Wasn't sure where to put this as it isn't necessarily Mac related, but I was wondering if anyone could give me some tips on where to start on this. Here is a crude representation of my home's network topology (not to scale, especially locationwise): The router is a SMC router, 802.11n and Gigabit Ethernet. (Router and modem side of the wall are actually downstairs; the ISP's installer would not bring the line in upstairs, so the router had to be down). All of the cabling in wall is CAT6, and all of the short cables between devices and the wall are either CAT6 or CAT5e. My understanding is that both work fine for Gigabit Ethernet. Everything is set to Auto everywhere on both the router and the PC. PC is Gigabit (this is my motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131025 ) I omitted my MacBook (original 2 GHz Core Duo, white) from this, but it's normally connecting over WiFi. Same for iPad, iPhone, 3DS, Wii, printer, and other such devices. When I check Control Panel\Network and Internet\Network Connections (PC is running Windows 7; was a Hackintosh running Snow Leopard in the past, before a HDD failure, my first ever with a Western Digital), it shows that it is connected at 100 mbps. When I manually force the PC to 1000 mbps, it loses connectivity. The SMC Admin page on the router is set to auto. The switch (which is also SMC), I don't know if there is a way to configure. It's gigabit, but I don't believe it gets an IP address and don't what if any configurations there would be to change. I've got all of my media ripped and stream with Air Video (to my iPad) and PS3 Media Server (to my PS3/HDTV), including some 1080p video. I'm not sure if the performance bottleneck is my CPU or the network, but some 1080p movies stream poorly and get choppy across the network. I also intend to set up a NAS on the network, in which case gigabit speeds will matter a lot more. How can I get gigabit speeds on this PC? Does anyone have any suggestions on where I can start troubleshooting?