1600+ AGOIA and newer should be reasonably able to run at 1900MHz if you have GOOD cooling and voltage. Zoson has had even better luck. TBredAs are probably in the same range (1900-2000) but run much hotter.
I have an AGOIA with water at 1900MHz, and a AIRGA TBred (2200+) at 2000. The AGOIA is right at its limit, however.
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