<b>Accept the challenge.</b><br><br>Alienware™ X51 offers powerful digital entertainment, customization options and upgradeability in a size designed to fit any space. With a 3DMark Vantage Performance Overall Score of up to 15,3102 and a PCMark Vantage Overall Score of up to 10,5313, Alienware X51 is a system that's ready to help you face the challenge.<br><br>Operating system.<br>Windows® 7 Home Premium.<br><br>Graphics for greatness.<br>Alienware X51 lets you take in every detail with graphics options, including the 1GB GDDR5 NVIDIA® GeForce® GTX 555* discrete graphics card.<br><br>Pure processing power.<br>Alienware X51 packs processor options, including the powerful quad-core Intel® Core™ i7 — the brains leading you to epic new victories.<br><br>You've got speed.<br>Run several high-end applications with ease. Alienware X51 offers up to 8GB of high-performance dual-channel DDR3 memory.<br><br><b>Release your potential.</b><br><br>There are always new obstacles to face and new chal