G5 Dual 2 GHz won't smoothly play 720 or 1080 HD Quicktime Trailers

Dual Processor Power Mac G5 2 GHz with 4 GB of RAM
I could have sworn that my G5 used to be able to play all levels of HD movies smoothly as anything sometime during normal Tiger usage.
Then one day, I noticed my G5 when on Tiger would stutter playing anything about 480.
I thought the upgrade to Leopard would fix this. But just today I upgraded to 10.5.3 on this G5 (I used the upgrade option on the install DVD to upgrade from Tiger) and it STILL won't play HD trailers 720 or 1080 smoothly.
is this supposed to be? Do I not have the minimum requirements to watch those kinds of resolutions anymore?
I know this machine is 4 years old now, but seriously? That seems crazy to me.
Does anyone else have this configuration and see similar or different behavior?
thank you

at least I finally hear of someone else w/ the same issue
your machine should, in my opinion, completely be able to play HD quicktime movies.
the funny thing for me is that once, I had 10.5.1 (or even 10.5.2) on a FW drive, and I COULD play them smoothly when booted from it
and now that I have 10.5.3......I can't

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G5 Dual 2 GHz won't smoothly play 720 or 1080 HD Quicktime Trailers

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