Quicktime movies choppy on dual 867 mirror door

Was going to sell my old machine to a kid who wanted to use it to edit home videos, but to test it out, all his camcorder short QT movies (.mov & downloaded to hard drive) played choppy. Audio was okay.
Stock machine except added 1GB memory. I don't remember it being that bad.
I've got Leopard 10.5.8 on it, but these QT movies played the same on Tiger (most recent version).
VLC makes no difference.
Out of luck?

Hi-
The X800 XT is a flashed FireGL X3.
It was flashed using Graphicellerator tools in 10.3.9 Panther.
The ROM is a modified 64k ROM from the Mac Elite Wiki Downloads.
Darn thing runs real hot with the OEM clock settings, and required finding a rare ATI Silencer for it.
I 'spose that I could have tuned the clock settings down, but that wouldn't be any fun, now would it?
There really isn't a dumbed down version, but I'll try:
For ATI cards, iflashing just requires the right card, the right ROM, another Mac that can be connected to using VNC and allow Screen sharing.
Geforce cards must be flashed in a PC.
The PC card is installed in the networked machine, machine started, and then the ROM is dumped using a dumper utility from the Graphiccellerator kit.
After confirmation of the ROM size (click/get info) the appropriate ROM is loaded into the flashing utility.
Run the permissions script (included in the utilities kit) and then flash the card.
If all goes well, then restart the machine with monitor attached.
If all doesn't go well, don't shut down or the card will need to be flashed on a PC.
Try a different ROM, and flash again.
I'll tell you right now, that getting the right card, and a good one at that, is more than half the battle.
I have a box of about 14 duds that I'll sell real cheap.
Some people on auctions will sell outright garbage without a tinge of guilt.........

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