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  1. 512MB Graphics Cards have proven to be problematical when used with Windows 9x. I ran some tests with a nVidia 7200GS and a nVidia 7950GT on various Motherboards to determine why. Apparently nVidia decided to change their design approach after releasing some 512MB Cards. Previously they provided access to the entire Video RAM through the Memory Mapped I/O Space. This approach unfortunately limits the amount of System RAM that can be used by 32-Bit OSes. With the later 512MB Cards they decided to Bank Memory access through a smaller MMIO Space, typically 256MB. Starting with the 8xxx series they also implemented a Memory Page Mapper similar to the MMU in the CPU. The 7200GS is an example of the earlier design. The 7950GT is an example of the later one. The 82.69 nVidia Driver does not recognize the difference between the reported amount of Video RAM and the size of the MMIO Space allocated to the Card. The Driver overwrites the MMIO Space above the Video Card's allocation. Depending upon what is in the next 256MB of MMIO Space, your Computer can crash or other Devices, such as USB, can malfunction. A few people have been lucky enough not to have anything important in this space so they have been able to use a 7950GT although they only get 256MB. Others have not been so lucky. I have developed two solutions for this problem. 1. A Patch to the 82.69 Driver to make it recognize the smaller MMIO Space. 2. A BIOS Patcher for the nVidia BIOS ROM to increase the amount of MMIO Space it claims. The first is more universal but limits the Video RAM typically to 256MB. The second provides the full 512MB Video RAM of the Card. I am preparing a Package to put on my Website.

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