LinuxQuestions.org - linux reported stepping VS intel stepping

ok, forgive me if this has already been answered, but i ran a few searches and came up with nothing usable....

i currently have a p4 xeon system, with a dual-capable motherboard, but only one cpu installed. i would like to upgrade to dual, but i know the stepping has to match. when i use cpuid or cat /proc/cpuinfo, i see that my stepping is reported as "9" but intel lists their stepping like "M0" "D1" or "C1" how do I know what processor to order with the names not matching? also, i can't seem to find anywhere without rebooting whether i am on a 400 or 533 bus...

here is my cpuid output:

Code:

processor      : 0

vendor_id      : GenuineIntel

cpu family      : 15

model          : 2

model name      : Intel(R) Xeon(TM) CPU 2.80GHz

stepping        : 9

cpu MHz        : 2790.839

cache size      : 512 KB

fdiv_bug        : no

hlt_bug        : no

f00f_bug        : no

coma_bug        : no

fpu            : yes

fpu_exception  : yes

cpuid level    : 2

wp              : yes

flags          : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid

bogomips        : 5570.56

so basically, i need to know what to order from intel, so i only have to tear the machine apart once, and it will run right when i turn it back on...

thanks!