1. RAM (Random Access Memory): Any from computer data storage that allows stored data to be accessed in any order or at random.
Types of RAM:-
RAM VOLT PIN FREQUENCY (MHz)
a. SDRAM 3.3 V 168 pins 100-133 MHz
b. DDR-RAM 2.5 V 184 pins 233-400 MHz
c. DDR2-RAM 1.8 V 240 pins 533-800 MHz
d. DDR3-RAM 1.5 V 240 pins 1066-1866 MHz
e. DDR4-RAM 1.2 V 288 pins 1866-above
2. Hard disk:- There are two types are hard disk.
a. Internal hard disk b. External hard disk.
There are two types of Internal hard disk.
a. SATA (Serial advance technology attachment ) hard disk. b. PATA (Parallel advance technology attachment) hard disk.
There are three types of SATA hard disk.
SATA-1.5 - 150 mbps
SATA- 3.0- 300mbps
SATA-6.0- 600mbps
It is consist of 22 pins
15 pin for power connector
7 pin for data connector
There are two types of PATA hard disk
PATA-ATA100- 100mbps
PATA-ATA133- 133mbps
It is consist of 44 pins
4 pins for power connector
40 pins for data connector.
b. External hard disk:- There are three types of external hard disk.
USB
Fire wire
eSATA
3. Motherboard:- Motherboard is the one of the most essential part of the pc all omponents
is connected to the motherboard such as processor, hard disk, graphic card,
RAM, etc. there are two types of motherboard.
> LGA (Land Grid Array)
> PGA (Pin Grid Array)
4. Socket:- There are many types socket in the PC.
> PGA370- pentium 3/ celeron (big)
> PGA478j- pentium4/celeron2 (small)
> LGA775- pentium/dual core/core2duo/core2qua.
> LGA1156- I3/15/17
> LGA1156- I3/15/17- new generation
> LGA2066- I9
Number of Pin Connection Motherboard
Connector Symbol Pin
> PATA data ---------------IDE------------ 40
> ATX -------------------- SMPS--------- 20+4
> SATA power------------- HDD---------- 15
> Router or Modem--------DB-9--------- 9
> Dotmatrix-----------------DB-25--------- 25
> USB port------------------------------------4
> LAN/NIC/Ethernet--------------------- -- 8
> Floppy------------------- FDD------------ 4
> VGA---------------------- DP 15---------- 15
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