yeah the card I had that burned up was the same card as yours, the 9800 Pro, w/ 128MB
So I put back the stock Nvidia and HD video improved to the point I could watch 720p.
Interesting. Unfortunately, I don't have an Nvidia to try. Mine came with a Rage 128 and it SUCKS (well it worked better in OS9 since the 9800 Pro isn't supported there with any acceleration, but then I get no sound in OS9 since I upgraded the CPU for some odd reason).
I wonder if the problem might actually be hardware acceleration, that is to say that the faster CPU might be better suited for 720p video than Core Video trying to take over "some" of the functions in hardware (obviously not the H264 decoding). I mean really I was sort of surprised 720p video wouldn't play with a 1.8GHz 7448 CPU. My PowerMac only rates 1/4 the speed of my MBP and that's with 1 CPU core instead of two (i.e. it would have been closer to 1/2 speed had I bought the dual 1.8GHz card). In other words core to core, it's nowhere near as slow as I would have thought for given the age of the machine... I mean think about it. An upgraded computer from 2001 is almost within 50% of the performance of a single core of a 2008 computer of a supposedly faster architecture. Even the overall GPU scores are only around 2.5x faster on the MBP and 3x on OpenGL (sad?) My hard drives had higher scores on the PowerMac until I recently upgraded the MBP's internal drive to a 500GB Hitachi 7200RPM and now it's only slightly faster. I bought the fastest RAM available for the PowerMac so I doubt that's it relative to yours. I think the bus speed might be the biggest bottleneck there.
If you had stock 500Mhz CPUs then your model is a Gigabit Ethernet. The Digital Audio had dual 533Mhz due to the 133Mhz bus versus the Giga's
Yeah, they were dual 533 now that you mention it. I pretty much forgot since I only had them in there a few months (bought it used at a computer show) before I upgraded it.
I've also noticed my DVD-Burner drive (Pioneer model) doesn't reliably burn DVDs in Leopard, but works fine in Tiger. I don't think Apple really cared to fix all the bugs in Leopard. They were too much in a hurry to dump PPC and move onto this "Snow Job" version of the OS, which quite frankly isn't noticeably improved in any noticeable aspect IMO on my MBP over Leopard (maybe the black pop-up menus look better). The MBP tested faster under Leopard! (so much for efficiency improvements....)