Yep, 100G switches are common nowadays since the cost has come down so much, and you can easily carve a port to 4x10G, 4x25G, and 40G. In financial trading you tend to avoid switches with huge buffer as that comes to a huge cost in latency. For example, 2 megabytes of buffer is 1.68ms of latency on a 10G switch which is an eon in trading. Most opt for cut-through switches with shallow buffers measured in 100s of nanoseconds. If you want to get really crazy there are L1 switches that can do 5ns.