I shoot A Sandisk Extreme 60MB/s UDMA card in my Canon 1D MIII, and just today wished I had more speed while shooting some sports. I went on line to find a current review of memory card performance, and saw surprised to find very little. Many of the reviews were 5-10 years old.
I understand that the claims of the manufacturers often do no match real-world performance. I figured somewhere out there would be somebody who is testing these things on a regular basis, but so far no dice. Consumer Reports just said "don't pay for fast cards, since you won't need them for your point-and-shoot". Duly noted. Couldn't find much on dpreview. Rob Galbraith had the best info, from 2008 for my camera.
Any other places to look? Any advice would be much appreciated.
Your 1D3 is the issue . It's not UDMA . So those speeds in the RG database are as fast as you will get. In fact some UDMA cards may be slowere than non UDMA but you won't find many non UDMA around now (if at all)
Notice the 1D3 is faster using the SDHC cards in the database.
If you want faster write speeds then you need a UDMA body. 1Ds3 is (but bigger files and slower fps negate the advantage) or the 1D4
Consumer body wise the 50D was the first followed by the 5D2 and then the 7D (nothing else uses cf)