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To at least make this /g/ related......
While browsing for a new gfx card today I saw that the upper radeon range has fits a PCI-e 2.1 slot but can't find a motherboard that matches it. I imagine that it fits the normal 2.0 PCI-E slot since otherwise they would be useless but does anyone have any idea as to why they did this or if it has any effect on performance?