R420 - E5-2600 CPU Support?

Hi All-

I noticed the BIOS update from March 7th mentions E5-2600 CPUs for the R420. 

http://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverId=075V7

However, offical documentation still shows support CPUs as E5-2400 and E5-2400vs.  Can anyone elaborate on the patch notes?  Does it mean the E5-2600 is now supported?  Thank you.