These values are not calculated very accurately. I just assume that 1 byte needs 10 bits for transport including some control bits. Some methods may use more control bits, while some use less. Only for your reference and practical purpose. Please do not put any weigh on a penny MB :)
- SATA3: 550 MB/s (= 6 Gb/s)
- SATA2: 270 MB/s (= 3 Gb/s)
- USB3.0: 400 MB/s (= 5 Gb/s)
- USB2.0: 35 MB/s (= 480 Mb/s)
- Sasmung SSD 840 basic: 530 / 200 MB/s
- 5400 rpm HDD: 85 MB/s
- Samsung SDHC UHS1 Plus: 48 / 20 MB/s
- Samsung SDHC UHS1 Pro: 70 / 20 MB/s
- Samsung SDHC Class10: 24 / 21 MB/s
- Mobile phone file transfer: 20 MB/s
- Gigabit Ethernet: 100MB/s (= 1 Gbps)
- Wifi n: 30 MB/s (= 300 Mbps)
- Wifi g: 5 MB/s (= 54 Mbps)
- Highspeed-internet: 10 MB/s (= 100 Mbps)
- ADSL2+: 0.8 MB/s (= 10 Mbps)
- LTE Single: 1.5 MB/s (= 15 Mbps)
- 3G+ : 0.5 MB/s (= 5 Mbps)
- Bluetooth 2.0 EDR: 0.2 MB/s (= 2.1 Mbps)
- Bluetooth 3.0 HS: 2 MB/s (= 24 Mbps)
- HDMI v1.2(1080p): 400 MB/s (= 4 Gbps)
- HDMI v1.3: 800 MB/s (= 8 Gbps)
First of all, if you want to use the recent SSD for your laptop or desktop, you'd better to have SATA3 interface in your computer. SATA2 doesn't support the full speed of new SSD.
Similarly, your external HDD is fully functional when you connect it with USB 3.0 port, if the HDD supports USB 3.0 interface.
UHS1 class SDHC cards should be inserted to USB 3.0 compatible card reader with USB 3.0 port, while Class 10 doesn't seem to need USB 3.0 support.
Mobile phones still support only USB 2.0, thus there's little difference between using wifi N and USB cable (30 vs 35) when you transfer transfer files from your mobile to PC. However, if either your mobile or your computer doesn't support wifi N, definitely you'd better to use USB since wifi G provides maximum 5 MB/s, while you can get 30 MB/s when you use USB cable.
If you don't share any files using your home network, and just use low speed internet, such as ADSL, you don't actually need wifi N or Gigabit Ethernet.
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