Does anyone know if the 15" Macbook Pro (late 2013 or mid 2014) with integrated Iris Pro graphics support 60Hz single stream transport mode on the newer 4k monitors? I haven't been able to find a clear answer. People with the 15" Macbook Pro with the discrete Nvidia 750M graphics are reporting that their machines support 60Hz SST while the 13" Macbook Pro with Iris integrated graphics does NOT support 60Hz SST but I haven't been able find any reports or tests with the 15" Macbook Pro with Iris Pro and 60Hz SST. Apple's support document on 4k monitor support was prepared when 4k monitors with SST only supported 30Hz and it hasn't revised yet to address the newer monitors that support 60Hz SST. I may purchase a 15" Macbook Pro soon and frankly, I'd like to say some money but I don't want to go with the 15" Macbook Pro Iris Pro model if it doesn't support 60Hz SST with 4k monitors. Thanks in advance for any light you might be able to shed.