6900 XT vs 3080: Is there a performance difference?

A comparison between AMD’s Radeon RX 6900 XT and Nvidia’s GeForce RTX 3080 offers a pretty leveled field. The 6900 XT eclipses the 3080 in some aspects, while in others, the 3080 dominates. If you want to find out more about the specifics, keep reading this 6900 XT vs 3080 comparison.

6900 XT vs 3080 – Quick Comparison

The RTX 3080 was the flagship graphics card of team green’s (Nvidia) RTX 3000 series when it came out and was hard to compete with for team red (AMD). They managed to pull it off, and two years later, they went even further by releasing the 6900 XT.

SpecsRadeon RX 6900 XTNvidia RTX 3080
GPUNavi 21 XTXGA102-200-KD-A1
InterfacePCIe 4.0 x16 (3-slot)PCIe 4.0 x16 (2-slot)
ArchitectureNavi / RDNA2 (2020-2022)Ampere
GPU Cores5,120 Stream Processors8,704 CUDA Cores
TMUs/Tensor Cores320272
RT Cores80 (Ray Tracing Accelerators)68 Gen 2 RT cores
Base Clock1,825 MHz1,440 MHz
Boost Clock2,250 MHz1,710 MHz
MemoryGDDR6GDDR6X
Memory Size16 GB10 GB
Memory Speed2,000 MHz (16 Gbps)1,188 MHz (19 Gbps)
Bandwidth512.0 GB/s760.3 GB/s
Memory Bus256-bit320-bit
TDP
(Founders Edition)
300 Watt320 W
Required PSU
(Founders Edition)
700 Watt750 W
Recommended PSU
(Founders Edition)
850 Watt800 Watt
Outputs1x HDMI 2.1
2x DisplayPort 1.4a
1x USB Type-C
1x HDMI 2.1
3x DisplayPort 1.4a
PriceCheck Price on AmazonCheck Price on Amazon

RX 6900 XT

6900 XT
AMD Radeon RX 6900 XT

AMD, a Silicon Valley-based company with over half a century of experience, is a world leader in both CPU and GPU development. While AMD’s CPUs have always been able to compete with the competition, they’ve struggled with their high-end GPUs for some time until the Radeon RX 6000 series.

The 6900 XT Founders Edition (FE), much like other cards from the series, sold out upon its release and saw its prices skyrocket. Today, you can choose between the FE version and many others from third-party manufacturers, any of which guarantee a superb gaming experience and a lot of raw GPU power.

Pros

  • Excellent 4K gaming
  • Smart Access Memory
  • 16 GB VRAM
  • High clock speeds

Cons

  • 3-slot
  • No dedicated Ray Tracing Cores

RTX 3080

GeForce RTX 3080
Nvidia GeForce RTX 3080

Nvidia, the other global leader in GPU development, never diverted from GPUs and has been offering us the best in GPU capabilities since it started almost 30 years ago. The computational capability of their GPUs powers much more than your favorite game, as they are the backbone of many AI development projects.

The RTX 3080 was the flagship model of the RTX 3000 series and was barely matched by team red’s flagship and the 6900 XT’s predecessor. It also sold out, leaving a void on the market after its release that doubled the prices of those RTX 3080 cards still available for purchase. Thankfully, that buzz has died down, making room for a drop in prices and a rise in availability.

Pros

  • Excellent 4K gaming
  • GDDR6X VRAM
  • Dedicated Ray Tracing Cores
  • Price

Cons

  • No USB-C
  • Low clock speeds

6900 XT vs 3080: Key Specifications

Architecture

AMD’s RDNA2 architecture was introduced in 2020 and can be found in the Playstation 5 and XBOX Series S and X apart from the RX 6000 series from AMD. Numerous technologies are featured in the RDNA 2 architecture, such as AMD Infinity Cache and Smart Access Memory.

AMD RDNA2 Architecture
AMD’s RDNA2 Architecture

Until the release of Smart Access Memory, CPUs could access GPU VRAM in 256-bit blocks. SAM changed this, allowing access to the entire VRAM, boosting speeds and performance drastically. Nevertheless, even with SAM and Infinity Cache, the 6900 XT only has a bandwidth of 512 GB/s, two-thirds of Nvidia’s 720 GB/s in the RTX 3080.

NVIDIA Ampere Architecture
NVIDIA’s Ampere Architecture

The RTX 3080 is based on Nvidia’s Ampere architecture, one of the fastest architectures available. It was designed with much more than gaming in mind, as Nvidia’s GPU technology powers developments in AI, machine learning, predictive medicine, and much more.

