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Κυριακή, 30 Μαρτίου 2008

The Speed of Things

This is just some notes relating to the relative speeds of different parts of a PC and things that connect to a typical PC. It might be useful to give people an idea of what the bottleneck is in their system and whether, for example, that gigabit network card will really give them any performance improvement considering that their hard-drive will never be able to read/write data fast enough to utilise its bandwidth.

Corrections, updates and comments welcome - these results have been culled from all over and may well contain errors. I've tried to keep everything in MB/sec (MegaBytes per second to clarify any potential confusion), where the original rate of something was quoted in Megabits per sec (Mbps), I've gone and divided it by 8.

I expect to clean up the formatting of this over time. Contributions are welcome, particularly details of PC Memory, Memory buses and Systems buses.

ISA ( 8-bit @ 8.3 MHz) = 7.9 MB/sec
ISA ( 16-bit @ 8.3 MHz) = 15.9 MB/sec

Vesa Local (VL) bus 1 (32-bit @ 33 MHz) = 66 MB/sec
(burst) = 128 MB/sec

standard PCI (32 bit @ 33MHz) = 133MB/sec
PCI 2.1 ( 32 bit @ 66MHz) = 266 MB/sec
( 64 bit @ 66MHz) = 532 MB/sec
PCI-X ( 64 bit @ 66MHz) = 532 MB/sec
( 64 bit @ 133MHz) = 1000 MB/sec
PCI-X ( 64 bit @ 266MHz) = 2100 MB/sec
( 64 bit @ 533MHz) = 4260 MB/sec

PCI Express x1 (half duplex) = 250 MB/sec
PCI Express x1 (full duplex) = 500 MB/sec
PCI Express x16 (video cards) = 8000 /sec

SCSI Asych transfer = 1.5 MB/sec
Sync transfer = 5 MB/sec
SCSI2 sync speed = 10 MB/sec
Ultra SCSI = 20 MB/sec
Ultra Wide SCSI = 40 MB/sec
Ultra 2 Wide SCSI = 80 MB/sec
Ultra 160 SCSI = 160 MB/sec
Ultra 320 SCSI = 320 MB/sec
SAS = 375 MB/sec

FC-AL copper/optical (half-duplex) = 200 MB/sec
FC-AL copper/optical (full-duplex) = 400 MB/sec
Fibre Channel over copper cable = 400 MB/sec
Fibre Channel over fiber = 2000 MB/sec
Infiniband 12X Quad-rate = 12000 MB/sec

IDE
PIO Mode 0 (Any) = 3.3 MB/sec
PIO Mode 1 (Any) = 5.2 MB/sec
PIO Mode 2 (Any) = 8.3 MB/sec
PIO Mode 3 (ATA-2, Fast ATA, Fast ATA-2, ATA-3, ATAPI, Ultra ATA, EIDE) = 11.1 MB/sec
PIO Mode 4 (ATA-2, Fast ATA, Fast ATA-2, ATA-3, ATAPI, Ultra ATA, EIDE) = 16.6 MB/sec
DMA Single Word Mode 0 (ATA) = 2.1 MB/sec
DMA Single Word Mode 1 (ATA) = 4.2 MB/sec
DMA Single Word Mode 2 (ATA) = 8.3 MB/sec
DMA Multiword Mode 0 (ATA) = 4.2 MB/sec
DMA Multiword Mode 1 (ATA-2) = 13.3 MB/sec
DMA Multiword Mode 2 (ATA-2) = 16.7 MB/sec
Ultra DMA Mode 0 (ATA/ATAPI-4) = 16.7 MB/sec
Ultra DMA Mode 1 (ATA/ATAPI-4) = 25.0 MB/sec
Ultra DMA Mode 2 (ATA/ATAPI-4) = 33.3 MB/sec
Ultra DMA Mode 3 (ATA/ATAPI-5) = 44.4 MB/sec
Ultra DMA Mode 4 (ATA/ATAPI-5) = 66.7 MB/sec
PATA 133 = 133 MB/sec

SATA = 150 MB/sec
SATA-2 = 375 MB/sec
eSATA = 375 MB/sec

FireWire 400 (IEEE 1394-1995) S100 = 12,3 MB/sec
FireWire 400 (IEEE 1394-1995) S200 = 24,6 MB/sec
FireWire 400 (IEEE 1394-1995) S400 = 49,2 MB/sec
Enhancements (IEEE 1394a-2000) = 49,2 MB/sec
FireWire 800 (IEEE 1394b-2002) = 98,3 MB/sec
FireWire S800T (IEEE 1394c-2006) = 98,3 MB/sec
Firewire S3200 (name not yet set) = 393 MB/sec


USB 1.0 = 0.2 MB/sec (approx.)
USB 1.1 (aka Full Speed USB) = 1.5 MB/sec (approx.)
USB 2.0 (aka High Speed USB) = 60 MB/sec (approx.)
USB 3.0 = 480 MB/sec

Orig Parallel Port = 0.001 MB/sec
EPP = 2 MB/sec
Serial Port = 0.028 MB/sec

AGP (66 MHz) = 266 MB/sec
AGP 2x (133 MHz) = 533 MB/sec
AGP 4x (266 Mhz) = 1066 MB/sec
AGP 8x (533 MHz) = 2133 MB/sec

Gigabit Ethernet = 125 MB/sec
100 Mbps Fast Ethernet (100BASE-T) = 12.5 MB/sec
10 Mbps Ethernet (10BASE-T) = 1.25 MB/sec
56k Modem = 0.007 MB/sec
28k Modem = 0.004 MB/sec
460 Kbps Cable Modem = 0.057 MB/sec
512 Kbps DSL Line = 0.064 MB/sec

802.11b (11 Mbps) = 1,37 MB/sec (~38 m Range Indoor and ~140 m Range (Radius Outdoor) Loss includes one wall)
802.11a (54 Mbps) = 6,75 MB/sec (~35 m Range Indoor and ~120 m Range (Radius Outdoor) Loss includes one wall)
802.11g (54 Mbps) = 6,75 MB/sec (~38 m Range Indoor and ~140 m Range (Radius Outdoor) Loss includes one wall)
802.11n (248 Mbps) = 31 MB/sec (~70 m Range Indoor and ~250 m Range (Radius Outdoor) Loss includes one wall)
802.11y (54 Mbps) = 6,75 MB/sec (~50 m Range Indoor and ~5000 m Range (Radius Outdoor) Loss includes one wall)
Bluetooth (full duplex??) = 0.12 MB/sec
Bluetooth 2.0 + EDR (Max. 3 Mbit/s) = 0,37 MB/sec (1 m–100 m, depending on output)
Wireless USB (rev. 1.0, 480 Mbit/s) = 60 MB/sec (3 m)
Wireless USB (rev. 1.0, 110 Mbit/s) = 13,75 MB/sec (10 m)

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