Hi Stephane

These are the same coolers as yours (Iceberq), but the cheaper aluminum version, while yours are copper. I don't use the PC this V5 is in very often, just for an occasional LAN party, so it doesn't run a lot. I have put my finger against the heatsink when it runs, and I don't notice it being especially hot. It is slightly hot to the touch, but it's not burning. The job of the heatsink is to draw heat from the chip, so I would expect it to be a bit hot anyway.
One thing I did find with plugging the fans into the 5 volt plugs, it runs a bit quieter than with the 12 volt.

Hehe... Our mods sort of look similar since I used the same brand of fans. I bought the cheaper aliminum though, and lapped the bottoms first. I also plugged the fans into the V5's fan headers, as you can see in the last pic (I should clean up that wiring eventually).

Lapped fan bottoms


Back w/heatsinks


front


The back's burgundy heatsinks came with the fans, and the black ones are merely old heatsinks I cut to size.