Computer Hardware: Memory, Expansion, Storage, and I/O Interfaces

Comprehensive review flashcards covering RAM technologies, memory modules, cache and error checking, motherboard expansion slots, storage drive interfaces, optical media, and peripheral ports.

What is Synchronous Dynamic RAM (SDRAM) and how does it function?

SDRAM is DRAM that operates in synchronization with the memory bus, achieves higher transfer rates, and can process overlapping instructions in parallel, such as processing a read before a write has been completed.

What are the primary operational characteristics, pin count, and standard voltage of DDR SDRAM?

DDR SDRAM transfers data twice as fast as SDRAM, supports two writes and two reads per CPU clock cycle, utilizes a connector with $184$ pins and a single notch, and operates at a standard voltage of $2.5\,\text{V}$.

How does DDR2 SDRAM compare to DDR SDRAM in terms of speed, signal integrity, pin count, and voltage?

DDR2 SDRAM transfers data twice as fast as SDRAM, runs at higher clock speeds than DDR ($553\,\text{MHz}$ vs. DDR at $200\,\text{MHz}$), improves performance by decreasing noise and crosstalk between signal wires, has a $240$-pin connector, and uses a standard voltage of $1.8\,\text{V}$.

What are the key technical specifications and advantages of DDR3 SDRAM?

DDR3 SDRAM expands memory bandwidth by doubling the clock rate of DDR2, runs at clock speeds up to $800\,\text{MHz}$, consumes less power than DDR2 ($1.5\,\text{V}$), produces less heat, and uses a $240$-pin connector.

What are the key enhancements and specifications of DDR4 SDRAM compared to DDR3?

DDR4 SDRAM quadruples maximum storage capacity compared to DDR3, operates at clock speeds up to $1600\,\text{MHz}$, consumes less power ($1.2\,\text{V}$), includes advanced error correction features, and uses a $288$-pin connector.

What improvements does DDR5 SDRAM provide over DDR4, and why are they physically incompatible?

DDR5 SDRAM runs at more than double the speed of the fastest DDR4 modules, quadruples maximum storage capacity with module sizes up to $128\,\text{GB}$, and operates at $1.1\,\text{V}$. While it has $288$ pins, it uses a different pin pattern than DDR4, making them incompatible.

What is Graphics Double Data Rate Synchronous Dynamic RAM (GDDR) and what is its workload profile?

GDDR is RAM specifically designed for video graphics used with a dedicated GPU. It processes massive amounts of data (though not necessarily at the fastest speeds), and each successive family member (GDDR through GDDR5) improves performance and lowers power consumption.

What type of individual legacy memory chip packaging is shown in the image, and why was it phased out?

A dual inline package (DIP) chip, which has dual rows of pins used to attach directly to the motherboard; it was difficult to install and frequently became loose, leading designers to solder chips onto circuit boards to create memory modules.

What is a single inline memory module (SIMM) and what pin configurations does it offer?

A SIMM is a small circuit board holding several memory chips that connects to a motherboard slot using either a $30$-pin or a $72$-pin configuration.

What is a dual inline memory module (DIMM) and what are the specific pin counts for SDRAM through DDR4?

A DIMM is a circuit board holding SDRAM through DDR4 chips. The pin configurations are: $168$-pin for SDRAM, $184$-pin for DDR, $240$-pin for DDR2 and DDR3, and $288$-pin for DDR4.

What are small outline DIMMs (SODIMMs), and what pin configurations exist for 32-bit and 64-bit transfers?

SODIMMs are condensed DIMMs designed for space-constrained devices like laptops and printers. They feature $72$-pin and $100$-pin configurations for $32$-bit transfers, and $144$-pin, $200$-pin, $204$-pin, and $260$-pin configurations for $64$-bit transfers.

What is the structural difference between single-sided and double-sided memory modules?

Single-sided memory modules have RAM chips mounted on only one side of the module, whereas double-sided memory modules have RAM chips mounted on both sides.

How do single-channel, dual-channel, triple-channel, and quadruple-channel memory architectures work?

Single-channel RAM addresses all slots at the same time. Dual-channel RAM adds a second channel to access two modules at once. Triple-channel and quadruple-channel technologies add third and fourth channels for higher throughput, requiring supportive chipset architecture and populated slots in a specific order.

What is static RAM (SRAM) and how does its speed compare to dynamic RAM (DRAM)?

SRAM is cache memory that stores the most recently used data and CPU instructions. It is typically the fastest memory in a computer and provides the processor with faster access to data than retrieving it from slower DRAM (main memory).

