Nvidia Geforce RTX 3080 mobile: The fastest laptop GPU just arrived
It’s not a desktop equivalent, but it hammers RTX 2080.
The only real problem with Nvidia’s new Geforce RTX 30-series laptops is that they can’t live up to their stunning RTX 30-series desktop cousins. No matter how impressively fast the mobile CPUS are—and our first tests show they offer everything from good to outrageous performance—they will never measure up to full-fat GPUS. Nor should they be expected to, except in the messy stew of modern marketing and consumer expectations.
So don’t expect this mobile GPU to be a desktop GPU. But do expect RTX 30-series laptops to offer very impressive graphics performance, even compared to some of the biggest and heaviest laptops around.
WHAT IS GEFORCE RTX 30-SERIES MOBILE?
Nvidia’s Geforce RTX 30-series is the highly anticipated mobile version of its stellar 30-series desktop GPUS. Built on the same 8nm Samsung process as the desktop models, the mobile GPU shares a lot of the same goodness. They are not, however, exactly the same.
For example, the desktop Geforce RTX 3080 packs 10GB of GDDR6X using a 320-bit bus and features 8,704 CUDA cores. It rocks 760Gbps of memory bandwidth. Our review called it a “staggering performance upgrade,” and we weren’t kidding.
The mobile RTX 3080 version steps back to 6,144 CUDA cores, either 16GB or 8GB of GDDR6 on a 256-bit bus, and 384Gbps of memory bandwidth. You’re also looking at nearly a 40-percent reduction in boost clocks, as well as tensor cores and RT cores.
All told, while the Geforce RTX 3080 mobile carries the branding of the Geforce RTX 3080 desktop, it’s a very, very different beast—and a break from Nvidia’s two previous generations. The 20-series and 10-series mobile GPUS were mostly from the same dies as the desktop GPUS, but tuned for laptops.
That’s no more the case. Comparing a score from 3Dmark Port Royal—a ray tracing– focused GPU test—a desktop Geforce RTX 2080 Super might exceed a mobile Geforce RTX 2080 Super Max-q by about 30 percent. A Geforce RTX 3080 Founders Edition, however, might exceed a Geforce RTX 3080 (max-q) in Port Royal by 50 to 75 percent. Stew on that.
We say all this because if you’re expecting the mobile RTX 30-series to replicate a desktop Geforce RTX 3080 that has a thermal rating of 320 watts and a minimum 750-watt power supply for the PC itself (remember that a laptop runs the entire system on the power brick), you’ve probably set yourself up for disappointment. There’s only so much you can do in a 4- to 6-pound gaming laptop running with a thermal envelope of 80 to 105 watts for the GPU on a 230-watt power brick. But as you’ll see in our tests, the RTX 30-series makes the most of what it has.
DYNAMIC BOOST 2.0
Among the new features Nvidia brings to its 30-series is an improved Dynamic Boost 2.0. Dynamic Boost works by shunting power from the CPU to the GPU when needed, giving the GPU 15 additional watts of power.
Nvidia raises the AI catchphrase and says Dynamic Boost 2.0 can increase performance
by 16 percent. Dynamic Boost 2.0 previously only allowed power to be shifted from the CPU to the GPU, but now it can actually flow back to the CPU from the GPU if the game is Cpu-bound rather than Gpu-bound. Nvidia said it can also now balance power with the graphics memory.
On laptops that support it, Dynamic Boost 2.0 will be on all the time without the option to turn it off, as in the previous version. On older laptops that support Dynamic Boost, you will continue to be able to turn the feature off. While pretty much any RTX laptop can support Dynamic Boost 2.0, it’s up to the laptop maker to enable it. We didn’t get deep into this feature here, but we plan to soon.
WHISPER MODE 2.0
Nvidia said it has an answer for fan noise, too, using AI to help target fan curves and frame rates during gaming on a laptop. Unlike the older version that just slowed fans down, Nvidia said the new version manages CPU power, GPU power, and temps, along with the system fans and frame rate, to hit the target the gamer sets.
HOW WE TESTED
For our test today, we used a Gigabyte Aorus 17 equipped with an 8-core Intel Core i7-10870h, 8GB Geforce RTX 3080 (Max-q), 32GB of RAM, and a 17.3-inch 300Hz panel.
Note that you’ll see us use “(Max-q)” throughout the story. Nvidia no longer uses that designation for its more-efficient mobile GPUS because they’re all from the same die—it’s just how the laptop maker configures the laptop around it. If vendors choose to implement Max-q Technologies, then it’s still a Geforce RTX 3080 laptop—but with Max-q Technologies enabled. The “(Max-q)” is our way of telling you what power and thermal capabilities the laptop maker has built in.
For comparison, we drafted the same
Acer Predator Triton 500 we used for our Dynamic Boost story. It features a 6-core Core i7-10750h, Geforce RTX 2080 Super Max-q, 32GB of RAM, and a 15.6-inch, 300Hz panel.
The Predator Triton 500 had its Coolboost feature enabled, which runs the fans harder. The Gigabyte Aero 17 had the CPU and GPU in the boost setting, and fans were using the “Gamer” profile.
Using the Ultra preset in Far Cry, the results give the RTX 3080 laptop about a 12-percent lead over the RTX 2080 Super laptop.
Moving onto Gears Tactics run at 1920x1080 and set to Ultra, the RTX 3080 laptop has about a 14-percent advantage in this turn-based tactical game.
