Cooling need help with hose/bard/thread change

Need a little help

Basically I'm going water cooling by the end of the month and I have all ½ ID tubing stuff. I haven’t bought the hose yet as I'm away from home for a week. I was thinking of using smaller hose as my case is quite cramped already as I have four HDD and three 5 ¼ bays already in use. I really do not want to modd my case.

If I do use smaller tubing/hose say 3/8 barbs will there be a massive performance difference.

The stuff I have so far:

1/2" TDX Athlon64
Laing 12V-D5 Pump
1/2" XSPC R120-D
Danger Den Single Bay
Swiftech MCB120 "Radbox"

 

You can put 3/8" ID tubing over 1/2" barbs without too much hassle. Just dunk the ends in a mug of hot water for ten seconds or so to temporarily soften the tubing up.

There will be no appreciable performance difference.