Well since the ASUS Maximus Formula is able to be flashed to the Rampage bios, I would think the X38 and X48 chipset is the same, along with the rest of the board's layouts. If the X48 was a 65nm chipset, I dont think this would be remotely possible.
Just my 2 cents...
edit: Well I felt like taking a huge chance tonight by flashing my P5E to the Rampage bios. It was actually a painless procedure that took about 5 min! So I can say that my P5E is now running the X48 Ramapge bios without issue.
I found it strange that CPU-Z and Everest both detect the board as the P5E, but the bios is detected correctly with the 0219 Rampage bios string:
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I did have to disable some of the temp sensor features to keep warning messages from posting about the non-existent sensors making false readings. But the other temps like CPU and MB temps are still working correctly.



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