This thread caught my eye b/c I've been asking the same question for a couple of years now.
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Bottom line is this: A rig to do both gaming and video editing well isn't cheap. Each high-end part needs another high-end part in order to function at max capacity and of course it will all need a high-end powersupply...which puts a high-freaking-end dent in your wallet. :Q Going high-end requires a total commitment...from your wallet.
I currently edit HD video on a Q6600 (at stock 2.4GHz) quad core with 2GB of memory and a big SATA hardware raid setup (3Ware 9650SE-8, 6 discs total). I don't need the disc speed so much as the space and the redundancy. But a hardware RAID card beats the snot out of any onboard raid, any day.
I also game a lot. Newer games like Crysis and Hellgate: London to name a couple, ARE multi-threaded and will take advantage of multiple CPU cores. So will Sony Vegas Pro and Adobe After Effects. Will games use 8 cores? Today, I'm not sure...tomorrow, most probably! I know for sure the two games I mentioned use 4 cores.
I'm currently spec'ing out a dual Xeon rig using a
Tyan S5396A dual Xeon board. and two, 2.33GHz quad core Xeons. It would cut my rendering time in Vegas 8 Pro by more than half. That's a lot of time gained when comparing a 60-minute render to a less than 30-minute render.
Most dual Xeon (and AMD dual socket) boards have onboard SATA raid that would do a decent job. CPUs are so fast these days that CPU overhead for raid calculations isn't too bad under normal usage. If we're talking a big database server, then sure, you need a hardware raid card. But you could get away with just the board, CPUs and memory, then add the raid card later, budget permitting.
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I admit it is debatable whether to spend all that money to save 30 minutes or so...but "worth it" is always relative and most of us surfing these forums are not typical brain-dead computer users but enthusiasts that always want BiggerBetterFasterMore. That's me, anyway.
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Hope this helps somehow.