Which current Mac Pro for Aperture/Photoshop

Question

After much research and what seems to be chasing my tail, I though I'd ask the forum for some advice on which machine will best suit my needs. I am currently running Aperture and Photoshop CS3 and looking for a fast machine for the job. I sort through around 2500-3000 raw files per week and hope the new Intel Xeons will speed up my workflow. It's the question of "How many cores are better?" that's confusing me as I am unclear on how many Aperture and Photoshop can actually make use of.
I'm looking to upgrade from my 3.06 iMac to a Mac Pro but having trouble choosing between a new 2.66 quad or a refurbished 2.26 8-core. I understand the drop in processor speed might be noticeable in some instances but the from what I have gathered an upgrade to the ATI HD 4870 is a must as is 6GB ram on the 2.66 and 8GB ram on the 2.26. It's not so much the price difference of the two machines (£2200 for the upgraded 2.66 and roughly £2700 for a refurbished 2.26 plus upgrades) it's will my workflow see any great benefits from the 8-core over the quad. The program I use most is Aperture, followed by Photoshop then FotoMagico, iDVD and Toast Titanium. Does Snow Leopard affect the use of cores in these programs?
Any feedback is much appreciated or pointing in the direction of some real world tests as all the bench tests of the 8-core are so impressive but I'll not be using it for 3D/Video at all.
Thanks in advance for your help.

Answer 1

According to the Adobe blog the delay in offering a 64-bit suite for Mac is because the entire suite has to be rewritten in Cocoa (both previous and current offerings are written in Carbon) CS5 will be written in Cocoa and will utilise the full functionality of the Snow Leopard OS (OpenGL, GCD etc) so memory addressing will be a huge step forward on Photoshop (which I use).
I used Photoshop CS4 on a 2008 Mac Pro 2 x 2.8GHz 8 core (dual Xeon 5400 series Quad core CPUs) and just recently switched to a 2009 Mac Pro 2 x 2.26GHz 8 core (Xeon 5500 series Quad core CPUs). I used CS3 on the original Mac Pro 2 x 2.66Ghz (Dual Xeon Dual Core CPUs = 4 cores total). It's not a fair reflection as CS3 ran under Rosetta on the original Mac Pro and CS4 has better integration on the Intel based Macs, but in general, I noticed a much better rate of workflow on the 8 core machines over the 4 core machine.
More importantly, I would point out that running batch process of RAW files in CaptureOne Pro was significantly performing the batch process on the 8 core machines than on the 4 core machine. (250 RAW files {with no corrections] from a Canon EOS 1D MKII into 16-bitt TIFF files). I can't remember the exact figures but the 8 core machines were @ 23 - 25 minutes quicker than the 4 core machine.
I know it's not scientific and software versions were different which could add to the different results in part, but the 8 core machines both out performed the 4 core machine substantially.
However, the 2009 Mac Pro Quad Core is capable of running 2 threads per core (in effect a virtual 8 core machine and as many reviewers have pointed out, perform faster than the 8 core Mac Pro in certain applications (which have not been written to utilise the full multi-CPU-multi-core environment.
The Memory limitation on the Quad Core is 16GB RAM (Apple state 8GB but reviewers have installed 4 x 4GB DIMMs into the Quad Core without issue). Unless you are doing 3D or HD rendering etc you probably won't really need over 16GBs of RAM, however the cost of 4GB memory sticks is expensive. Crucial only offer a 12GB kit for the Quad Core Mac Pro 2009 to make full use of the triple channel memory speeds (DDR3 best performance in multiples of 3) and 12GBs from Crucial is @£771.00 (prices correct at time of writing this. This equates to @ £257 per 4GB.
Total for Quad Mac Pro with 12GB (3 x 4GB RAM) = £2670
Total for Octo Core Mac Pro with 12GB (6 x 2GB RAM) =£2731 (New price not refurb)
Graphics card upgrade etc will be the same on both machines. Memory based on Crucial Memory prices.
So, for a 2009 Mac Pro with 12GB RAM, it is £61 dearer for an 8 core (virtual 16 cores) machine over the Quad Core Mac Pro. The 8 core system will give you further memory expansion once prices of the 4GB memory sticks come down significantly. The Quad Core will only be able to be upgraded with 8GB RAM sticks over the 4GB sticks available now and will cost a huge amount at time of launch.
Buying a refurbishment 2.26 GHz with similar memory upgrade would in my opinion be the way to go. I know the CPU clock speed is lower, but in real time non memory intensive applications the difference will be hardly noticeable.
I went through the same dilemma as you. I opted for the 8 core system with 12GB RAM and the ATI HD4870 graphics (bought as an upgrade kit so was dearer than the build to order option). I am very happy with my purchase.
The other option is to check out eBay there may be a very well spec'd 2008 Mac Pro for sale with warranty, 16GB RAM and the 8800GT graphics card for less than either of the new systems.
Over the long term, the 8 core offers more affordable customisation options over the Quad Core, but it depends on how long you plan to use the machine