JEDEC lists PC6400 memory to run at [email protected] volts. I suspect he is buying JEDEC complaint memory but the motheboard is not liking what it is seeing.
A BIOS update may be in order if there is one available and it offers better memory compatability.
Been running D2OL now for over twelve hours and it seems to be jumping between 46 and 48 degrees. Now that I know everything works I will pull the chip out and lap it down to 1,500 grit and use some AS5 on it.
Quite the opposite in fact, all AMD Athlon MP CPUs save for the 2800+ were 256Kb parts, just like the Sempron.
Regarding the voltage, you are giving it way to much for the clocks speed it is running at. Assuming you have a B0 stepping T-Bred core (which you should have) you should not need...
I picked up the same combo for a friend of mine last week, got a 32-bit cpu.
You got a D0 stepping, which is a Winchester based Sempron. Origionally these were 32-bit only but AMD flashed the CPUs to be 64-bit and repackaged them. The Venice based Semprons were 64-bit enabled from the start...