According to Mark Rein of Epic Games, Microsoft had originally planned on using only 256 MB of RAM, but the decision to increase it was based on Epic's upcoming "Gears of War" title. Epic had been arguing for Microsoft to increase the memory for some time, and Tim Sweeney had sent Microsoft screenshots of what "Gears" would look like at 256 MB, and then at their proposed 512 MB. Shortly thereafter, Epic was the first studio told of new 512 MB size specification and claimed it cost them a billion dollars but felt it was better for gamers.