How to Choose a Graphics Card: What Matters and What Fits Your PC
A graphics card (also called a GPU) is often the most expensive part of a PC, and the easiest to get wrong. Most guides start with a ranking of the fastest cards. This one starts with a different question: will the card work well in your PC? Then it explains the specs, so you can judge any card yourself.
One thing up front: RigFit shows specs and compatibility. We don’t run speed tests or publish frame rates. For speed, read independent reviews. Below, we explain how.
The short answer
- 1080p (Full HD) gaming: at least 8 GB of graphics memory.
- 1440p (QHD) gaming: at least 12 GB.
- 4K gaming: at least 16 GB, and a strong power supply.
- Video editing and 3D: 12 GB or more.
- AI (running models on your own PC): 12 GB or more, and NVIDIA first, because most AI software is built for NVIDIA’s CUDA platform.
Our checker uses these same rules. They are a floor, not a target. Memory alone doesn’t make a card fast.
Will it fit and work in your PC?
Almost any modern graphics card plugs into any modern desktop board. But “it plugs in” is not the same as “it works well.” Check five things.
1. The PCIe slot and link speed
The card sits in a long slot on the board called a PCIe x16 slot. PCIe (PCI Express) is the connection between the card and the rest of the PC. Two numbers describe it:
- Generation (PCIe 3.0, 4.0, 5.0). Each generation doubles the speed of each lane.
- Lanes (x16, x8, x4). Like lanes on a road: more lanes carry more data at once.
Generations work both ways. A PCIe 5.0 card works in a PCIe 3.0 slot; the link just runs at the lower of the two.
Here is the catch most guides skip. Many budget and midrange cards use only 8 or 4 lanes, even though they fit a full-size slot. On a new board, that’s fine. On an older PCIe 3.0 board, an x8 card gets half the link speed it was designed for, and an x4 card a quarter. That hurts most when a card runs out of its own memory and has to pull data over the slot. Cards with 8 GB or less, and x4 cards, feel it first.
| Lanes | Examples in our data |
|---|---|
| x16 | GeForce RTX 5070, 5070 Ti, 5080, 5090; Radeon RX 9060 XT, 9070, 9070 XT; Arc A750, A770 |
| x8 | GeForce RTX 3050, 4060, 4060 Ti, 5050, 5060, 5060 Ti; Radeon RX 6600, 6600 XT, 7600, 7600 XT; Arc B570, B580 |
| x4 | Radeon RX 6400, RX 6500 XT |
Three things set the link: the card, the board’s slot and the CPU. On AMD’s older AM4 platform, B450 and A520 boards run the graphics slot at PCIe 3.0. B550 and X570 boards can run PCIe 4.0, but only with a CPU that supports it. Some popular AM4 chips, such as the Ryzen 5 5500 and Ryzen 5 5600G, are PCIe 3.0 only, even on a B550 board.
What our checker does: you tell it your board and CPU, and it works out the link the card will run at, such as “PCIe 4.0 x8,” and which part sets the limit. It warns you when an x8 or x4 card will lose link speed. It also flags cards sold only inside pre-built PCs, and reminds you that Intel Arc cards need Resizable BAR (a BIOS setting) turned on. It does this for AM5 boards and Intel 600, 700 and 800 series boards. For older AM4 boards it can’t yet read the slot generation, so use the rules above.
On some boards, using a second large slot or certain M.2 drive sockets drops the main slot from x16 to x8. Your board’s manual shows which slots share lanes.
2. Power supply wattage
Each card has a board power figure: roughly how many watts the whole card draws under load. In our data it ranges from 53 watts (Radeon RX 6400) to 575 watts (GeForce RTX 5090).
Card makers publish a recommended power supply (PSU) wattage on each model’s spec page. Use that number, not a guess. It assumes a typical PC around the card and leaves room for short power spikes. An old, cheap PSU can struggle even when its label says enough watts.
Our checker doesn’t check your PSU yet. The wattage is printed on the label on the PSU itself.
3. Power connectors
Small cards can run on the 75 watts the slot provides. Most need extra cables from the PSU:
- 6-pin PCIe: up to 75 watts each.
