Lower end hardware to get a boost from Metro
A new Microsoft blog talking about win8 graphics enhancements has a bunch of marketing BS & [over?] simplification, but it does point out, emphasize that Metro on win8 is designed primarily for tablets & other lower powered devices.
http://blogs.msdn.com/b/b8/archive/2012/07/23/hardware-accelerating-everything-windows-8-graphics.aspx
I don't think that much of this particular blog, being IMO essentially a marketing exercise with what little tech info it contains dumbed-down quite a bit.
My lower-fat version: 1st there was DOS, & higher end graphics cards were just for displaying 24 bit color -- I remember paying several hundred 90's dollars for a high end graphics card just to work with still images. Microsoft wanted you to play your games in Windows, rather than exiting to DOS [which most all games did], so they came up with Direct X -- DX was/is a way for games etc. to talk to hardware like graphics cards, bypassing a lot of Windows code that otherwise made the process Much less efficient, and Much slower. DX evolved until today it's a set of directions for specific tasks that ideally are performed strictly by hardware, bypassing as much as possible the CPU & Windows. Graphics cards evolved too -- higher end graphics cards are not only faster at what they do, but can perform more of the available DX instructions or tasks... today a game might not play on the lowest end graphics hardware because that hardware can't perform the basic level DX tasks that game absolutely needs -- it might play on slightly more expensive graphics hardware, but since some DX features are missing, without all of the game's visual features or enhancements -- while on high end graphics hardware you'll see everything since that hardware supports all of the DX instructions that the game uses.
Cell phones & tablets use lower horsepower CPUs because they have to -- even if cost was not a factor, size is, & PC CPUs take up quite a bit of room physically, as well as needing yet more room for whatever cooling solution since they generate a lot of heat. The electronics slightly higher end &/or newer cells & tablets use have something similar to DX because, with their lower horsepower they have to... You can get by on the average PC/laptop without DX graphics hardware because there it's just an enhancement for stuff like games -- on a cell or tablet something similar to DX is often required just to reach the level of usability you expect from your apps/games. That's where Metro comes in...
While most Windows games use DX, most Windows apps don't -- the benefits of DX come at the cost of several constraints on how you have to code to use it... in a nutshell it's often just not worth it. Rather than worrying about getting coders to use DX in Metro apps instead of coding the same way they're used to with Windows, Microsoft built Metro & its ie10 browser around DX. Flash uses hardware acceleration with my AMD/ATI graphics card whenever it can, regardless the Flash app or video running/playing -- Metro does the same sort of thing. Both Flash & graphics card drivers are tuned to/for the graphics processors that most all PC/laptops use -- this blog talks about how Microsoft is tuning Metro for the lower powered hardware Metro was designed for. Still unknown [at least AFAIK] is whether Microsoft will bother tuning Metro/DX for hardware that's already out there running win7, in particular the lower powered stuff. They have been working hand-in-glove with the manufacturers designing/building win8 tablets & such, & have said win7 phones will not, cannot run win8, so right now I think full Metro support for existing hardware a big *IF* -- higher powered PCs/laptops won't need it but they're less likely to rely on Metro for more than a Start Menu replacement anyway.