Peripheral Component Interconnect Express (PCIe)
1-bit serial bus called lanes
Up to 32 independent serial lanes
250 MBps throughput per lane (8 GBps for 32x)
Connects directly to the northbridge like AGP
PCIe 2.0 doubles the throughput
Peripheral Component Interconnect (PCI)
Accelerated Graphics Port (AGP)
Used exclusively for graphics cards
32-bit wide data bus
AGP bus connects to the northbridge
Up to 2.1 GBps throughput (AGP 8x)
Multipliers enable AGP devices to operate between bus clock cycles
Used multiplier settings of 1x, 2x, 4x, 8x
3.3V, 1.5V, 0.8V depending on AGP revision
Slots are typically brown
Extended Industry Standard Architecture (EISA)
Industry Standard Architecture (ISA)
Micro Channel Architecture (MCA)
Audio/Modem Riser (AMR)
Communications and Network Riser (CNR)
A special expansion slot for modems and network interface cards
Found on some older ATX boards but not new ones
Still found on some microATX boards