Razer's latest stab at an external GPU case, the $299 Core X, is its most interesting one yet. Like the company's earlier models, it's a way for you to bring the power of a desktop video card to ultraportable laptops. It just does so for much less than the $499 Core v2. And, strangely, it's a better choice for many gamers, since it accepts large 3-slot video cards. The Core v2 only had room for 2.2-slot GPUs. Additionally, the Core X has a beefier 650-watt power supply instead of a slim 500-watt PSU, which gives it room for growth as video cards ans laptops get more energy hungry.