NVIDIA GeForce RTX 3080 Ti vs NVIDIA GeForce RTX 3090 Comparison

The NVIDIA GeForce RTX 3090 and the NVIDIA GeForce RTX 3080 Ti are both built on the same GA102 chip and Ampere architecture, but they are positioned differently within the GeForce 30 generation. The data shows that their average benchmark scores are nearly identical, with the RTX 3090 averaging 41441 and the RTX 3080 Ti averaging 41224, a difference of just 0.5%. However, their individual test results reveal specific strengths and weaknesses, making the choice between them less about raw overall performance and more about how they handle particular workloads and what physical characteristics matter for your build. This analysis breaks down the benchmark results, architectural differences, and practical implications to help you decide which card fits your needs.

Head-to-Head Benchmarks

The head-to-head benchmark results show a close contest, with the RTX 3080 Ti winning 6 of the 10 tests and the RTX 3090 winning 4. The margins are often small, but a few tests stand out. The largest win for the RTX 3090 comes in the Geekbench Vulkan test, where it scores 174310 versus the RTX 3080 Ti's 171798, a 1.5% advantage. This suggests a slight edge in Vulkan-based workloads and games. The RTX 3090 also wins the 3DMark Steel Nomad DX12 test, scoring 5118 against 5077, a 0.8% lead, and the Passmark GPU Compute test, scoring 15356 against 15282, a 0.5% margin. In the Passmark DirectX 12 test, both cards score exactly 110, resulting in a tie that is credited to the RTX 3090 with a 0% deltaPct.

The RTX 3080 Ti, on the other hand, claims its biggest victories in legacy and 2D-oriented tests. It wins Passmark G2D with a score of 1091 versus 1063, a 2.6% difference, and Passmark DirectX 9 with 274 versus 268, a 2.2% lead. These are the largest deltas in the entire comparison, indicating that the RTX 3080 Ti has a measurable edge in older DirectX 9 titles and 2D rendering tasks. It also wins Passmark DirectX 11 (223 vs 220, a 1.3% lead), Passmark DirectX 10 (184 vs 182, a 1.1% lead), and Passmark G3D (26896 vs 26645, a 0.9% lead). The Geekbench OpenCL test is essentially a dead heat, with the RTX 3080 Ti scoring 191309 and the RTX 3090 scoring 191142, a negligible 0.1% difference.

Interpreting these numbers, the RTX 3090 leads in modern, compute-heavy APIs like Vulkan and DirectX 12, as well as generic GPU compute tasks. The RTX 3080 Ti counters with better performance in older DirectX versions and 2D operations, which may matter if you run legacy software or applications that rely on those paths. The overall averages tell a similar story: the RTX 3090's 41441 average is just 0.5% higher than the RTX 3080 Ti's 41224, and both cards sit at the 83rd percentile among all GPUs. When compared to other rivals, the RTX 3090 is 0.4% behind the AMD Radeon Pro 5300 (which averages 41610) and 0.6% behind the NVIDIA GeForce RTX 5070 (which averages 41687), while the RTX 3080 Ti trails those same cards by 0.9% and 1.1% respectively. These small percentages reinforce that neither card has a dominant performance advantage over the other in the aggregate.

Architecture Differences

Both the RTX 3090 and RTX 3080 Ti are built on NVIDIA's Ampere architecture, using the GA102 chip manufactured on Samsung's 8 nm process. They share the same transistor count of 28,300 million and the same die size of 628 mm², resulting in an identical transistor density of 45.1M / mm². The core configurations are close but not identical. The RTX 3090 has 10496 shading units, 328 TMUs, and 112 ROPs, while the RTX 3080 Ti has 10240 shading units, 320 TMUs, and 112 ROPs. This gives the RTX 3090 a slight theoretical advantage in raw shading and texture throughput. The RTX 3090 also has 82 RT cores and 328 tensor cores, compared to 80 RT cores and 320 tensor cores on the RTX 3080 Ti, meaning the 3090 can handle ray tracing and AI-accelerated tasks with a modestly higher core count.

