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As far as I know, there are no "official" revisions to the BBA 9800 series, in either video card BIOS or PCB design. I will say however, unlike motherboards, video card manufacturers do from time to time, make subtle improvements to their products over the course of production without necessarily changing the revision number.
Using my BBA 9700 Pros as an example (the second one purchased 6 months after the first), there were a few subtle, but noticable differences.
1. The newer card had a heatsink that has a little bit more mass to it. The top/left corner does not have the "cut" taken out of it like the top/right corner to accomdate the AIW series. It's just squared.
2. The heatplate on the back of the card towards the bracket seems to have more components beneath it - like white plastic shims and appear to be better mounted.
3. Most important of all, this specimen did not exhibit the all-to-common "wavey lines" problem that my initial 9700 Pro had.
4. Fit and finish just seemed more "refined" with the newer card. Obviously, the more you make, the better you become at it, and with this specimen, it shows.
Now this may give you the impression that it's always good to wait a little while and get a card produced in subsequent runs, but that doesn't always run true. Sometimes, once the cards have been thoroughly consumer tested, manufacturers may cut back on some components if they feel they're not necessary to reduce costs. Visiontek (and Creative before they cut out of the US graphics market) had a habit of doing this. Using my old Visiontek GeForce3 as an example, initial production runs had faster running 3.8ns memory chips that overclocked like crazy, but later runs carried the slower 4ns variety, which did meet the standard clock requirement, but offered no extra headroom. Like wise with Creative's TNT1 and TNT2 series which initially used superb Fujitsu and EliteMT SDRAM modules.
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My specs:
http://users.rcn.com/chinmonster/my_specs.txt
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