You have to be careful with that list in the man page. It's pulled straight from upstream, and is not accurate for the BSD operating systems. For example, at the very least, the BARTS, TURKS, CAICOS and CAYMAN chipsets won't work (at all) with the radeon driver on any BSD (due to lack of kernel modesetting).
Having said that, HD5xxx GPUs do not require KMS for basic modesetting in X and so 1440x900 should work if the radeon driver is new enough. Again, though, there will be no acceleration (which is also not made clear in that man page).
Adam
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