COMPARISON TABLE - connection type in MegaBytes per second -theroretical maximums, from slowest to fastest    table from "List of device bandwidths (d-silence.com)",
used w/out permission, but attributed
connection hardware theoretical maximum rate, in MB/s* Notes (inc. other values)
Modem 28.8k 0.00375  
Modem 56.0k 0.0075  
IrDA-Control 0.009  
Serial 0.020  
Bluetooth 1.1 0.125  
Thin Ethernet 0.125  
DS1/T1 0.1925  
Frame Relay 0.193  
SDSL 0.2875  
ADSL 0.768  
Parallel 1.00  
Fast Ethernet (100-BaseX) 1.25  
USB 1.1 1.50  
SCSI 1 5.00  
DS3/T3 5.59  
OC1 6.48  
Fast SCSI 2 10.00  
Bluetooth 2 12.00 from 2 MB/s to 12 MB/s
Gigabite Eithernet (1000-BaseT) 14.38  
OC3 19.44  
Fast Wide SCSI 2 20.00  
Ultra DMA ATA 33 (ATA-33) 33.00  
Ultra Wide SCSI 40 40.00  
FireWire (IEEE 1394) 50 50.00  
USB 2.0 60.00  
Ultra DMA ATA 66 66.00  
OC12 77.76  
Ultra2 SCSI 80 80.00  
FireWire (IEEE 1394b) 100.00  
Ultra DMA ATA 100 (ATA-100) 100.00  
Ultra DMA ATA 133 (ATA-133) 133.00  
PCI 133.00  
Serial ATA (SATA v1) 150.00 commonly listed as "SATA 1.5 Gb/s" Note:
Maximum is 80% of 187.5 MB/s (i.e. 150 MB/s). [1]
Ultra 160 SCSI 160.00  
HyperTransport 200.00 200 MB/s per line or 6.4 GB/s for full-sized 32-bit bus
AGP 1x 266.00  
Serial ATA (SATA v2) 300.00 commonly listed as "SATA 3.0 Gb/s"; see "serial ata GB/s theoretical"
OC48 306.00  
PCI-Express
(aka 3GIO)
500.00  
AGP 2x 532.00  
PCI v2.2 533.00  
Ultra640 Scsi 640.00  
Lightning Data Transport (TM) 800.00  
Fiber Channel 1000.00  
AGP 4x 1064.00  
PCI-Express 133 (PCI-x 133) 1066.00 PCI-X 133
133 MHz
64 bit
x1 data per cycle
1,066 MB/s
OC192 1280.00 1.25 GB/s
InfiniBand 1280.00 1.25 GB/s
OC255 1690.88 1.65125 GB/s
AGP 8x 2128.00  
PCI-Express 133: Theoretical Double Data Rate ( DDR) 2133.00  
OC768 5120.00 5 GB/s
  2133.00
* "MB/s" = MegaBytes per second; 1 MB (one MegaByte) = 1,024 KB (KiloBytes) = 1,048,576 Bytes = 8,388,608 bits =~ one million Bytes