Hi Gilles. I have a Akitio Thunder 2 pci express box + Geforce GTX 750 ti (75watt GPU), and I was just going to purchase the Thunder 3 pci express box from amazon. Are you really sure we can plug a Dell 200w adapter? Asking Akitio support about this, they said: "The maximum power output through the PCIe slot of the AKiTiO Thunder2 PCIe Box is 25W. The biggest power supply that is supported is 120W but it will not increase the power that comes through the PCIe slot. No, you cannot use that 150W power supply. The connector doesn't fit and it's over 120W. "