I purchased a new 7th gen i3 682 and dropped an i5 into it before I'd allocated storage pools in the 4x12TB spinners. Interesting note: a 6th gen i5 would not work in the 7th gen 682 unit. I read this thread about cooling and the H5 SF, found a unit on eBay. It arrived yesterday when the 4x16GB showed up.
Before the RAM, I was idling at about 35C with stock 8GB and the stock cooler on the i5. After upgrading to 64GB, I was at 42C. I decided I'd go ahead and mount the H5 SF right away- before I tested any streaming.
The only trouble I had with the install was powering both the 3-pin pump and 4 pin fan on the unit. The Y adapters I'd bought in anticipation from eBay worked well. It's a bit confusing to see 3 pin and 4 pin y adapters the 1st time. Both sockets are the same 4-pin size but one pin is missing on the 3-pin side. Since the 3-pin connection is slotted for the larger adapter, it will fit- however snuggly- leaving one of the 3 pins exposed. Feels odd, but it works.
The H5 SF comes with stand offs that work well with the 682. Screw those into the board, slide the bracket over the cooler, and use the thumbscrews to tighten in. Could not be easier. I found the hoses and connections for the liquid easy to manipulate. Spin the connections on the sync around as mentioned here and they'll form a nice S- shape with no kinks. The large fan unit fitment is best described within as '** on a bucket.' It fits so snuggly against the case that the back screw holes must be pressed inward to meet the threads on the case. Not pretty at all, but as I will report, very functional.
Once mounted and installed, I started up and began streaming. Idle temps had been down to an impressive 30.5C- 12C less. Once streaming, I would see a peak of 40.5 that would nearly instantly return back to 35C. As a test, I streamed 3 movies on 3 devices. With i5 CPU @ 80% peaks, temps did not move beyond the peak @ 40.5.
Next for this build is 2x2TB SSDs and 2x 1 or 2TB M.2. I have one SSD and should have the other this week. I have M.2 heat syncs different from the ones the 682 comes with. I also have a small 3-pin fan I intend to use across them. I haven't put this together physically yet, but I think it'll work the way I want.