When will you be coming out with the review of the 645LT cooling the 3900x? I was curious as to whether it would be a good fit thermally, or if it's better to just go with a 3700x for the lower TDP.
The AIO radiator with a fan will be mounted under the PSU and next to that (under the motherboard) a second 92mm fan be mounted. Is that what you're asking about?
Sorry no one ever got around to replying to your post. I'd really appreciate it if you'd post pictures of the build though! I'm planning on doing a dan a4 v4 build with a 3700x, and 645LT as well. So far I just have the case and aio ordered though.