HD clips not playing smoothly in viewer

Hi all,
I'm having some issues where all the HD clips I captured (using a blackmagic DeckLink HD card) are playing a little blurry, and won't let me play at higher than 1x speed without the audio getting choppy.
The clips play very smoothly in QuickTime player, even at higher than 2x speeds so I feel like it must be a problem with FCP's configuration. Also, my colleague is editing the same clips on a similar but older machine (with less RAM, VRAM and a slower processor) and it works fine. The only difference I can see is he has the blackmagic card on his computer and i don't, but if that was the problem I don't know why it would play so well in QT player.
Please help!

On both machines the clips are being stored on internal ATA drives. I thought it was drive speed at first as well... I originally had the clips on a FW800 drive and transferred them to the external hoping it would help, since my colleague's clips were on his internal and were playing fine.
Unfortunately there's been no improvement. I would also expect it to play poorly in QT player as well as FCP if it was just drive speed.

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