's cool points (literally).
I have to say that based on this particular case and the heat production of this older gen card it is something I would like to go back in time and change my own mind. Can't even imagine had I decided to do this with a planned upgrade. -1 Interwebz for vert GPU brackets.