I've been doing some research about this. For the reson "not" to need a radiator. (IMHO you never can have enough radiators)
Problem with the flexible ones : they will look ugly like hell!
Once you start bending, they will look wrangled.
In a nornal case, you don't have the space to make a good bend, so you need elbows again. and on a "soft" copper pipe, they are a lot harder to solder.
For small bend's they are just fine. (15 degrees or less)
With the ones with cooling fins, they are a lot harder to bend. Even with special equipment. Again, a small bend will be fine.
One other problem is that you need to attach at some point a elbow, or a tube. Damm, there are fins! So you need to get them of, and get a smooth surface again. Can be done, but extra work.
If you have a "free running" tube for about 10 or 15 cm, it's worth it.
Just remember that you need to have the space in your setup, and a good airflow!
Don't expect any gain for the water flow, but you coold lose 1 degree in water temp. (=0.4 degree cpu temp)
For some of us, it's worth the trouble.
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