Ritual Programmer Mark Dochtermann updated his .plan with an update on the status of Sin 3DNow! support, which is not included in the version 1.04 patch. Here's the deal:

3DNOW update
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We are currently in the middle of doing optimizations for 3DNOW with AMD, unfortunately they were not ready in time for version 1.04. Version 1.04 includes the same ref_gl_amd.dll that I had released as beta 2 weeks prior. If everything goes as planned, we should have a new beta dll sometime next week.