there is a program called cpuz. google it and download it. it should show you all you need to know about your CPU

im sure if you have your computer number you can look it up on the support site

The processor is no longer in my computer, I swapped it for a new one. Isn't there a Dell spec list somewhere for the XPS 420 which will tell me?

Yeah, I got it now. Thanks for your help.

I've never seen CPU stepping listed by Dell.

 

Look at the top of the chip.  If the writing includes the phrase SLACR it is G0 based; SL9UM, B3.

Happy to help.

 

It is a G0, right? G0 is better for over clocking.

 

BTW, many believe that the lower the VID the better the chip is for over clocking.  You can find VID with core temp, for example. 

 

VID is the stock vCore for the chip.  It varies for each chip and is determined by Intel as part of its testing. When the MoBo is set to auto for vCore, this value tells the MoBo what voltage to use to get the chip to "start up".

Yes, it is a G0. I'm sure that's what the buyer wanted to hear :o)