Expansion Slots

Question 1

Expansion Slots & Bus Speeds

Answer 1

• Communication path
  
  • A city of technology
• Internal PC growth
  
  • Independent pathway
• System expansion
  
  • Additional capabilities

Question 2

The Expansion Bus

Answer 2

-“Width” in bits = Width is changing to bandwidth

• Clockspeed of the bus (Expansion gets it own clock)
  
  • 1Mhz = 1 million cycles per second
  • 1Ghz = 1000Mhz
• Clockspeed doesn’t necessarily equal transfer rate
  
  • DDR3 SDRAM does 64x memory clockspeed

Question 3

Conventional PCI

Peripheral Component Interconnect

Answer 3

• Peripheral component interconnect
  
  • Created in 1994
• Common expansion interface
  
  • 32bit & 64bit
  • Parallel communication
• Throughput =
  
  • 133MB/s (32bit @ 33Mhz)
  • 266MB/s (32bit @ 66Mhz)
  • 533MB/s (64bit @ 66Mhz)

Question 4

PCI - X

Peripheral Component Interface eXtended

Answer 4

-Designed for servers

• Higher bandwidth
  
  • Four times the clockspeed
  • Built to handle higher speed network & storage
  • 1064MB/s throughput
  • Parallel communication

Question 5

PCIe

Peripheral Component Interface Express

Answer 5

-Replace, PCI, PCI-X, & AGP (Accelerated Graphics Port)

• Communicates serially (Unidirectional lanes)
  
  • Slower devices doesn’t slow everyone

-x1, x2, x4, x8, x16, x32 duplex lanes.

Question 6

PCI Express Throughput

PCIe

Answer 6

-Different versions of PCIe

• Per lane throughput each direction
  
  • V1 x = 250MB/s
  • V2 x = 500MB/s
  • V3.0 = 1GB/s
  • V4.0 = 2GB/s

Question 7

Mini PCI & Express Mini Card

Answer 7

• Mini PCI & PCI Express for laptops
  - Shrunk down for mobile use
• Expand features of laptops
  • Wifi, Hotspot, Etc

-No access to card