- 8-pin PCIe: up to 150 watts each. Cards may need one, two or three.
- 12V-2x6 (and the older 12VHPWR): one small 16-pin plug rated for up to 600 watts, used on many newer high-end cards. Older PSUs lack this cable, so these cards usually come with an adapter from several 8-pin plugs.
The plug depends on the exact card, not just the chip. Two brands’ versions of one chip can differ. Check the exact model’s spec page, then count the free cables on your PSU. Push a 12V-2x6 plug in all the way, and don’t bend the cable sharply at the plug.
4. Card length and thickness
Look for two numbers on the card’s spec page:
- Length in millimeters. Compare it with your case’s “maximum GPU length.” Front fans, radiators and drive cages can reduce the real space.
- Slot width, such as 2-slot or 3.5-slot. Thick cards can cover a second slot or an M.2 heatsink.
Our checker doesn’t check case clearance yet. Measure inside your case, or look up its spec sheet.
5. CPU balance (the “bottleneck” question)
A “bottleneck” means one part holds back another. In games, the CPU prepares each frame and the graphics card draws it. If the CPU can’t keep up, a faster card won’t help much.
Honestly, it depends on the game, resolution and settings. At 1440p and 4K the card does more of the work, so an older CPU matters less. At 1080p with a high-refresh monitor, the CPU matters more. Online “bottleneck calculators” give one percentage for every case, and that isn’t how it works. Instead, find reviews that test a CPU like yours with the card you want.
What the specs mean
Graphics memory (VRAM). The card’s own fast memory, which holds textures and other game data. When a game needs more than the card has, you get stutter and blurry textures, however fast the chip is. Watch for one name sold in two memory sizes. The GeForce RTX 5060 Ti launched in 8 GB (from $379) and 16 GB (from $429) versions, and the Radeon RX 9060 XT also comes in 8 GB and 16 GB. Check which one a listing sells.
Memory type and bus. GDDR6, GDDR6X and GDDR7 are generations of graphics memory; newer ones move data faster. The bus width (such as 128-bit or 256-bit) is how wide the path to that memory is. Together they set memory bandwidth. Compare these only within one brand’s family. Across brands, trust reviews over spec sheets.
Board power. More power usually means more heat, more noise, a larger cooler and a bigger PSU. It doesn’t tell you speed.
Ray tracing. A more realistic way to draw light, shadows and reflections. It costs a lot of performance. Recent cards from all three brands support it, but how well varies, so check reviews that test it.
Upscaling (DLSS, FSR, XeSS). The game draws each frame at a lower resolution, and the card scales it up: more frames for a small loss in sharpness. DLSS is NVIDIA’s and needs an RTX card. FSR is AMD’s; older versions run on most cards, but the newest features need recent Radeon cards. Intel’s XeSS also runs on other brands. Frame generation inserts made-up frames between real ones. Motion looks smoother, but the game doesn’t respond faster to your input. Be wary of charts that count generated frames as real ones.
Matching the card to your screen and use
| Card | Memory | PCIe | Board power | Launch price |
|---|---|---|---|---|
| Intel Arc B570 | 10 GB | 4.0 x8 | 150 W | $219 |
| Intel Arc B580 | 12 GB | 4.0 x8 | 190 W | $249 |
| GeForce RTX 5050 | 8 GB | 5.0 x8 | 130 W | $249 |
| GeForce RTX 5060 | 8 GB | 5.0 x8 | 145 W | $299 |
| Radeon RX 9060 XT | 8 or 16 GB | 5.0 x16 | 150–160 W | from $299 |
| GeForce RTX 5060 Ti | 8 or 16 GB | 5.0 x8 | 180 W | from $379 |
| GeForce RTX 5070 | 12 GB | 5.0 x16 | 250 W | $549 |
| Radeon RX 9070 | 16 GB | 5.0 x16 | 220 W | $549 |
| Radeon RX 9070 XT | 16 GB | 5.0 x16 | 304 W | $599 |
| GeForce RTX 5070 Ti | 16 GB | 5.0 x16 | 300 W | $749 |
| GeForce RTX 5080 | 16 GB | 5.0 x16 | 360 W | $999 |
| GeForce RTX 5090 | 32 GB | 5.0 x16 | 575 W | $1,999 |
1080p. The most common screen. 8 GB is our floor; more memory ages better. With a high-refresh monitor (144 Hz or more), your CPU matters more here than at any other resolution.
