AMD's Vega Graphics Cards Could Kick Off a War

By Alex Cranz on at

Every nerd loves a good tech war: Windows vs Mac, Apple vs Android, Intel vs AMD. They give us something to armchair argue about over beers with friends—or to rant over in the comments of illustrious tech blogs. After spending the weekend playing with AMD’s new Vega 64 and Vega 56 graphics cards I think I can safely say an old tech war is back on—even if AMD’s latest salvo feels paltry. Nvidia might be leading the discrete graphics card industry, but AMD’s two newest cards are cheap and fast enough to finally compete. And that can only mean good things for PC users.

AMD, which purchased Nvidia’s previous competitor, ATI Graphics, has been losing the GPU war for a while. Nvidia is currently producing the majority of discrete graphics cards found in computers today. According to Jon Peddie Research, by the end of 2016 Nvidia had more than 70 per cent of the discrete graphics market. AMD trailed far behind with just 29 per cent. So AMD decided to focus on building cheap cards to go in cheap machines—like the 550 I reviewed back in April.

The AMD Vega 64 and Vega 56 are an attempt to lure people away from the £500 Nvidia 1080 with cheaper options that start to approximate its performance. When the Vega microarchitecture the cards are based on was announced back at CES, people didn’t immediately leap out of their seats. AMD didn’t have a cool hook like when Nvidia announced it had spent “billions” to develop its latest card. All AMD had was a promise of speed when the cards arrived this summer.

Eight months later, the Vega 64 and 56 are here. The AMD Vega 64 retails for around £600, while the AMD Vega 56 doesn't have a UK price yet, but will likely be around £400-£500. Both also have 8GB of RAM built in. The big difference between the two is the number of compute units—think of those like the cores in a CPU (the more the better). The Vega 64 has 64 compute units and the Vega 56 has 56.

The heart of every Vega card.

While Nvidia doesn’t measure compute units in the same way—it does have the Nvidia 1080, a £500 discrete GPU with 8GB of RAM. That’s the GPU I elected to compare AMD’s latest beasts to, and what I found was far less exciting that what I’d hoped for. While the AMD Vega 64 was, on occasion, faster than the 1080, it never blew my hair back. Instead it was sort of like going to the car lot and having to choose between a Honda Civic or a Toyota Corolla. They’re both very nice, cost the same, and do the same damn thing.

What was really astounding was the performance of the AMD Vega 56. Despite being the cheaper option, it played Overwatch and Civilization VI only marginally slower. The 1080 managed 112 frames per second playing Overwatch on Ultra at 4K, the the Vega 64 did a slightly faster 114, but the Vega 56 pulled of 99 frames per second at 4K with the graphics cranked to Ultra. That’s not just a little respectable, that’s really damn good. In Civilization VI the difference was even smaller, with the Vega 56 only taking about 1.5 milliseconds longer between frames than the 1080 or Vega 64.

In one case the Vega 56 did even better than the Nvidia 1080, and was on par with the more expensive Vega 64 too. When I rendered a frame in Blender, graphics software that allows you to create large 3D images that heavily tax a discrete GPU, the Nvidia 1080 took 9 minutes and 34 seconds. The Vega 64 rendered the same frame in 9 minutes and 28 seconds. The Vega 56? Just 9 minutes and 29 seconds. With that kind of neck and neck performance there’s no reason to really buy either a Nvidia 1080 or Vega 64 over the Vega 56.

But speed isn’t the only factor to consider when buying a discrete graphics card. See, the cards that go in your desktop PC are very power hungry. If your power supply can’t provide enough juice, the GPU is worthless, and that is one place Nvidia performs far better than AMD every time. The Nvidia 1080 demands 180 watts of power to run. The Vega 56 requires 210 watts, and the Vega 64 requires a whopping 295 watts.

Two 8-pin power connectors feels a little power hungry.

All the extra juice means you have to use not one, but two 8-pin power connectors from you power supply. The Nvidia 1080 requires just one 8-pin power connector.

With the new Vega cards AMD is trying to get around the power constraints of it GPUs by offering some software solutions. The first, and most notable, is the Radeon Chill feature, and it’s actually sort of clever. It operates under the assumption that people don’t really need the fastest video card, they just need one fast enough for their monitor. Both AMD and Nvidia have a technology that allows cards to “sync” with monitors to deliver top-level graphics without straining the GPU (Nvidia calls its tech G-Sync, while AMD calls it FreeSync).

Both cards have three DisplayPorts and one HDMI port.

But you have to have a special monitor that works with the syncing technology and no monitor works with both the AMD and Nvidia sync tech. Radeon Chill works with any monitor. You simply tell it how many frames you actually want to see per second. Got a monitor that refreshes 60 times a second? Set the max to 60 frames per second and Radeon Chill makes magic happen. In addition, the software doesn’t try and churn out 60fps if nothing is on screen. Instead it recognises those moments of static visuals and dramatically cuts down on how much power is being used—and you can tweak the number as well. Want it to never go below 30fps? Just set the slider in the AMD software.

AMD added other software features that give users a better ability to throttle their cards without diminishing visuals. There’s a power saver mode which allows you to force the cards to sip as little as 150 watts; a Frame Rate Target Control mode that lets you cap the frames per second; and an Enhanced Sync mode that figures out the optimal frame to display on screen even if it means skipping a few other frames.

All these features make the AMD Vega cards feel incredibly practical versus the excess and overclocking shenanigans of Nvidia. It’s as if AMD is trying to say “if you want nose bleed speed go with Nvidia, but if you want control and a nice experience join us.” That’s a reasonable sale to an old woman such as myself. I play my games on a 4K TVs that have no syncing technology (though Microsoft suggests that could change next year) and can only show between 60 and 120 frames a second. I don’t need dual video cards or crazy numbers, I need good enough. And the AMD Vega 64 and AMD Vega 56 are good enough. If you’re looking for a reasonably priced card the AMD Vega 56 is a fantastic choice. But these cards aren’t enough to lure Nvidia loyalists or the power hungry away. As the latest salvo in the war between Nvidia and AMD goes, the new Vega cards are pretty weak.

README

  • These cards are neck and neck with theNvidia 1080 in the speed department.
  • But they natively draw a lot more power.
  • A bevy of software features try to resolve the power issue, but it means you’re effectively throttling your shiny new GPU.

SPEC DUMP

AMD Vega 64: 8GB of RAM 64 compute units 1274 MHz base GPU clock 484 GB/s memory bandwidth 295 watts 12.7 TFLOPS 3 x DisplayPort 1 x HDMI

AMD Vega 56: 8GB of RAM 56 compute units 1156 MHz base GPU clock 410 GB/s memory bandwidth 210 watts 10.5 TFLOPS 3 x DisplayPort 1 x HDMI