Hi,
Is there anybody who has the experience to share textures(in video memory) among multiple GPUs?
I'm doing multi-monitor development. On the machine(OS is win7), there are two or more ATI display cards(FirePro 2460 or other), each display card has one GPU and more than one output(FirePro 2460 has 4 outputs).
As the SDK mentioned, Direct3D resources can now be shared between devices or processes from Direct3D 9 for Windows Vista, so for each monitor, I create a Direct3D9 device; only one device create the texture and shared it to other devices. This can work well for one display card(that means the machine only use one display card's 4 outputs and connect to 4 monitors), but for two or more display cards, when calling CreateTexture and pass the shared handle to it, it return 0x80070057( An invalid parameter was passed to the returning function).
Can anybody tell me that whether Direct3D support it or not? Or other methods?
It seems that OpenGL can share textures among multiple GPUs.

You can't share contexts between GPUs. You have to manage the textures to each GPU separately. More (OpenGL-specific) information can be found at http://www.equalizergraphics.com/documentation/parallelOpenGLFAQ.html

Forgot to mention this: there is also WGL_NV_copy_image to do GPU->GPU transfers.