I think the conventional wisdom is that a fast Core 2 duo will get you better results than a slower quad core.
The processor dosent make two hoots, to the difference in quality.
Its a software program. Its follows rules, The only difference will be in speed in getting the results.
If you apply an effect in photoshop say unsharp mask, then on the latest p4 quad core 4 gig ram ultra fast hdd, ect,ect then the time to get the results will be say 10 secs.
If the same version of photoshop running on an old pentium 2 100Mh, will give you exactly the same results, ok it might take you 5 hours to get exactly the same result, but the result will be the same. it has to be, its following the same rules to generate the unsharp mask.
Think about it. Every one here will have a different set up, memory, HDD space, Processor, Mac or PC,ect the filter effect must do the same on every machine, Yes if you have a quad core over a dual core then there will be math routines inside photoshop that will use the extra processing power of the quad core, but the results have to be the same. If it produces different results on different setups how can you possible use the program?
Last week the results i was getting were fantastic, this week i added 1 gig of more memory and the results are now totally different.
Nope. the results are the same, it took less time to get the results.