Awny2000 :
azaran :
Unless the new 6th generation fan is leaps and bounds above the past models, it too will suck in general. The Cryorig C7 that will hopefully be coming out soon has been tested to be a good deal better than the stock fan. Cooler Master GeminII S524 Ver 2 has a max height of 105mm and has tested very well also.
And then theres the option of water cooling depending on case and design. So what case are you using?
I am 3D printing a case which I will design myself. Because of the sizes of the available 3D printers, the case will also be limited. By low profile I mean no more than 100 mm, preferably closer to 80 mm. Do you think it is possible to cool the processor passively using a low profile heatsink with no fans. If this is possible, I will be able to make the case so much smaller, especially because the future user of this build does not want a graphics card!
It is possible, but you have to engineer the hell out of it. A company called Plex make passive cases where they use the case itself as a heatsink and they can deal with a 95w TDP in their cases. So you might be able to achieve it but it'll take a lot of work. I've you're concerned about the stock fan not pulling its weight, and need sub 100mm clearance.
Scythe BIG Shuriken 2 Rev. B - 58mm height w/fan
Noctua NH-L12 - 93mm height w/fan
Be aware these tend to overlap the first RAM slot so you'll need to check them with the ram heights you intend to use. I think the Scythe has a 35mm and the Noctua a 43mm clearance. I'd like to recommend the Cyroig C7 to you since it out performs the stock by about 20c with almost the same footprint, but they still haven't hit the shelves yet.
Also I've your designing this thing yourself, have you thought about setting up a way for putting a 120/140mm liquid cooling rig in there instead? Nzxt Kraken x31 has a longer than avg hose and has swivel mounts on the pump so it's placement could be a bit flexible for your design.