Will ATI 5770 help me display HD video without stuttering?

I have a 1,1 Mac Pro with the stock GeForce 7300 card which powers an Apple Cinema HD display via an ADC adapter and a no-name 1280x1024 DVI monitor. Works well but my system struggles with 1080p video. I edit with Final Cut Express and frequently the video will stutter when I play it within FCE or Quicktime.
Running latest OS and the system has 5GB ram and a couple of 7200rpm discs for storing video footage.
If I upgrade to the ATI 5770 will that display HD video more smoothly, or is it the speed of the CPU in my Mac Pro which is holding me back?
Grateful for any advice you can offer.

I'd try at minimum 10 to 14 gigs of ram.

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Our showroom unit arrived 8/24.
Set it up and loaded it with my demo content. Motion rendering is noticeably faster.
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Will ATI 5770 help me display HD video without stuttering?

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