Originally Posted by Pings
I've tried both (Push⇇Shroud⇇H50⇇Pull) and (Shroud⇇Push⇇H50⇇Pull), with no difference. If I put the shroud on the other side of the H50 I gained 10Â°C. With dual shrouds I got air flow problems, and I also gained 10Â°C. Right now I have it (Push⇇Shroud⇇|Case|H50⇇Pull).
I'm surprised by this. Putting a shroud before your push fan (the bolded bit in the quote) should make no difference whatsoever to temperatures, which also suggests that when you have a shroud between your push fan and the radiator (your first suggestion) you should have improved nothing over normal push/pull, since you report no difference between the two. This is confusing.
I would imagine that your current setup is the best:
Push -> Shroud -> H50 -> Pull
but it should be a noticable improvement over:
Shroud -> Push -> H50 -> Pull
which should net you no gain over normal push/pull.
ps. Your arrows also go the wrong way - I see what you mean but your air is travelling in the opposite direction which is confusing