Today I tried -686-pae on my model name : Intel(R) Celeron(R) M processor 1.40GHz flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe bts and it booted fine...despite all expert opinion I got years ago. That's why an official script is needed to give the correct answer.