-I would run the 3200+ and make sure you have the newest bios first.
-It could be the auto cpu settings are not setting up the cpu right.
-Put the 3200+ back in, boot into the bios,
-set the multi to 10x
-set the voltage to 1.4volts.
-set the ht bus to 800mhz.
-set the memory to ddr-333 (166mhz)(if it's ddr-400 memory) or if it's ddr-333 set it to ddr-266 (133mhz)
-Then swap cpus after the 3200+ is running with those settings. http://www.asus.com/Motherboards/AMD_Socket_939/A8NE/#CPUS
It looks like it supports the opteron 170 but since bios 1011.