I made these charts to demonstrate the amount of GPU power it takes to load massive MIDI files onto MIDITrail. Here I have a GTX 550Ti, a GTX 750Ti, and a GTX 760.
GeForce 550Ti, 1GB
GeForce 750Ti, 2GB
GeForce 760, 4GB
For the CPU, I was using an Intel Core i7 4790k @4.00GHz which turbo boost to 4.4GHz under single-core heavy load. These bar graphs show that the graphics cards with the most ram were able to maintain a much higher framerate with larger MIDI files.
Over time, I will be adding more sets of graphics card's benchmarks on MIDITrail to these same MIDIs used, with the same processor.