Graphics card buying guide: what the specs mean

A graphics card (GPU) is often the most expensive part of a gaming or creative PC, and the specification sheets are full of numbers that are easy to misread. This guide explains what the main figures mean, which ones are worth comparing, and how to make sure a card will actually fit and run in your computer. We do not publish benchmarks; for measured frame rates in specific games, read independent benchmark publications alongside the specifications here.

Start with your monitor and your games

The right card depends on what you want to drive. Three things matter most:

• Resolution. Higher resolutions mean far more pixels per frame, so they need a more capable card.
• Refresh rate. A high-refresh monitor only shows its benefit if the card can produce frames fast enough.
• The games or applications you use. Fast competitive games, demanding open-world games, video editing and 3D rendering all stress a card differently.

Decide what resolution and refresh rate you are aiming for, then compare cards that are aimed at that level. Buying far beyond your monitor's capability rarely makes sense unless you plan to upgrade the monitor soon.

The specs that matter

GPU chip and generation

The model name tells you the chip family and its tier within that family. Within one generation, higher model numbers usually mean more processing units. Across generations, the numbers are not directly comparable, so a newer mid-range card can match or beat an older high-end one. This is where independent benchmarks are most useful.

Video memory (VRAM)

VRAM stores textures and other data the GPU needs quickly. Higher resolutions, high-quality texture settings and creative work such as 3D and video can use a lot of it. Running out of VRAM can cause stutter or force lower settings, so for higher resolutions and longer ownership more VRAM gives more headroom. Memory bus width and memory type (for example GDDR6 or GDDR7) affect how fast that memory can be read.

Upscaling and frame generation

Modern cards support upscaling technologies that render at a lower resolution and rebuild a sharper image, and some support frame generation. Support varies by brand, generation and game, so check which features your games use.

Ray tracing

Ray tracing simulates lighting, reflections and shadows more realistically but is demanding. If it matters to you, look at benchmarks with ray tracing switched on, because performance can differ a lot between cards that are similar otherwise.

Will it fit, and can your PC power it?

This is where many upgrades go wrong.

• Length, height and slot width. Check the card's length in millimetres against your case's maximum GPU length, and the slot width (some cards take three or more slots).
• Recommended power supply. Manufacturers publish a recommended PSU wattage. Use it as a minimum, and check that your PSU is a quality unit with headroom.
• Power connectors. Cards use 8-pin PCIe connectors or the newer 12V-2x6 (12VHPWR) connector. Make sure your PSU has the right cables or that the correct adapter is included, and follow the manufacturer's guidance on seating the connector fully.
• PCIe version. Cards are backwards compatible with older PCIe slots, though bandwidth may be lower. Some cards with fewer PCIe lanes can be more affected on older platforms.
• Display outputs. Check that the card has the outputs your monitor needs, such as HDMI 2.1 or DisplayPort 2.1.

Partner cards: cooling, noise and size

The same GPU chip is sold by several board partners, each with their own cooler, clock speeds and size. Larger coolers with more fans can run quieter, but make the card longer and heavier. Factory overclocks usually make only a small difference. Warranty length and support differ between brands, so compare those too.

Key specs explained

Questions to ask before you buy

1. What resolution and refresh rate am I aiming for?
2. Have I checked independent benchmarks for the games or apps I use?
3. Does the card fit my case, and does my PSU meet the recommended wattage with the right connectors?
4. Is my CPU likely to hold the card back at my resolution?
5. Is the listing new, refurbished or ex-display, and who handles the warranty?
6. Is the cheapest offer the exact same partner model, or a different cooler and clock speed?

Frequently asked questions

How much VRAM do I need?

It depends on your resolution, your settings and the games you play. Newer games at higher resolutions tend to use more. If you plan to keep the card for several years, more VRAM gives more headroom. Check independent tests for the games you play.

Do I need a new power supply?

Only if your current unit does not meet the card's recommended wattage, lacks the right connectors or is old and of unknown quality. The recommended PSU figure is the place to start.

Will a new graphics card work in an older PC?

Usually, as long as it fits, your PSU can power it and your motherboard has a suitable PCIe slot. An older processor may limit performance at lower resolutions, so check your whole system before upgrading.

When do graphics card prices drop?

Prices often move around new launches and big retail events, but there is no guaranteed pattern. A price history chart shows whether today's price is below the card's own recent average.

Prices & links

HotWhatHow compares live prices from retailers as they are connected to the site. When offers are available, we rank them by the total landed price — the item price plus standard delivery — and show when each price was last checked. Some retailer links are affiliate links; we may earn a commission, which never changes which offer we label as the cheapest. This guide is based on manufacturer specifications and general product information, not on our own use of the products or our own benchmarks.