Asus P5B-Plus temp monitering issues?

So I recenty built a new gaming rig, with the intent of ocing the Chip and RAM some...

Before I go on, my system specs:

Thermaltake Armor Jr. case with 3x120mm fans, 600Watt PSU, P5B-Plus, C2D E6420, MaxOrb cooler, 2gigs Corsair XMS2 PC6400C4D, eVGA 8800GTS 320Mb vid Card, 250Gigs WD Caviar SATA300/7200RPM/16Mb cache.

Now, my system is very well ventilated. However my Tcase temps (BIOS/Speedfan) are like 39-45C idle and 57-61C @ 100 load via TAT. This is were it gets interesting... TAT and speedfan both record my Tjunction temps @ 27-31C idle and 47-50C full load again with the use of TAT. My question here is WTH is goin on, mobo or chip issue? I know for a fact that the core temps are supposed to be close = or > than the "processors" temps.

Any input would be awsome, since im quite frankly puzzled!