RAM, CPU, GPU, HDD and SSD? All inside of it like (types, generations, speed and a lot more)

Brief

Our laptop has SDRAM not the DRAM.

You can use crucial software to scan your RAM & SSD upgrade in your laptop. (Link)

CPU-Z to check the laptop hardware configurations mentioned in the title.

1. RAM

•  CAS latency

• The lower the CAS, the faster the RAM—and consequently, the more expensive. When deciding between RAM of different clock speeds, the RAM with the higher clock speed is superior; but when choosing between RAM of identical clock speeds, the RAM with lower CAS latency is faster.
• DDR3 RAM usually has a CAS latency of 9 or 10, while DDR4 will have a CAS latency of at least 15. However, because of its faster clock speeds, the newer standard has better performance overall.

• SDRAM vs DRAM
• Synchronous random access memory (SDRAM) is the same as (Dynamic Random Access Memory) DRAM except that regular DRAM is asynchronous.
• Synchronous random access memory stays synchronized with the computer's clock which allows greater efficiency in storing and retrieving data compared to asynchronous DRAM.

• DDR

• Double Data Rate Synchronous Dynamic Random-Access Memory, officially abbreviated as DDR SDRAM, is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) class of memory integrated circuits used in computers. 
• Thus, with a bus frequency of 100 MHz, DDR SDRAM gives a maximum transfer rate of 1600 MB/s.

RAM Type	Pins (DIMM)	Common Type and Speed
DDR SDRAM	184	PC3200 = 400MHz/3200Mbps
DDR2 SDRAM	2402	DDR2-800 (PC2-6400) = 800MHz/6400Mbps
DDR3 SDRAM	2402	DDR3-1333 (PC3-10600) = 1333MHz/10,600Mbps
DDR4 SDRAM*	288	DDR4-2400 (PC4-19200)= 2400MHz/19200Mbps

Can I Mix RAM Speeds?

This question is a little bit of a mixed bag. The short answer is yes, but only sometimes.

RAM itself is compatible with other RAM of different timings and speeds. This being said, the greater the gap between the two speeds, the greater the stress your motherboard is going to incur trying to run them simultaneously. 

For example, two modules of RAM with the same speed (let’s say 2400 MHz) and slightly different CAS timings probably wouldn’t be an issue. Your motherboard would pick the slowest one and run them both at those speeds.