Confused,which Blackmagic product for smooth playback on second monitor?

I've searched the forums but could not find and exact answer. I'm looking for smooth playback on my 22" monitor. I'm using FCP 6 on a 2010 Macbook pro with 8gb and with a 4tb Graid.

I know this is not the most up to date system, but I'm wondering what product I can use. I'm considering the Blackmagic HD Link, but that's for mostly using to make the second monitor a broadcast monitor, right? But does it help to smooth playback? Or do I get Blackmagic Intensity? Which one works best with the MB Pro with only FW 800?

Thanks!

YOu only have a FW800 port for connecting to an IO box? Then there is only one option, and it ONLY works with FCP. And is the most expensive box out there too. The AJA IO HD.

Typically IO devices connect via PCIe on towers, or Express34 on laptops...and lately via Thunderbolt. Lack those options, the only device you can use is the IO HD. There are USB 3 options, but no Mac has USB 3, and they don't work via USB2.

Shane
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