Yep. I have achieved over 100MB/s sustained writing from RAM to RAM over gigabit ethernet, and this includes any SAMBA overhead. I have never used pcattcp, but I do use iperf and it confirms that I am getting the full speeds once should expect from gigabit ethernet, even on cheap shitty Realtek chips. My guess is that something else fails in this test. Maybe old wires not good for gigabit, or a shitty switch or something.