Wierd, sounds like an arithmetic error though I've never seen that one before. And this is even with the CPU underclocked right?
Is anyone else running one of these latest durons? Hopefully it's not a bug. I dont think so though, I'm sure we would have heard about it by now if it was.
You might want to try downloading the following "burn in test" and see how it goes on the CPU test. Passmark Test Utility
BTW, turn the duty up to 100% on the CPU test and turn all the other tests off ok.
Try downloading the program again and this time extract to an entirely different directory (preferably close to the root of your drive with a new directory being less than 8 characters for arguments sake).
I don't think you're that much off pace d94. Although Toolbox is 5 seconds faster with a 2.4C. Could be due to chipset difference, ram timings, etc. Does your motherboard have a "cpu interface" option in the BIOS like nForce 2's do?