Yeah, using HLSL (after a certain update to it's code, can't remember when) started to use huge amounts of GPU bandwidth with internal pre-scaling of the games internal resolution.
After the updated HLSL code, my old Radeon 4850 didn't have the bandwidth for anything past x6 pre scale.
I had to do something I never thought I would have to, upgrade my GPU for MAME usage because of bandwidth limitation (rather than in built feature set support).
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