PC components

How to Buy PC Components: Processor, Memory, SSD, Power Supply

Updated 20 October 2026

Compatibility matters more than price

The most expensive mistake in a build or upgrade is buying a part that doesn't fit the rest. The processor must match the motherboard socket, and the board must match the memory type: DDR4 and DDR5 are not compatible. An older board may need a BIOS update to see a new processor. So in your request be sure to write what is already in your computer.

Parts you shouldn't save on

The power supply is often underrated, but the stability of the whole system depends on it, especially with a powerful graphics card. When buying one, look at the wattage, the efficiency certificate and the set of connectors. Buy memory as a kit of two sticks so dual-channel mode works. Choose an SSD by capacity, interface (SATA or NVMe) and write endurance. For a cooler, consider the processor's heat output and the height that fits your case.

New or used

Used processors and RAM are usually reliable, and you can save quite a bit there. Take graphics cards more carefully: ask about mining history, temperatures and warranty, and read more on the graphics cards page. Used SSDs and HDDs are checked by SMART data and remaining life. Buy used motherboards only after looking at the socket and ports for bent pins.

What to put in your request

• what exactly: graphics card, processor, memory, motherboard, SSD or HDD, power supply, case, cooler;
• model: exact name or chipset, for example Ryzen 5 5600 or B550;
• new or used;
• specifications: memory size, type and speed, power supply wattage, form factor;
• compatibility: socket, chipset, case size, what is already installed;
• warranty, delivery, budget.

Example: “I need DDR4 memory, 2×8 GB 3200 MHz, for an AM4 socket and a B550 board, new, with a warranty. Courier delivery to Tsuen Wan, budget up to HK$390.”

How to compare offers

The same name can hide different revisions and speeds. Ask for serial numbers, the board revision, the heatsink type. Ask whether there is a box and the accessories (cables, screws, thermal paste). A shop's warranty can differ in length. For assembled sets, ask for a separate price for each part so you can compare fairly.

How it works on BlaBlaPrice

You create a request on BlaBlaPrice, it is checked, and sellers of components reply in the chat: what exactly, price, warranty, delivery. They compete for your choice, so the price often comes out better. The best-value offer is shown first, with reviews of the seller next to it. Your phone number is hidden, and it is free for buyers. More on the “How it works” page.

Don't want to build it all yourself? See ready-built desktop computers.