CPU: A CPU processing each instruction and virtually all of the data needed by the computer. The type of CPU limits the PC’s overall processing power. Pentium 4, Dual Core, Core 2 Duo, Celeron, Atom, Core i2, Core i3, Core i5 etc.
CPU speed: Even when CPUs are the same, clock speed effects performance. The Speed is 2GHz, 2.4GHz, 2.8GHz , 3.0GHx etc.
Memory slots & Type: Memory is added in the form of SIMMs (Single In-line Memory Modules) or DIMMs (Dual In-line Memory Modules). DDR1, DDR2, or DDR3 etc.
Cache memory: RAM is much slower than a CPU. so slow that the CPU
must insert pauses for memory to catch up. Cache is a technique of improving memory performance.
Chipsets: A chipset is a set of highly optimized, tightly inter-related ICs which, taken together, handle virtually all of the support functions for a motherboard. the Intel chipset, SIS chipset,
BIOS: The BIOS ROM contained on the motherboard capabilities. BIOS is a set of small programs recorded onto ROM ICs that allow the operating system
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