Adobe Camera Raw - CPU or RAM?

Hey All!
Please read the whole post, but if you want to cut to the chase, my question is: for ACR conversions would I be better off with an (Windows) 8-core system and 6gigs of ram, or a 4-core system and 12 gigs of ram?
I am a professional photographer who, after upgrading to some equipment that spits out serious file sizes, needs to upgrade his computer system. I shoot almost exclusively RAW and I rely primarily on Adobe Camera Raw to convert my files and open them in photoshop. While photoshop performance is a consideration, my biggest concern is to be able to open ACR images ridiculously quick.
Right now, working off 21 megapixel images on my current system, it takes between 10 - 20 seconds to open/convert a single file into photoshop. I'm aiming for a couple of seconds.
My current system (please don't laugh ... I know its bad):
XP 32-Bit
dual-core 2.00GHz
3G DDR2 Ram (with 3G switch enabled)
5400 rpm Hard Drives
Running CS4 and ACR 5.3
Future Set Up Considerations:
Vista 64-Bit
Processor/RAM
a) quad-core-Q9600 3.00 GHz with 8 gigs DDR2 (1150MHz)
b) i7-920 2.66 GHz with 12 gigs of DDR3 (1600 MHz) - adds about $500 to price - worth it?
c) 2 Xeon-quad-core-5530 2.40 GHz with 6gigs DDR3 (1600Mhz) - adds about $1000 to price - worth it?
d) something AMD?!?!
Hard Drives (7200rpm)
2 for images storage (one as an internal backup)
1 For operating system, applications, music, etc
1 For scratch disk
Basically, the question comes down to whether extra cores or extra ram will ultimately make the biggest difference in the ACR performance
During my testing on my (sad) currently system, here are my conclusions (let me know what you think):
Changing the 3G switch to allow the jump from 2 to 3 gigs of ram usage for applications makes no difference in performance
When I am opening up ACR files both cores show 100% usage (will that continue over 4 or 8 cores?)
Photoshop in general seems to be more CPU limited in my case than ram limited (most of the time is says 100% efficiency but things still take bloody long
From some more experienced users, or users who have quad or octa core system or systems with insane amount of ram, I woudl really appreciate your feedback!
Thanks for the long read!
~
Justin

Hey Zeno!
Thanks for the reply.
I would have to disagree thought that it is hard drive limited at this moment. Take a look at my task manager:
It was running about 5% before I started converting pictures, and then as soon as I started converting the pictures, both cores hit 100% (with little gaps between pictures), and then back to 5% after they were done. You can also see the ram alocation being increased with each picture that is opened.
So basically, I am wondering if going to a quad core will have all 4 CPU's hit 100%, thus coming close to doubling the speed. Or if I go i7 then with hyper threading it'll go to 8 effective cores. Or if I go to dual Xeon processors I'd have 8 cores and with hyperthreading effectively 16 cores.
I am wondering if anyone has experience with a quad core or octacore system that might be able to share some insight.
But I would agree that probably for now 6Gs of ram is probably plenty.
I also don't understand when you said:
"same goes with the CPU, the more cores you have the less benefit you get out of adding more of them"
Could you elaborate. Its just that it takes about 15-20 seconds to convert a single file, and space that out even over 50 photos, that is still 15 minutes of wasted time. Just trying to get the best I can without wasting needlessly.
Thanks a ton!
~
Justin

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http://forums.adobe.com/thread/419981?tstart=0
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