What are the characteristics and historical locations of L1, L2, and L3 cache memory?

L1 cache is internal cache integrated into the CPU; L2 cache was originally mounted externally on the motherboard near the CPU but is now integrated into the CPU; L3 cache is used on some high-end workstations and server CPUs.

How do nonparity, parity, and ECC memory differ in detecting and correcting memory errors?

Nonparity memory does not check for errors and is typical for home and business workstations; parity memory stores $8$ data bits and $1$ parity bit for error checking; ECC (error-correcting code) memory can detect multiple-bit errors and correct single-bit errors, making it essential for financial and data analytics servers.

What primary functions do adapter cards fulfill in a computer system?

Adapter cards are peripheral hardware placed into expansion slots to increase functionality, improve performance and compatibility, add controllers for specific devices, or replace malfunctioning motherboard ports.

What are the respective functions of a video capture card and a TV tuner card?

A capture card sends video signals to a PC so they can be recorded to a storage drive using video capture software, whereas a TV tuner card allows users to watch and record television signals on a PC by connecting cable, satellite, or an antenna.

What connectivity does an eSATA adapter card add to a computer?

An eSATA card adds additional internal and external SATA ports to a computer through a single PCI Express slot.

What are the specifications of PCI and PCI-X expansion slots?

Standard PCI is a mostly obsolete $32$-bit or $64$-bit expansion slot. PCI-X (PCI-Extended) is an updated version using a $32$-bit bus with higher bandwidth that operates up to $4$ times faster than PCI, though it is also mostly obsolete.

What is Mini PCI and what form factors does it support?

Mini PCI is a compact version of the PCI expansion slot used in some laptops that comes in three form factors: Type I, Type II, and Type III.

What are the four standard lengths and lane options of PCI Express (PCIe)?

PCI Express comes in four sizes/lengths: PCI Express x1, PCI Express x4 (with $4$ data lanes), PCI Express x8 (with $8$ data lanes), and PCI Express x16 (with $16$ data lanes).

What are the data transfer rates for PCIe versions 2, 3, 4, and 5 for x1 and x16 slots?

Version 2: $0.5\,\text{GB/s}$ (x1) and $8\,\text{GB/s}$ (x16); Version 3: $0.985\,\text{GB/s}$ (x1) and $15.754\,\text{GB/s}$ (x16); Version 4: $1.969\,\text{GB/s}$ (x1) and $31.508\,\text{GB/s}$ (x16); Version 5: $3.938\,\text{GB/s}$ (x1) and $63.015\,\text{GB/s}$ (x16).

How does backward compatibility function across PCIe versions?

Every version of PCIe is backward compatible with all other versions, and the speed of the bus is determined by the lowest version component installed.

How much power can a PCIe slot and auxiliary connectors supply?

PCIe can supply up to $25\,\text{W}$ to each standard slot, up to $75\,\text{W}$ for a graphics card slot, and an additional $75\,\text{W}$ via an external PCIe power connector from the power supply.

What is a riser card and why is it used?

A riser card is an adapter board added to a computer to provide additional expansion slots for installing more expansion cards.

What was the Accelerated Graphics Port (AGP) and what has replaced it?

AGP was a dedicated high-speed expansion slot designed specifically for attaching an AGP video card; it has since been superseded by PCI Express.

What does nonvolatile storage mean in the context of computer data drives?

Nonvolatile storage means that data is retained and remains available the next time the drive is powered on, even after power to the device is lost.

What are the maximum transfer speeds of legacy PATA (IDE and EIDE) compared to SATA versions 1, 2, and 3?

IDE transfers up to $8.3\,\text{Mbps}$; EIDE up to $16.6\,\text{Mbps}$; SATA 1 up to $1.5\,\text{Gb/s}$; SATA 2 up to $3.0\,\text{Gb/s}$; and SATA 3 up to $6.0\,\text{Gb/s}$.

What is Small Computer System Interface (SCSI) and what is its modern serial standard?

SCSI is an older motherboard-to-storage interface that originally utilized parallel data transfers; its modern successor is Serial Attached SCSI (SAS), commonly used for server storage.

What are the common spindle speeds and form factors of traditional Hard Disk Drives (HDDs)?

Common HDD spindle speeds are $5400$, $7200$, $10\,000$, and $15\,000\,\text{RPM}$. Standard form factors include $3.5\text{-inch}$ (desktop PCs), $2.5\text{-inch}$ (mobile devices), and legacy $1.8\text{-inch}$ drives.

How does a tape drive store data, and what is its main performance limitation?

