I have the same motherboard purchased retail from Newegg a year ago. My temps at idle are slightly higher than yours. However, when I place my computer next to the balcony door (opened about 6 inches to let cool winter air 8 Celsius some in) and remove the side panel, the temps go down 25 percent. This tells me the temp sensors (located on the motherbaord underneath the CPU and also inside the Nothbridge chip) are working fine. IMO Intel used a cheap heatsink on the Northbridge. I checked Asus motherboards with the G31 chipset and theirs are more robust copper material. You may want to modify your side panel and mount a fan to blow directly to your Northbridge or prop an 80 mm fan on the video card to blow towards the Northgridge. I use PCwizard, real temp, and core temp. The harware monitors within the BIOS matches the temps in PC Wizard so there's no software error reading the temps.