@ Poloasis -
Loop order has no more than ~ 0.5c difference
Shortest loop path (like routing) between all components results in better performance.
Less hosing = more flow = lower temps
The old tubing size question
Also proven to have almost 0% difference unless you're talking about the jump from 8mm to 3/8" - flow is the biggest change and again, it's been tested and only accounts for ~0.5c
The use of multiple angled fittings can add as much as 8" worth of extra hosing in terms of flow which can increase temps...
However NOTHING can beat TWO or more loops for that setup rather than just one.
Again, Swiftech have done thorough testing on this under normal circumstances it's better to have a single loop than have multiples. Dual benifets the GPU's but single has nicer effects on the CPU.
Don't get me wrong though, all these things can add up to be a few degrees... whether or not those extra degrees make enough of a difference to your desired temperature though is another question