Winner: RTX 3080

Clock Speeds and Overclocking

Clock speed is the speed at which the GPU cores operate. This can be tweaked to achieve higher speeds and, thus, better results, but it can also damage your card. Generally, the RX 6000 series has faster speeds than the RTX 3000 series, and this is the case here as well.

The 6900 XT has a base speed of 1,825 MHz and a boost speed of 2,250 MHz. The RTX 3090 has a base speed of 1,440 MHz and a boost speed of 1,710 MHz. These are preset speeds that can be risen by manual overclocking.

You can manually overclock your GPU using software such as AMD’s software (for the 6900 XT) and Nvidia’s software for the 3080, or MSI Afterburner for both. If you choose to do this, always remember to raise the fan speeds on your card. You can irreparably damage your card if you overheat it.

Winner: 6900 XT

Cores

The main GPU cores of these cards are parallel processors, much like your CPU has two, four, or eight cores. The difference is that GPU cores number in the thousands5,120 (6900 XT) vs 8,704 (RTX 3080), to be exact. These are high numbers, which is why GPUs power so many high-tech operations, such as AI research and crypto farms.

The RTX 3000 Ampere series features Ray Tracing Cores, cores that are specifically dedicated to ray tracing. The RDNA 2 architecture uses ray tracing accelerators to do the same, which means that part of the main GPU cores handles the calculations required by ray tracing, essentially slowing the GPU down.

Winner: RTX 3080

VRAM and Memory Specs

The original 3080 was released with 10GB of DDR6X VRAM, and a later version offered 12GB. GDDR6X is a faster type of VRAM than regular DDR6. This is evident in the memory speed. The 6900 XT has a 2000 MHz memory speed, yet it has an effective data transfer speed of 16 Gbps. The 3080 only has 1,188 MHz but has an effective speed of 19 Gbps.

AMD compensates for this with 16GB of VRAM, which is a lot. This, coupled with the overclocking possibilities offered by the 6900 XT, make it able to offer performance at levels of the RTX 3080 and above. Nevertheless, I feel that 16GB should offer a lot more than 10GB does, and yet, that’s not the case.

Winner: Draw

Shaders, RT cores, and TMUs

AMD (and others) call them “Stream processors.” Nvidia calls them CUDA cores. Whatever you call them, they are responsible for almost every calculation made by your GPU, whether it’s rendering a flying rocket you just fired or solving blockchain calculations in a crypto mining operation. They are the power behind your GPU, but they don’t work alone.

Shaders play an important role as well. They are generic programs that calculate light, darkness, and color settings, and they work together with the RT cores in Nvidia cards when ray tracing is turned on. The main GPU cores handle physics, pixel placement, rendering, and other computations.

Nvidia RTX Ray Tracing On and Off Comparison
Nvidia RTX Ray Tracing On and Off Comparison

Ray tracing is a feature that simulates light and how it behaves in the real world. Shaders utilize the main processing GPU cores for their calculations, giving a bit of an edge to the 3080 due to their higher number. Ray tracing is handled by the RT cores. 

TMUs, or Texture Mapping Units, are low-level components that handle textures in 3D spaces. Does a tree look like it has bark in your favorite game? Thank your TMUs for that. Without them, that bark would be all over the place every time you moved your mouse. The 6900 XT has a slight edge here, as it has more TMUs than the RTX 3080.

Winner: Draw

Performance and Resolutions

Performance is all over the place with these two cards. On average, you’ll see that the 6900 XT is faster, but the average percentage is around 2%. Artificial benchmark tests have shown that the 6900 XT is better using some apps, while the 3080 is better in others.

3DMark Time Spy Test
3DMark Time Spy Test
3DMark Port Royal Test
3DMark Port Royal Test

It’s the same story for game performance. The 6900 XT offers better performance in some games, while the 3080 beats it in others. Again, averages are in very slight favor of the 6900 XT, but not so much as to justify the price difference.

Example #1

6900 XT vs 3080 Average FPS at 1080p - Test 1
6900 XT vs 3080 Average FPS at 1080p – Test 1
6900 XT vs 3080 Average FPS at 1440p - Test 1
6900 XT vs 3080 Average FPS at 1440p – Test 1
6900 XT vs 3080 Average FPS at 4k - Test 1
6900 XT vs 3080 Average FPS at 4k – Test 1

Example #2

6900 XT vs 3080 Average FPS at 1080p - Test 2
6900 XT vs 3080 Average FPS at 1080p – Test 2
6900 XT vs 3080 Average FPS at 1440p - Test 2
6900 XT vs 3080 Average FPS at 1440p – Test 2
6900 XT vs 3080 Average FPS at 4k - Test 2
6900 XT vs 3080 Average FPS at 4k – Test 2

We can attribute these results to the various difference between the cards (core count, RT cores, TMUs, etc.).

