You're correct about Most Wanted, I incorrectly associated it with the Frostbite engine. It's a bit weird that they'd ditch XP support for the Run and Most Wanted, but retain it for Rivals. Not least because Frostbite last supported XP with three games; Bad Company 2, BC2: Vietnam and Medal of Honor. There's literally no chance Frostbite 3.0 will ever run on XP. Frostbite 2.0 was entirely DX 11 as well.