Yes, what LukeDJ said, Z68 has no PCIe 3.0 support, and doesn't support USB 3.0 natively, plus Z77 has better support for Ivy Bridge CPUs. Higher speed RAM will make absolutely no difference while gaming, only noticeable in benchmarks, so unless it's for "bragging rights", put the money in something else, like a liquid cooler for overclocking your CPU (usually good for a few frames per second).