I had the same board and both are great upgrades. With that said stock TDP goes out the window as soon as you start overclocking. I would go for whichever suits your OC goals and have fun . I ran a 5670 in mine and it was rock solid at 4.2ghzI'm thinking of getting either a W3680 or X5675 to upgrade my trusty old i7 920 which sits in a Gigabyte X58 Extreme motherboard. The W3680 has an unlocked multiplier but also has a higher TDP when compared to the X5675. I can get both for the same price and would like to overclock the CPU, wondering if anyone can shed advice on which one to get?