I would imagine that any chipset that works in that controller will remove that speed setting. When they make a performance chip they start with some set of software and probably only change a small portion. It isn't likely they would start with software that had that particular characteristic.

They also are likely in performance software to remove that setting anyway.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician