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Flashcards by Jessica Rizo, updated more than 1 year ago
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| Question | Answer |
| What is a Bus? | Buses are ways for som parts of the motherboard to communicate to each other. |
| What is an expansion bus? | Allows for communication of an expansion card to the expansion slot |
| What is most important about expansion buses today in terms of throughput? | Just look for the size and type of bus to know how much bandwidth it can support. |
| What are PCI slots? | Peripheral Component Interconnect Supports 32bit/64bit parallel communication Slots usually indicate what cards they support (either 3.3v or 5v) Larger slots usually support 64bit Smaller slots usually support 32bit |
| What are the throughputs of the buses of the PCI slots? | 32bit at 33MHz—133MB/s 32bit at 66MHz & 64bit at 33MHz—266MB/s 64bit at 66MHz—533MB/s |
| What does parallel communication mean? | Legacy way of communication where 8 bits of data are sent at once through careful synchronization via many lines. |
| What are PCIe slots? | Peripheral Component Interconnect extended Communicates serially |
| What does serial communication mean? (Synchronous) | Data is sent over data lines with a clock signal which makes for faster communication |
| How do PCIe slots work? | PCIe slots communicate serially using instead of lines, “lanes” which are full duplex (sends & receives at the same time) A pair of lanes (one sending,one receiving) is considered only one lane This full duplex capability is also called bidirectional communication |
| List up to how many lanes a PCIe can have | PCIe x 1 PCIe x 2 PCIe x 4 PCIe x 8 PCIe x 16 PCIe x 32 |
| What are the versions of PCIe and their throughputs? | v1.x—250MB/s v2.x—500MB/s v3.0—approx. 1GB/s v4.0—approx. 2GB/s v5.0—approx. 4GB/s *note: the throughput is for each direction in a single lane. |
| What would be the throughput of a v1.x PCIe x 1 slot? | v1.x—250MB/s for each direction PCIe x 1 has 1 lane communicating bidirectional Therefore total communication is 2 2 x 250MB/s=500MB/s throughput |
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