1440p. We ask for 12 GB. The middle of each brand’s lineup usually lives here.
4K. Four times the pixels of 1080p. We ask for 16 GB. Expect to use upscaling in demanding games, even on expensive cards, and budget for a bigger PSU.
Video editing and 3D. Memory helps with high-resolution timelines and big scenes. Check that your software supports the card’s video encoder and compute features; some tools work best with one brand.
AI. The size of model you can run depends mostly on memory. Most AI tools are built first for NVIDIA’s CUDA. AMD and Intel cards work with some tools, with more setup.
How to compare two cards
- Does each fit your PC? Link speed on your board, PSU wattage, power plugs, length and slot width.
- Memory: does each meet the floor for your screen and use? Is the listing the right memory version?
- Today’s price, not launch price. Launch price is what the maker suggested on day one; street prices move with supply.
- Speed in reviews, at your resolution, in games or apps you use.
- Heat and noise of the exact model, not just the chip.
- Features you’ll use: upscaling, video encoding, AI support.
- Warranty and returns.
How to read a benchmark chart. Charts usually show average frames per second (FPS). Before you trust one:
- Check the resolution and settings. A 4K result says little about 1080p.
- Check the test PC. Reviewers often use the fastest CPU available. With an older CPU, your results may be lower.
- Look at 1% lows as well as averages. They show stutter.
- Check whether upscaling or frame generation was on for both cards.
- Prefer many games and several independent reviewers over one score. Rankings built from user-submitted tests can be skewed by who submits them and how they’re scored.
You can put two cards side by side at RigFit compare: memory, PCIe link, board power and launch price. Speed comes from reviews.
NVIDIA vs AMD vs Intel
All three make good cards. The trade-offs, without the marketing:
- NVIDIA (GeForce): the widest software support, especially for AI (CUDA) and many creative apps, and DLSS in many games. At a given price, it has often offered less memory than AMD.
- AMD (Radeon): has often offered more memory for the money. AI support is improving but narrower than NVIDIA’s.
- Intel (Arc): low prices with generous memory, such as 12 GB on the Arc B580 at a $249 launch price. The drivers are younger, so check reviews of your games. Arc needs Resizable BAR, which very old boards may lack.
Switching brands is easy: uninstall the old driver, then install the new one.
Common mistakes
- Buying on the chip name alone. One name can hide different memory, length and power plugs.
- Ignoring the link on an old board. An x8 or x4 card on PCIe 3.0 loses link speed.
- Forgetting the PSU wattage and connectors.
- Not measuring the case.
- Trusting one chart, especially one with frame generation on or a resolution different from yours.
FAQ
Will any graphics card work with my motherboard? Nearly any modern card works in a board with a PCIe x16 slot. What changes is the link speed, and whether your PSU and case can handle the card.
How much VRAM do I need? Our rule: at least 8 GB for 1080p, 12 GB for 1440p or creative work, 16 GB for 4K, and 12 GB for AI.
Can I put a PCIe 4.0 or 5.0 card in a PCIe 3.0 slot? Yes. It runs at PCIe 3.0. For x16 cards that rarely matters much; for x8 and x4 cards it matters more.
What power supply do I need for my graphics card? The wattage recommended on the exact card’s spec page, with the right free connectors (8-pin or 12V-2x6).
Is my CPU too slow for a new graphics card? It depends on the game and resolution. It matters most at 1080p with a high-refresh monitor. Look for reviews that test a CPU like yours.
Find a card that fits
See which graphics cards fit your PC. Tell us your board and CPU, then your use, screen and budget. We’ll suggest cards that fit, show the PCIe link each one will run at, and list what you still need to check yourself. Torn between two? Compare them side by side.