GPU, CPU and RAM explained

What is the CPU?

The CPU (Central Processing Unit) is often called the "brain" of your computer. It handles most of the general calculations and instructions that make your programs run—from opening apps and browsing the web to running game logic and physics.

Key things to know:

• **Cores and threads**: Modern CPUs have multiple cores, so they can handle several tasks at once. More cores help with multitasking and in games or apps that use them well.
• **Clock speed**: Measured in GHz, this is how many instructions the CPU can process per second. Higher clock speeds generally mean snappier performance, but core count and architecture matter too.
• **For gaming**: Games rely on the CPU for AI, physics, and preparing data for the GPU. A balanced CPU avoids bottlenecks so your graphics card can run at its best.

What is the GPU?

The GPU (Graphics Processing Unit) is responsible for rendering everything you see on screen—images, videos, and especially 3D graphics in games. Unlike the CPU, it's built to do many similar calculations in parallel, which is ideal for pixels and polygons.

Key things to know:

• **VRAM**: The GPU has its own memory (VRAM). More VRAM lets you use higher resolutions and texture quality without stuttering.
• **Performance tiers**: Entry-level GPUs are fine for light gaming and work; mid-range and high-end cards deliver smooth gameplay at higher settings and resolutions.
• **For gaming**: The GPU usually has the biggest impact on frame rate and visual quality. Pair it with a CPU that can keep up to avoid limiting your FPS.

What is RAM?

RAM (Random Access Memory) is your system’s short-term memory. It holds the data and instructions that your CPU and GPU need right now, so they can access them much faster than from the storage drive.

Key things to know:

• **Capacity**: 8 GB is a minimum for light use; 16 GB is comfortable for gaming and multitasking; 32 GB or more helps with heavy workloads, streaming, or future-proofing.
• **Speed**: RAM speed (e.g. DDR4 3200 MHz, DDR5) affects how quickly data can be read and written. Faster RAM can improve performance, especially when the CPU isn’t the bottleneck.
• **For gaming**: 16 GB is the sweet spot for most games. Some newer titles and modded games benefit from 32 GB.

How do they work together?

The CPU runs your operating system and applications, sends instructions to the GPU, and uses RAM to store and fetch data quickly. The GPU uses its own VRAM and focuses on drawing the image. When you play a game:

1. The CPU runs the game logic, AI, and physics.
2. The CPU tells the GPU what to draw and feeds it data.
3. The GPU renders each frame and sends it to your monitor.
4. RAM holds game assets, OS data, and other open apps so the CPU can access them without waiting on the SSD or HDD.

If any of these components is too slow or limited, it can become a bottleneck and cap your performance. A balanced build—decent CPU, capable GPU, and enough RAM—gives you the best experience.

What to look for when buying or selling

When **buying** a PC:

• Match the CPU and GPU to your use case (e.g. gaming at 1080p vs 4K, or content creation).
• Aim for at least 16 GB RAM for gaming and general use.
• Check that the power supply and cooling are adequate for the components.

When **selling** your PC:

• Know your exact CPU, GPU, and RAM (capacity and speed if possible).
• Condition and age affect value; well-maintained systems with popular parts typically hold value better.
• Refurbished and second-hand components are a great way to get more performance for your budget—or to get a fair price when you upgrade.

Prenew offers the right solution for every need

Whether you're after a balanced gaming rig or a powerful workstation, Prenew's refurbished PCs are tested and ready to go.

• **Bronze Level**: Ideal for everyday use and light gaming. Great value for getting started.
• **Silver Level**: Solid gaming performance for popular titles at good settings. Perfect for most players.
• **Gold Level**: Strong CPU and GPU combinations for higher settings and smoother gameplay.
• **Platinum Level**: High-end components for demanding games and creative work, without the full cost of brand-new hardware.

You can also sell your current PC to Prenew and put the value toward your next build. We make it easy to upgrade responsibly and affordably.