I found something like this on Polish marketplace:
Intel Xeon ES A4 2,8Ghz 1333/1600FSB 8MB
It's 65 nm, so it should work both in Mac Pro 2006 and 2008.
It has a multiplayer at 7x and default FSB is 1333 MHz on Intel 5000 or FSB 1600 on Intel 5400 chipset.
It looks like it's ES version of my E5345 or X5462.
Intel Xeon ES A4 2,8Ghz 1333/1600FSB 8MB
It's 65 nm, so it should work both in Mac Pro 2006 and 2008.
It has a multiplayer at 7x and default FSB is 1333 MHz on Intel 5000 or FSB 1600 on Intel 5400 chipset.
It looks like it's ES version of my E5345 or X5462.