Moving to something far less graphically intense, we fire up Counter Strike: Global Operations set to 1920x1080 and using the “Very High” Preset. We’re not even sure “Very High” meant that when the game came out in 2012, but from 2021, it’s definitely not high at all. This is one game that actually exceeds the 300Hz refresh of the panels, and it’s probably a game where you need it if you want to compete to win or just don’t like getting Awp-shot by a 12-year-old every time you rush the bomb site. Yup, that’s about a 3.5-percent advantage for the RTX 3080 laptop over the RTX 2080 Super. So—the terrorists win.
Obviously one problem with the previous games we’ve run is they’re all very much Cpu-bound. It is, in fact, a problem for the
RTX 3080 on laptops. Just as laptop GPUS are a compromise to make them work in a laptop, so too are CPUS. To stretch the laptops a little more, we fired up Red Dead Redemption 2 with the performance slider set to prefer quality. That saw the RTX 3080 open up a little more breathing room, edging out the RTX 2080 Super by about 18 percent.
RAY-TRACING PERFORMANCE
We moved on to hardware ray-tracing games, specifically Metro Exodus, which uses hardware ray-traced global illumination. The result gave the RTX 3080 laptop about a 20 percent lead over the RTX 2080 laptops.
Next up on our ray-tracing performance adventure is Shadow of the Tomb Raider, with textures set to Ultra and ray-traced shadows set to Ultra as well. This saw the RTX 3080 open up about a 27 percent performance advantage over the 2080 Super.
We decided to take it up one more notch by running the Bright Memory: Infinite Ray
Tracing Benchmark. As you can guess from its name, it’s a benchmark (and game too) that uses pretty much Nvidia’s whole bag of tricks: ray-tracing caustics, reflection, refraction, ambient occlusion, shadows, and DLSS 2.1. We ran it on its highest setting with DLSS on.
We suspect this won’t be running on AMD’S Radeon RX 6000 ( go.pcworld.com/ rx60) anytime soon. We can say the RTX 3080 shows a little pep in outpacing the RTX 2080 Super by 38 percent.
Our last game is Quake II RTX, a fully path-traced game that brings new life to a classic. We run it at 19x10 with global illumination and set to “prefer Nvidia extensions” rather than Vulkan for the ray tracing. The result puts the 3080 laptop about 30 percent ahead of the 2080 Super— not too shabby.
Given the Cpu-limited performance of laptops, it’s generally going to be pretty difficult to extract the performance out of the RTX 3080—even if differs greatly from the desktop counterpart.
For example, drawing on scores from the laptops we’ve tested in-house, the RTX 3080 mobile stacks up very well indeed. Two laptops are still faster than it—the original Alienware Area 51M with a desktop CPU and Geforce RTX 2080 (non–max-q version), and the Acer Predator Helios 700, which is
equipped with a full-tilt RTX 2080 and a CPU that hits very high clocks when the keyboard is pulled back to allow for extra venting.
We should point out that the Alienware Area 51m used a 330-watt plus a 180-watt power brick and weighed about 8 pounds, while the Predator Helios 700 used a 330watt brick and weighed 10 pounds. You can’t beat the physics of larger and heavier.
Dialing up the graphics load from 3Dmark Time Spy to Port Royal, we collected results to see if the RTX 3080 would continue to lose to the RTX 2080 laptops. As you can see, as we move to a heavily Gpu-bound and ray-traced load, the RTX 3080 rightfully pops back on top.
The Port Royal results also show that it’s not just the GPU that is important—it’s also the implementation. You can find downright pokey RTX 2080 Super laptops and fast RTX 2080 Super laptops. You should expect the same with the RTX 3080.
While the RTX 3080 doesn’t deliver a slam-dunk in gaming, there is good news for content creators: Geforce RTX 3080 definitely crushes its predecessor. We’ll keep it brief, but using Blender 2.91, we tasked both laptops with using the GPU to render
the BMW GPU test. The Geforce RTX 2080 Super took about 36 seconds, while the Geforce RTX 3080 finished in just 19 seconds—basically half the time.
We also used Indigobench, a Gpu-based renderer. The results are in M Samples per second, and a longer bar is better. The 3080 turns in a score about 83 percent higher.
Our last content creation test uses V-ray Next’s GPU render to measure performance of the GPUS. The Geforce RTX 3080 is about 104 percent faster than the RTX 2080. We also culled results from Puget Systems, which put the Geforce RTX 3080 mobile ahead of a Geforce RTX 2080 Ti and Titan RTX.
BOTTOM LINE
Overall, we think the Geforce RTX 3080 is indeed the best mobile GPU available right now. To be fair, it’s not much of a bar to set if all you have to be is better than the previous GPU. Don’t let your expectations be warped by the stunning Geforce RTX 3080 desktop card.
Once we settled back into the reality that a laptop…is a laptop…is a laptop, we could acknowledge that seeing 15- to 25-percent improvements in graphically intensive games, and even more with ray-traced titles, is quite respectable.
Would we upgrade from an RTX 20-series laptop? Probably not, unless it’s a bigger step such as a side move of going from an RTX 2060 to something faster. It rarely makes sense to upgrade from one generation to the next unless you are doing it for the huge boosts in content creation advances.
When every laptop is its own package, our first review of a new component isn’t our definitive one. We’ll have a better feel for RTX 30-series laptops after we’ve tested another half-dozen or more. But clearly, it can do very well indeed.