I'm in a bit of a pickle here. I've been limping along on a maxed-out late 2012 iMac for a while now, and it's just not keeping up with the intensity of the raw-based projects I'm colour grading at the moment. Constant crashes, running out of GPU memory (with the 2GB GTX680 internal card) it's simply costing me more time in issues than it's worth.
ProRes and FCPX are both still big parts of my work, so moving over to a PC (as much as I'd like to at this stage) isn't an option.
I've never been a fan of the trashcan. But started considering it recently because I'm getting desperate. But the dual-D700 cards have too many issues with Davinci Resolve for it to be a viable option for me.
So now I'm looking backwards.
I'm wondering how well a maxed-out 5,1 Mac Pro tower might hold up for 5k-6k Redcode, 2.8k Arriraw and 4k Sonyraw material. I'm thinking the twelve-core (or is it dual 6-cores?) 3.46Ghz processor, A flashed 12Gb maxwell Titan X, 128GB RAM, PCI-based SSD for the boot drive, a Blackmagic Decklink Mini Monitor (for my reference monitor) and a 4-port USB3.0 Card (to make it all usable in 2017)?
What sort of performance bottlenecks am I likely to face with the older machine?
I've also found some units for sale, that say they're 4,1 Mac Pros, upgraded to 5,1. Is there any difference between an upgraded 4,1 and a genuine 5,1 that I'd need to worry about? (I'm mainly just concerned about potential hardware bottlenecks between the two).
Any help would be GREATLY appreciated. I'm really struggling here, and need a machine that's up to the task. Slower rendering/processing speeds compared to new machines isn't my biggest concern either, it's having a machine that's powerful and stable enough the slog through the heavy workloads of raw projects without crashing - so I don't mind it chugging through things slower, so long as it keeps chugging at all times.
The other alternative I'm considering is jury-rigging a Maxwell Titan X on to the iMac as an eGPU (using an Akitio Node, and a TB3 to TB2 converter). Though I'm not sure if that'd offer as much performance as the older Mac Pro.