Viper Lair posted a review on the MSI X48 Platinum Motherboard

Overclocking the old fashioned way was actually very easy, despite the E6750's 333MHz FSB. With little effort, we were able to reach 490Mhz on air, which is the exact same result we hit on the MSI P35 earlier this year. Default voltage wasn't enough for this though and we were required to increase the voltages to the max allowable for CPU and chipset.

MSI X48 Platinum Motherboard Review