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What "specific" component causes HD video to lag?

post #1 of 7
Thread Starter 
In older computers, what is the component that causes the PC to have a hard time playing back HD video to where it's choppy, or when the audio is having a hard time syncing?

Is it mainly CPU processing power, hard drive read speed, GPU processing power?

This also brings me to another question:

In Sony Vegas what component helps rendering faster. I know the CPU is a huge influence on this but does the GPU improve times as well?

I'm basically asking these questions because my father has a Pentium 4 @ 3.0GHZ with 2GB RAM and a Geforce 6600. I am planning on giving him my old Q6600 w/ 4GB RAM but he won't have a video card and I need to buy one.

He renders 1080p footage in Vegas from his pocket camcorder and it's very choppy on his Pentium 4 machine and I know it will be a lot better with my Q6600 it's just that I don't know what video card to buy. Preferably under $150.
post #2 of 7
get the "program" Core AVC, it will fix most of the lag in HD video
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post #3 of 7
The Q6600 should handle the HD video by itself. Any video card would work. You can get a pretty good card for <$150 now anyway if your worried.

http://ncix.com/products/?sku=56240&...r&promoid=1300
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by JaRi View Post
get the "program" Core AVC, it will fix most of the lag in HD video
Kind of looking for future knowledge + what card to buy for my dad, but thanks for the tip anyways.
post #5 of 7
First thing that comes to mind would be the Video Card.
After that comes the CPU, then possibly the HDD.

Try defragmenting the drive?
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post #7 of 7
CPU. An AMD Athlon XP also can't play 1080p smoothly.
    
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