Ask Maximum PC: Which Videocard Should I Buy?
Display Support
How many displays do you have on your desk? If the answer is “more than two,” then the graphics card equation shifts more towards AMD.
Right now, I’m running three 30-inch displays on my desk, all connected to a single Radeon HD 6970 graphics card. Of course, not everyone needs or wants three or more monitors on their desk. If you do, and you want an Nvidia-based solution, you’ll need at least two graphics cards – unless you’re running the dual-GPU GTX 590.

Nvidia’s GTX 590 can drive more than two displays, but needs two GPUs to do it.
AMD offers robust support for the latest DisplayPort 1.2 standard. That’s not all that useful today, but by mid-2011, we’ll see LCD panels with DisplayPort 1.2 connectors, as well as hubs. What this means in a practical sense is the ability to daisy chain multiple monitors off one DisplayPort connection. That will substantially simplify cabling. Even today, all AMD 6000 series GPUs can run three displays, with some models supporting five or more.
On the other hand, Nvidia’s support for stereoscopic 3D, whether in gaming, movies or 3D photographs, is much more robust than AMD’s. Some display makers are even making the necessary 120Hz refresh rate displays with embedded Nvidia 3D Vision sensors in them, like the Acer HN274H. And if you have serious Nvidia GPU horsepower, you can even have your stereoscopic 3D gaming spread out over three displays – but you’ll want high end SLI at a minimum and three-way SLI is even better. Stereoscopic 3D gaming is one the greatest performance hogs you’ll find in modern PC gaming, so the more GPUs, the better. It’s no wonder that Nvidia is pushing 3D Vision so hard – it looks good and sells more GPUs to boot.

This 27-inch Acer display has a built-in Nvidia 3D Vision sensor.
Display Limitations
You’ve got one of the latest 27-inch monitors, complete with rich, saturated colors and fast response time. You’ll want as much GPU horsepower as you can to drive your spiffy display, right?
Well, not really. Odds are, that display is a 1080p monitor: 1920x1080 pixels. If you’re lucky, maybe it’s 1920x1200. There are a handful of near-$1K 27-inch displays that run at 2560x1440, but those are as rare as teeth on a chicken.
In fact, most users often have smaller displays, running at 1080p or even lower resolutions. A good, midrange GPU, like the Radeon HD 6950 or Nvidia GTX 570, can run your games at 4x anti-aliasing and never even break a sweat. So if you’re really running a single 1080p display, you may not need multiple GPUs or even the highest end single GPU card.
Operating System Issues
Let’s say you’re totally sold on the idea of those shiny new DirectX 11 games, with spiffy features like hardware tessellation and SSAO lighting effects. You want to run them in all their DirectX 11 glory, and are ready to plunk down cash for a new graphics card.

You want SSAO, HDR lighting and tessellation? You won’t get it on Windows XP.
If you’re running Windows XP, forget all that eye candy goodness. You’ll definitely get a performance bump with a current generation graphics card, but you won’t get DX11… or even DirectX 10, neither of which is supported in Windows XP.
Your Budget: The Ultimate Reality Check
Once, a long time ago, I stood in an electronics retailer and watched a buyer come up and check out the aisle of graphics cards. He had a magazine clenched in his hand. I realized the magazine he was holding had one of my graphics card roundup articles. I watched him as he looked at the magazine, looked at the shelf full of cards, looked back at the magazine, and then finally picked up the cheapest card he could find and headed for the checkout stand.
Most of us have limited resources, and have to juggle what’s important and what’s not when it comes to managing our budgets. So no matter how much you may yearn for a badass, liquid cooled, six core fire breathing game system running triple SLI, your bank account and credit card limit may have other opinions.
It all goes back to the balanced system. You ultimately need to look at your application needs, your system specs and your display. Factor in how much money you can spend, and that will ultimately determine what you can buy.
The cool thing is just how much graphics card you can get these days for under $300. The performance of some of the newer midrange GPUs is nothing short of amazing, and absolutely smoke the $600 GPUs of a few years ago. So while games are adding more graphics features, it’s very likely you can still get superb graphics and a terrific gaming experience without sacrificing the down payment on a new car.