The Raid controller will have more impact than the disks. No Caviar Blacks however because of the WD TLER 'feature', which makes them unsuitable for parity raid configurations. Either opt for the expensive RE4 version or opt for the more affordable Samsung F3's. Velociraptors seem like overkill. Number of disks in the array is more important than RPM's.
SLI is not supported in anyway, but to know whether it creates problems, well, try it and you know it. It does seem a costly approach however. Simple, there is no benefit at all from multiple video cards with CS5.
Instead of the 480, have a look at the 580, which runs cooler and quieter.
Wow, I didn't know the Blacks were unsuitable for RAIDs... interesting. I'm curious though, Harm, I saw somewhere you had a slew of disks in RAID 30. How did you assign them? Have you compared the speed difference with your setup between RAID 3 and 30?
Have you or someone you know tried the 580 yet? Does it work with the hack and is as stable as the 480? I am surprised that Adobe is not faster in their card testing/approval process, as the 480 has been out for a "while" (considering Moore's Law). Still haven't seen any benchmarks comparing GTX and Quadro cards with MPE. I'd be really interested in that, seeing that the price difference is anywhere from 3 to 8 times more expensive... and the performance gain is most likely not proportional to the price. But I did read that GTX cooling is crucial when it's working hard (or it starts slowing down), as opposed the Quadro, which remains stable under a heavy workload.
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Have a look here: PPBM5 Benchmark
Bill is the first one to have submitted 580 results and yes, it works quite stably with the hack.
IMO, the Quadro's are way overpriced. They do not deliver extra performance and the only thing that speaks for them is the 10 bit color output that they are capable of if you have a suitable monitor and in some cases (5000/6000) the increased amount of memory.
As for 10-bit color, it would/could be useful, but my output will be displayed on a AJA or Decklink card.
Thanks for the link. It's interresting that the MPE gain is not as strong on the Quadro as one "might" have expected. Fascinating actually!
You might want to read this:
Samsung Desktop drives do not have this feature that I know of just like WD Desktop drives do not have TLER.