1st, to go over 16gig of ram you need Win7 64bit Pro, not Home (Win8 is still new, so I would not recommend that OS)
2nd, go to the CS5 Benchmark http://ppbm5.com/ and view the results to see what is fast -vs- what is not fast
3rd, read these previous discussions of builds
-more build ideas http://ppbm6.com/Planning.html
-Build it Yourself http://forums.adobe.com/thread/815798
I think it's time for new.
New CPU, which means a new motherboard and memory.
New graphics card, which combined with the above also means a new power supply.
You might be able to get away with the same disks.
I've been using Windows 8 with CS6 for about three months now with no issues. Personally if I were to build today, it'd be using Windows 8 Pro.
John, Please update your link about Planning ... to Planning & Building a NLE System This system is now (almost) finished, has a score of 119 seconds in the PPBM5 benchmark and is the clear #1 among the CS6 systems. Gary from Videoguys posted a link on his blog: Videoguys Blog about this system. Only the final tuning needs to be done and the tuning page to be written/documented.
Done... things change fairly fast around here, so I'm always happy to post the newest ideas
I second Jim's recommendation to just get a new system at this point. This is because unless overclocked, that Q9550 is slower in overall performance in CS5 or above than even a dual-core Sandy Bridge i3-based PC (based on my own testing with CS5.5 and a GT 240 GPU in both a Q9450 and an i3-2100). What's more, even when overclocked to its maximum stable clock speed, your Q9550 will never perform anywhere near as fast in Premiere Pro as even a mediocre quad-core Sandy Bridge i5 CPU-based PC like my i5-2400 backup PC.
And no, upgrading to CS5.5 or CS6 will not solve your problems because you have a CPU platform that's quite a bit outdated and uses older-tech RAM that no current or future system will ever use. And as I have shown, CS5.5 needs 16GB to run at its best while CS6 needs 24GB or more for optimal performance. 8GB of RAM (the amount that your current system has, and the maximum amount of RAM that your motherboard officially supports) just isn't enough to run CS5.5 or CS6 to an editing enthusiast's satisfaction, especially on an older system that's relatively sluggish in performance by present-day standards.
Thanks for all the replies. It is done. I have just ordered the last component for the new PC. A new Sandy bridge processor the same day Hurricane Sandy hit the east coast. Coincidence?