Yellow is that 42C idle or under load and i assume its overclocked a bit obviously j/w cuz my 3800+ isn't overclocked and i use a arctic cooler freezer 64 pro and mine stays at 32C idle and gets to about 44C under max load I up'd it to 2.2Ghz to try it out but i saw no speed increase and it only went 2C higher on each.