Hello,
here is the information you need
1: Cooler Master Seidon 120M
http://dvtests.com/?p=11766
2: Cooler Master Seidon 120V
http://dvtests.com/?p=14425
Apparently the tubing on the 120V is exactly the same as previous Seidon generations. The tubing specs are:
Outer diameter: 8.1mm
Inner diameter: 5.8mm
Thickness (minimum- Corrugated): 1.15mm
However in accordance with some reviews Seidon 120M has a more quiet fan and is a little, some about 3-5 c cooler, which justifies the reason it is some about 10$ more expensive, so my suggestion go with Seidon 120M if you can afford it, if not you won't lose much
Don't foget to close the thread, when you feel you have no other questions