Optimal rad intake/exhaust setup

[foolishlywise]

I am in need of a tiny bit of assistance.

 

So, I've had to rethink a loop because using some simulations and thought as the drain port originally planned would have failed to work. Originally, I was going to have it as follows: 
RES to PUMP to CPU BLOCK to 140MM RAD (exhaust) to 240MM RAD (intake) and then back to res. Rationale here was to have the rad with the exhaust being the first stage cooling and then the bigger rad with intakes to be second stage cold air cooling. However, the way it's mounted would mean the 140mm rad would not drain. 

 

So I've thought of another solution: having the rear as an intake as well as a front single intake and then exhausting up the top of the case. See picture. This is due to forward planning for a (hopefully) 1070 watercooled sometime in the summer after I finish second year uni (plus bursary ftw!)

 

Can anyone spot any issues with this? Proposed loop order:

RES to PUMP to CPU BLOCK to 240MM RAD (exhaust) to 120MM RAD (intake) to RES. 

 

The alternative would be to flip around the 120mm rad rear to be an exhaust and use the 240mm rad as an intake. On this, can anyone predict how far the temps would increase by having the last rad in the loop before the res as an exhaust? 

 

 

Base spec: Motherboard: X99-E WS 10Gb, 6800K OC'd (I hope).

 

Cheers

 

 

[foolishlywise]

Answered my own question: there was something like a 2degC difference with a test mobo, processor and some older bits thrown in with the loop running using the 140 and 240mm radiators.