![]() However, this new feature came at a price: the virtualized graphics memory came out of the same 2GB pool as the application, which was especially RAM-hungry with the most powerful graphics cards such as a 1GB Radeon X2900XT. This also helps multiple 3D applications get along with each other without running out of elbow room. Another advantage of the new WDDM is that Vista virtualized graphics card memory, so that applications didn't need to worry if there was enough RAM on board the graphics card to store needed textures and other information. One of the new features of Windows Vista is a Windows Display Driver Model (WDDM) that allows such fancy tricks as compositing desktop windows using the computer's 3D graphics card. But what caused the problem in the first place? The hotfix is still considered to be "under testing" and so will not end up in Windows Update, although it will almost certainly be part of Vista SP1. Now, Microsoft has issued a hotfix for the problem that, at least in initial testing, appears to fix the Out of Memory errors. The hard limit of a 4GB address space-split in 32-bit Windows operating systems into 2GB for the OS and 2GB for each application-was getting filled up because of a bug in Vista's handling of virtualized graphics card memory. "Out of Memory" errors conjure up dark reminders of DOS and the 640 KB limit, but that's exactly what some Windows Vista users have been experiencing when running some of the latest games.
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