Given that Mari stores temporary files on the hard drive, does having something awesome like a 500gb SSD improve Mari's performance? I'm really interested in finding out!
A lot. 1st thing to take care of for Mari. Then the video card (obviously) the most raw power the better, then the vram, but only if you're working on big projects (like 100+ 4096 Udims). I never tried the GTX 980ti in production but having a titan Z back in the day was a god send compared to the quadro k5200 I have right now (even tho I have more vram this thing is way slower) so I imagine this card would be even better (faster with 6gigs of ram). Obviously a titanX would be my choice now but then again, if you are working on game assets 4 to 6 gigs of vram would more than enough.
Then the ram last, which can help depending on how big is your geometry, the number of channels and layers, if you have objects versions and so on.
I have 32 at work and it happened that my ram was maxed out on very big assets (talking about 18M polys objects separated in 5 parts, with 4 channels, each ones compromised of average 100 udims, so that's giving you an idea). Just allow mari to use almost but not quite all the vram and ram in the preferences.
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Then the ram last, which can help depending on how big is your geometry, the number of channels and layers, if you have objects versions and so on.
I have 32 at work and it happened that my ram was maxed out on very big assets (talking about 18M polys objects separated in 5 parts, with 4 channels, each ones compromised of average 100 udims, so that's giving you an idea). Just allow mari to use almost but not quite all the vram and ram in the preferences.