This is a picture of my copper chilltank with pelts. attached. I use two 5V pelts which run off my system PSU with no problem. This setup keeps my CPU around ambient or below. There is also a water chiller in this setup, will post some pics. when I get a chance. Current temp. in my computer room is 24C and my CPU is 19C.
Chilltank picture
Chilltank interior
I currently use a second water loop and block to cool the hotside of the pelts instead of the air cooling shown in the picture.