Multiple Device Vs Multiple Swap Chain

	Multiple Device	Multiple Swap Chain	Multiple Viewport	Multiple Surface Blit
Resource Consumption	Very Large	Large	Nearly free	Medium
Resource Sharing	No	Yes	Yes	Yes
Multi-adapter	Yes	No	No	No
Multi-head	No	Yes	No	No
Resizing	Slow	Slow	Fast	Depends
Can Be In Different Window	Yes	Yes	No	No

最近因为工作关系看了一些这方面的东西，自己整的表，不对请指出。