Advanced Computer Repair II SS2 Computer Hardware & GSM Repair Lesson Note

Class: SS2

Subject: Computer Hardware and GSM Repair

Why Upgrade?

Computers get “old” because software (like Windows, Games, or Chrome) gets “heavier” every year. Instead of throwing away a 3-year-old computer, we can change a few parts to make it feel brand new.

The three “Magic Upgrades” are RAM, Storage (SSD/HDD), and the GPU.

Upgrading RAM: The “Table Space“

RAM (Random Access Memory) is the computer’s short-term memory. It’s where the computer keeps the apps you are currently using.

• The Symptom: Your computer is slow when you have many tabs open in Chrome or when you try to use Zoom and Word at the same time.
• The Upgrade: Moving from 4GB of RAM to 8GB or 16GB.
• How to do it:
  1. Check the Type: Does your computer use DDR3, DDR4, or DDR5? You cannot mix them!
  2. Check the Slots: Open the laptop or PC case. Are there empty “seats” (slots) for more RAM?
  3. The “Click”: RAM sticks must be pushed in until the side clips “snap” into place.

Upgrading Storage: From HDD to SSD

This is the most powerful upgrade you can give any old computer.

• The Old Way (HDD): Hard Disk Drives have spinning platters. They are slow and make the computer take 2 minutes to turn on.
• The New Way (SSD): Solid State Drives have no moving parts. They are 10 times faster than HDDs.
• The Upgrade: Replacing your old HDD with an SATA SSD or an M.2 NVMe SSD.
• The “Human” Result: A computer that used to take 2 minutes to start will now start in 15 seconds. It feels like magic!

Upgrading the GPU: The “Artist”

The GPU (Graphics Processing Unit) handles everything you see on the screen. Most office computers have “Integrated” graphics, which are weak.

• The Symptom: You try to play a game or edit a video, and the screen “lags” or the computer crashes.
• The Upgrade: Plugging a Dedicated Graphics Card (like NVIDIA or AMD) into the PCIe slot on the motherboard.
• The “Human” Side: This is for the gamers and the creators. It allows the computer to draw complex 3D worlds and high-definition videos without breaking a sweat.

The “Bottleneck” Concept

As a technician, you must be honest with your customers about Bottlenecks.

Imagine a fast Ferrari engine (a powerful CPU) put inside a car with wooden wheels (low RAM). The car will still be slow.

• If you have a fast CPU but only 2GB of RAM, the RAM is the bottleneck.
• If you have 32GB of RAM but an old, slow HDD, the HDD is the bottleneck.

The Pro Tip: Always upgrade the part that is holding the others back!

Summary: Upgrade Compatibility Table

Student Practical Activity

“Open a desktop computer case in the lab. Identify the RAM slots, the SATA cables leading to the Hard Drive, and the long PCIe slot for the Graphics Card. Look at the labels on the RAM—can you tell if it is DDR3 or DDR4?”