Best -xchip option for Intel Q9?50 processors?

The StudioExpress distribution from July 2008 supports some new -xchip arguments for chips like the Penryn and even has an -xchip argument for the Nehalem.
I have an Intel Q9650 (I think that means its a Wolfdale, but I could be wrong) in my brand new workstation. In the rare cases when I want to maximize performance, what -xchip or related option should I be using?
If I just use
-xtarget=native -m64 -xarch=native
will the "compile for the host processor" be able to tell enough about the Q9650 in my workstation so that it
chooses the correct settings for things like -xcache?
Thanks,
Tim

You don't need to use -xarch with -xtarget, -xtarget is a macro that will expand to include -xchip and -xarch etc.
For cc you can simply do a
-xtarget=native64 -#
-xtarget=native -#
or -fast -#
and you will see what the macro expanded to, it shows the -xarch and -xchip for your native machine.
For CC, replace -# with a -v.

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