- I want to talk to you about capacity here for a minute. Different RAM sticks have different capacities in terms of the amount of memory they hold. I've got two DDR sticks in front of me. One holds half a gigabyte, and the other one is one gigabyte, and you can't tell just by looking at them. If you're lucky, it's on the label. And if you're buying RAM, you're telling them ahead of time how much you want, but capacity is very, very important. When you're installing RAM, in general, we'd like to install the same capacity.
You can get away with a couple of things, but in general, you want to install at the same capacity at all times. And RAM is additive. So if I've got two one-gigabyte sticks and I put them into a computer, that computer's gonna have two gigabytes of RAM. Now you might think to yourself, in today's world, I can go and buy great big sticks, 16 gigabytes sticks of DDR3, even if your motherboard's DDR3, that doesn't necessarily mean you can use it. You've got to reference your motherboard book.
And if you don't have a motherboard book, you're gonna have to reference the manufacturer, and they will tell you the largest sticks that you can put in your computer. For example, my system right here can handle eight gigabytes sticks. So even though 16 gigabytes sticks are available, I can't put 'em in this system. So make sure that you reference your motherboard book or online documentation from the manufacturer to make sure you have the capacity that your particular motherboard can handle. And also remember that it's additive. So if you've got two one-gigabyte sticks, you've got two gigabytes of RAM.
If you've got four two-gigabyte sticks, you've got eight gigabytes of RAM total capacity for your system. (bright upbeat music)
The CompTIA A+ 220-901 exam is comprised of six key parts. The first, core processing, is covered by this course. Instructor Mike Meyers explains the fundamentals of PCs, microprocessors, RAM, and BIOS. He also shows you how to set up, connect, maintain, and troubleshoot the main components of a computer.
Note: The six courses designed for the CompTIA A+ (220-901) exam preparation include core processing, core hardware, peripherals and building a PC, displays and printers, networking, and laptops and mobile devices.
We are now a CompTIA Content Publishing Partner. As such, we are able to offer CompTIA exam vouchers at a 10% discount. For more information on how to obtain this discount, please download these PDF instructions.
- How do personal computers (PCs) work?
- What is a central processing unit (CPU)?
- When is random access memory (RAM) used?
- What is a basic input/output system (BIOS)?
- Installing a CPU
- Working with extensions and sockets
- Troubleshooting RAM
- Setting up a BIOS