A tape drive uses a magnetic read/write head and removable tape cartridge for archiving data; while data retrieval can be fast, locating specific data is slow because the tape must physically wind on a reel until the target data is found.

How do Solid-State Drives (SSDs) store data, and what advantages do they provide over HDDs?

SSDs store data as electrical charges in semiconductor flash memory. Because they have no moving parts, they are faster, produce no noise, consume less power, emit less heat, and offer greater reliability than magnetic HDDs.

What are the three main form factors for Solid-State Drives (SSDs)?

The three form factors are disk drive form factors ($2.5$, $3.5$, or rare $1.8\text{-inch}$ cases), expansion cards (plugging directly into motherboard expansion slots), and mSATA or M.2 modules.

What is Non-Volatile Memory Express (NVMe) and what advantage does it offer for SSDs?

NVMe is a specification providing a standard interface between SSDs, the PCIe bus, and operating systems, allowing compliant SSDs to attach to PCIe without requiring special drivers.

What is a solid-state hybrid drive (SSHD) and how does it function?

An SSHD combines a conventional magnetic HDD with onboard flash memory acting as a nonvolatile cache; it automatically caches frequently accessed data to accelerate operations like OS startup at a lower price than a full SSD.

What are the three primary types of optical discs and their media classifications?

The three types are Compact Disc (CD), Digital Versatile Disc (DVD), and Blu-ray Disc (BD); they can be prerecorded (read-only), recordable (write-once), or rerecordable/rewritable (read and write multiple times).

What are the storage capacities of CD-ROM, DVD, and Blu-ray media in single and dual layers?

CD-ROM has a capacity of $700\,\text{MB}$; DVDs hold $4.7\,\text{GB}$ (single layer) and $8.5\,\text{GB}$ (dual layer); Blu-ray Discs hold $25\,\text{GB}$ (single layer) and $50\,\text{GB}$ (dual layer).

What is the functional difference between BD-R and BD-RE optical media?

BD-R is recordable Blu-ray media that can be recorded one time, whereas BD-RE is rewritable Blu-ray media that can be recorded, erased, and rerecorded multiple times.

What video connector is shown in the image, and what are the functional differences among DVI-D, DVI-A, and DVI-I?

This is a Digital Visual Interface (DVI) connector. DVI-D supports only digital devices and outputs, DVI-A supports only analog outputs, and DVI-I supports both digital and analog signals.

What interface port and cable are shown in the image, and what is its primary design purpose?

This is DisplayPort, an interface technology designed to connect high-end graphics-capable PCs and displays, as well as home theater equipment and displays.

What audio/video interface connector is shown in the image, and why was it adopted for computers?

This is a High-Definition Multimedia Interface (HDMI) connector. It was developed specifically for high-definition televisions, but its digital capabilities make it well-suited for connecting computers to displays.

What are the capabilities of Thunderbolt 1 and 2, and what protocol do they use for high-definition video?

Thunderbolt 1 and 2 allow high-speed connection of peripherals such as hard drives, RAID arrays, and network interfaces, and they transmit high-definition video using the DisplayPort protocol.

How does Thunderbolt 3 differ from Thunderbolt 2 in terms of connector type, bandwidth, power, and display capabilities?

Thunderbolt 3 uses the USB-C connector form factor, offers twice the bandwidth of Thunderbolt 2, consumes less power, and can provide video output for up to two $4\text{K}$ monitors.

What legacy analog video port and connector is shown in the image, and what are its physical pin specifications?

This is a Video Graphics Array (VGA) connector (also called DE-15 or HD-15), which carries analog video signals across $15$ pins arranged in $3$ rows.

What connector type is shown in the image, and how are its colors assigned for composite audio/video?

This is a Radio Corporation of America (RCA) connector featuring a central plug surrounded by an outer ring. When used in groups of three, yellow carries composite video, while red and white carry right and left audio channels.

What legacy port and cable connectors are shown in the image, and what devices did they connect?

These are Personal System 2 (PS/2) ports, which are $6$-pin mini-DIN female connectors used to attach a keyboard and mouse to a computer.

What devices connect to standard computer analog audio ports and game ports?

Analog audio ports include line-in (for external sources such as stereo systems), microphone ports, and line-out ports (for speakers or headphones); the game port connects to joysticks or MIDI-interfaced devices.

What are the alternate names, pin count, and maximum cable length of an Ethernet network port?

An Ethernet network port is also known as an RJ-45 or 8P8C port, features $8$ pins, and has a maximum cable run length of $100\,\text{m}$ ($328\,\text{ft}$).