The CPU and RAM, yes, arte critical. After all, trying to pair a Titan X, with a Core 2 Quad, is both useless and stupid. Anything older than a second generation iCore CPU (Or AMD equal) should be considered obsolete, especially when it comes to rendering, and, anything slower than DDR3 as well. The SSD, on the other hand, is indeed a benefit, but it's not a "game breaker". Render assets first load to the system RAM, before they are dumped into the VRAM, for the render process, the SSD will only help in reading the files before loading to RAM.