Winner: 6900 XT

Connectivity

The 6900 XT has one HDMI port, two DisplayPorts, and one USB-C port. The RTX 3080 has one HDMI port and three DisplayPorts. It doesn’t feature a USB-C port. The 3080 FE featured the new 12-pin PSU connector with an adaptor. The 6900 XT FE used 2 x 8-pin connectors. Third-party manufacturers’ versions of both cards offer various pin connectors.

RTX 3080 Pin
RTX 3080 Pin

You can find a list of the various RTX 3080 cards here, along with many other specifics (pin numbers as well) about them. The 3080 FE had a diagonally protruding 12-pin connector, something I found very handy in my build due to the sheer size of the card.

Winner: Draw

TDP

TPD stands for Thermal Design Power and is a measurement of the maximum power a subsystem is allowed to use. In this case, the subsystem is your graphics card, and TDP is how much power it can use from your PSU. It’s also how much heat a component can handle.

Both power consumption and the heat levels differ depending on load, clock speeds, your PC case and ventilation, number of fans, etc. You can see the Founders Edition comparison in the images below.

6900 XT vs 3080 Power Consumption in Watts
6900 XT vs 3080 Power Consumption in Watts
6900 XT vs 3080 Temperatures in Celsius
6900 XT vs 3080 Temperatures in Celsius

Generally, Nvidia cards consume more power than AMD cards but dissipate their heat better as well. Of course, temperatures depend on build and fan numbers, but the changes in results are minuscule.

Winner: 6900 XT

Also Read: [Complete Guide] How to Undervolt your CPU and GPU [SAFE]

Design and build

Even though these cards look cool, who cares about their design, right? Well, design and build are important factors when considering cooling and airflow within your PC case. The 6900 XT FE version offered no vents on its back, so hot air stays trapped within your case. Not the case with the 3080 — its fans vent air through the back of the card and out of your case.

Third-party versions differ from the FE versions, and so do their fan numbers, lengths, heat sinks, etc. Be careful when choosing a manufacturer version of these cards — many come already overclocked, so be sure they can handle the heat within your PC case. Also, the 6900 XT is a 3-slot card, so you’ll have to accommodate it in your PC case.

Winner: RTX 3080

Also Read: GPU Fans Not Spinning: Common causes and how to fix!

6900 XT vs 3080: Standout features

Nvidia’s Ray Tracing Cores make all the difference. They free up the main cores of the GPU to conduct other calculations while they handle ray tracing, an increasingly more popular technology that we will see a lot of in games to come.

6900 XT vs 3080: Pricing and Availability

The 6900 XT Founders Edition was released with an MSRP of $999, which has risen and fallen significantly since then. You can order yours here. You can also find many other versions from third-party manufacturers such as MSI, GIGABYTE, ASUS, and many others on Amazon.

The RTX 3090 Founders Edition was released with an MSRP of $699, not so much, all things considered. You can grab yours here. Many versions exist, as they do for the 6900 XT, and they vary in overclocking, fans, and size. Prices are all over the place for these cards, so see for yourself. You can find MSI, ASUS, and GIGABYTE versions, as well as many others.

RTX 3080 prices also differ depending on whether you opt for the 10GB or 12GB versions.

Conclusion

What I’ve learned while writing this RX 6900 XT vs RTX 3080 comparison is that the price difference is not justified. Initially or currently. Generally, the 6900 XT was, and still is, more expensive than the RTX 3080 by more than a bit, yet their performance is not that different.

Honestly, if I were choosing between the 6900 XT and the 3080 for myself, I’d go for the cheaper card due to their almost leveled performance. But that’s just me.

About Alex

Hello, I'm Alex and this is my website, Spacehop. I started the site as a way to talk about myself, and a few years later we're now a team of 6! I still work full time at a major PC retailer in the UK, and I'm a bit of a tech whizz (self-proclaimed, unfortunately!).

Leave a Comment

Previous

AMD RX 6700 XT vs Nvidia RTX 3080: Which GPU is best?

6900 XT vs 3090: Which GPU is the better investment?

Next