I'd take it to the bank.
Tested a 600MHz FSB ( on Commando ) E8400 this week on various P35/X38/X48 boards and my highest ( apart from the commando ) was my best P5K3 Deluxe that did 560MHz stable with this E8400.
Tested motherboards:
Abit IP35 Pro
2* Asus P5K3 Deluxe
2* Asus Maximus Formula
1* Gigabyte X48T-DQ6
Asus Commando
Asus P5K Deluxe
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