You're right that Intel HD 4400 and even HD 5000 graphics aren't for serious gaming. But they're fine for games like SIM City and Civ V (I play Civ V way too much on my Ultrabook). We'll have a video review of the Samsung ATIV Book 9 Plus up tomorrow and it's a really sweet machine with a strong casing that's good for travel. The Yoga Pro looks nice but it's not out yet and we don't have a review unit in house yet (hopefully soon).
-------------------- Lisa Gade Editor in Chief, MobileTechReview