URGENT - How accurate is Audio Synch on Computer Monitor?

Hi,
Due the temporary lack of Digital-to-Analog convertor for my Blackmagic HDLink card, I've been unable to monitor audio while watching video on my external monitor. So instead I've been watching the computer monitor, and listening thru built-in audio.
(I should explain that I am listening to a mixed down audio track, so I dont have the original audio clips in the timeline to see the synch indicators. I'm doing this all by eye and ear)
I have a two-beep at the beginning of the long sequence, which I SEE and HEAR at the same time. But I've been told by someone I trust not to trust the synch using this method. My sequence is 83min if that makes any difference.
The reason this came up is that after adjusting the synch on a bunch of shots a few weeks ago, I went back and checked them again and they are off a few frames....
I've got a M-Audio Flying Cow Digital to Analog convertor on the way, but the meatime am borrowing a Home Theatre amp with Digial In that should allow me to monitor from the Decklink, but would really like to know if all my synch work is unreliable.
thank you !!!

Mathew,
You shouldn't have a problem using built-in audio if you're monitoring on the computer monitor. Built-in is low enough latency that it shouldn't matter. As you say, they appear to be in sync. If you were monitoring video through your Decklink, and audio through the built-in, then I would suspect a problem because the video D to A conversion introduces video latency.
Why a sequence would go a bit out of sync a few weeks later after making no changes is a mystery. Unless you changed something else in your system that could have changed the buffer settings for built-in audio? Just a longshot.

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