I also see these options, but there is even less documentation about these (e.g. are these GDDR3 or DDR2?  What does SC mean?) but they have revision numbers more consistent with what my card reads out.
http://www.mvktech.net/co...func,fileinfo/id,2101/
http://www.mvktech.net/co...func,fileinfo/id,2378/
My BIOS actually appears to be slightly more up to date than the second of these (my version number ends in .01), so I'm guessing that neither of these are options.

Thanks for the advice - I was a little perplexed as to why a) eVGA wouldn't release these on their website if they were legit and b) why all the BIOSes were dated 2007.  I got this card and 2 DVI to VGA converters as an RMA for a non-overclocked card with a blown capacitor of a previous model, so would rather not have to rely on eVGA's good graces again.
 
I recently had a motherboard fail and have had issues with my core and gfx card overheating, so I've been doing a bit of a system overhaul lately.  My new motherboard is just now starting to play nice (once I ignore nVidia's drivers and only look at Asus [MB] and eVGA's sites for driver updates).  My 8600GT was up to 80ish degrees this morning, even running fan at 85% using Precision.
 
One thing I noticed though is sometimes precision loses control of the fan and it drops back to 30% or 40% fan, even though the card is hot.  I have uninstalled all nVidia tools and RivaTuner, so I don't know what else would be grabbing my fan.  Is precision known to drop control of the fan to the hardware from time to time?  If I go back into precision and un-control, re-control it, I get the fan back up to speed.
 
Any further advice is appreciated.

Thanks again.  Ambient temperature is somewhat warm, but CUDA seti@home is really pushing the graphics card temperature through the roof.  When I use the computer for non-graphically intense applications, I'm pretty stable at 73 C @ 40% fan, but even at 100% fan my temps keep climbing and climbing under heavy load.  I haven't done compressed air yet, but I really should.  I just don't like having it around and letting my kid have access to it:P  I've mostly just knocked off the bunnies from the fan and the exit(?) of the heatsink manifold without removing the faceplate.
 
I have a tower case that has 3 fans in addition to the PS.  My PS fan exhausts (hot air out) as did initially all 3 other fans.  Unfortunately none of these fans are on the front/bottom.  I have one "small" fan on the side of the tower almost directly in line with the CPU (which has a fan that is also trying to suck away from the same location). One same-sized fan in the top of my case about halfway along.  And one large-sized fan in the rear of the tower near to the PSU and the CPU (with direction of airflow across the board).  I recently reversed two of these fans: the one in-line with the CPU (so they aren't trying to pull the same air) and the one in the top of the case to encourage airflow across the board.  However, my GPU in the closest PCIe-16 slot is outside of this airflow path, and may have been better with passive pull in through cracks in the case when all fans were on exhaust mode.  I'm thinking about re-reversing the fan at top so that the only fan that is blowing in cold air is the one from the side (onto the CPU/heatsink assembly) and relying on passive leak-through and airflow throughout the rest of my case to supply the air that's later exhausted.  Another thing I'm thinking about doing is opening up the unused card slots further away from the fans than the gfx card so as to get some direct venting for the card, but I'm afraid this might lead to more dust buildup.
 
I suppose I can make photos if they help:P  In any case, if I'm to make a homemade air filter, what material(s) can I use that wouldn't insulate too much heat, but would actually be fine enough to trap dust?  I have some ~1/8 inch thick gray packing (flexible) foam and can probably pick up some cheese cloth or gauze...or maybe even some porch screening material from a hardware store.  Or anything else that's cheap and that I can use both over my fans and over the unused PCI-type slots in the outside of my case?  I also have access to .45 micron filtration material and standard coffee filters, but I have a feeling these are both too fine-grained to allow enough airflow.