Noisy images on projector using 10m DVI cable

I am looking for feedback from other Macbook Pro owners who have tried running a digital projector from the DVI output on the maximum cable lengths that have been successful.
Background Info - I am running a wilderness show from my Macbook Pro to a JVC DILA SX21 projector which may be up to 10 metres away in certain venues. I was able to do this with my Powerbook G4 but the image from the MacBook Pro has a lot of "sparkles" which indicate that the DVI signal levels from the graphics card are not sufficient to run the 10 metres. I can use up to 5 meter cables OK but am having to look at investing in a DVI amplifier to get a "clean" image. The 10m DVI cable I have is a high quality LINDY product and works fine from my Powermac G4's DVI output, so can anyone confirm whether this lower DVI signal output is a "feature" of the Macbook Pros or whether I have a dodgy video card.

Thanks for your response. The situation that would require the 10m DVI cable is one where to avoid setting up in front of the audience we can mount the projector from a roof beam, then run the DVI cable overhead to a rear sound desk. I have thought about trying to assemble the presentation using Keynote and using the IR remote - that may well be an option to keep the gear away from the audience in some venues where a short cable can be used. Your comment about the TMDS clock rate being lower with lower resolution images may explain why I was able to run PAL 768x576 resolution video to the JVC projector OK from the Powerbook G4 with the 10m DVI cable. With the upgrade to the Macbook Pro I am now running full projector resolution of 1400 x 1050 at 25fps, (3.3 times the PAL data flow) and some HD video which the projector is down scaling.

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