Linked Display Adapters
A linked display adapter (LDA) is a mode of operation in which multiple physical adapters are merged, thus appearing as a single logical adapter. From an application’s point of view, only the logical adapter is visible. However, the underlying WDDM driver uses all the physical adapters within the link to improve the performance of the logical adapter. The logical adapter typically offers much higher performance than any of the individual physical adapters can provide.
The driver can link physical adapters that have identical capabilities and identical memory configurations. Every physical adapter that is part of a logical adapter must be visible on the PCI Express (PCIe) bus as an independent device. The model assumes that all nodes in a given physical adapter have uniform access to the physical adapter’s memory.LDAs are supported only on the PCIe bus. LDA configuration is not supported on accelerated graphics port (AGP) systems.
Multi-GPU & Aero Glass
After careful consideration of the market segment and the complexity involved in the working of multiple GPUs, it was decided that some of the new WDDM v1.1 features will not be made available on such systems.
For example, Windows 7 will disable system memory savings for Aero Glass if two or more active graphics adapters are present. That feature depends on device bitmaps that are disabled when the desktop is extended across multiple monitors that are driven by multiple GPUs which are not linked together.
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Added two new pages on the improved Multi-GPU support in Windows 7.