Clock speeds differ as well. The RTX 3090 has a base clock of 1395 MHz and a boost clock of 1695 MHz, while the RTX 3080 Ti runs at 1365 MHz base and 1665 MHz boost. This higher clock speed on the RTX 3090 contributes to its higher pixel rate of 189.8 GPixel/s versus 186.5 GPixel/s, and a higher texture rate of 556.0 GTexel/s versus 532.8 GTexel/s. In terms of floating-point performance, the RTX 3090 delivers 35.58 TFLOPS for both FP32 and FP16 (at a 1:1 ratio), while the RTX 3080 Ti delivers 34.10 TFLOPS for both. These are small but consistent differences that favor the RTX 3090 in compute-heavy scenarios.

The most significant architectural difference is memory. The RTX 3090 features 24 GB of GDDR6X on a 384-bit bus, with a memory clock of 1219 MHz (19.5 Gbps effective) and a bandwidth of 936.2 GB/s. The RTX 3080 Ti has 12 GB of GDDR6X on the same 384-bit bus, with a memory clock of 1188 MHz (19 Gbps effective) and a bandwidth of 912.4 GB/s. The RTX 3090 therefore offers double the VRAM capacity and a 2.6% higher memory bandwidth. This is the defining difference between the two cards, as the RTX 3090's 24 GB capacity is aimed at workloads that exceed 12 GB, such as large 3D scenes, machine learning models, or multi-tasking with multiple GPU-accelerated applications. The RTX 3080 Ti's 12 GB is ample for most gaming scenarios but may become a bottleneck in memory-intensive professional work.

Both cards share the same power envelope, with a TDP of 350 W and a suggested PSU of 750 W, and both use a single 12-pin power connector. They also support the same APIs: DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The display outputs are identical as well, with 1x HDMI 2.1 and 3x DisplayPort 1.4a. Physical dimensions differ notably: the RTX 3090 measures 336 mm in length, 140 mm in height, and 61 mm in width, making it a triple-slot card. The RTX 3080 Ti is considerably smaller at 285 mm length, 112 mm height, and 40 mm width, fitting into a dual-slot design. This makes the RTX 3080 Ti far easier to install in compact cases or alongside other expansion cards.

FAQ

Q: Which card has a higher average benchmark score?

A: The NVIDIA GeForce RTX 3090 has an average benchmark score of 41441, which is 0.5% higher than the RTX 3080 Ti's 41224. Both cards sit at the 83rd percentile among all GPUs.

Q: What is the most significant performance difference between the two?

A: In the head-to-head tests, the largest delta is in Passmark G2D, where the RTX 3080 Ti leads by 2.6% (1091 vs 1063). The RTX 3090's biggest win is in Geekbench Vulkan, where it leads by 1.5% (174310 vs 171798). These are the only tests with a margin above 2%.

Q: How does memory capacity differ?

A: The RTX 3090 has 24 GB of GDDR6X memory, while the RTX 3080 Ti has 12 GB. Both use a 384-bit bus, but the RTX 3090 has a higher memory bandwidth of 936.2 GB/s compared to 912.4 GB/s.

Q: Are there any tests where the two cards are exactly equal?

A: Yes, in the Passmark DirectX 12 test, both the RTX 3090 and RTX 3080 Ti score exactly 110. The result is recorded as a win for the RTX 3090 with a 0% deltaPct.

Q: Which card is physically smaller?

A: The RTX 3080 Ti is significantly smaller, measuring 285 mm in length, 112 mm in height, and 40 mm in width, and it is a dual-slot card. The RTX 3090 is 336 mm long, 140 mm tall, and 61 mm wide, requiring a triple-slot form factor.

Q: Do both cards have the same power requirements?

A: Yes, both the RTX 3090 and RTX 3080 Ti have a TDP of 350 W and a suggested PSU of 750 W, and they both use a single 12-pin power connector.

The Verdict

Based strictly on the data, the choice between the RTX 3090 and RTX 3080 Ti comes down to memory capacity and physical size, not raw performance. The average benchmark scores are nearly identical, with the RTX 3090 leading by just 0.5%. In individual tests, the RTX 3080 Ti wins more often (6 wins vs 4), but its victories are concentrated in legacy DirectX and 2D workloads, while the RTX 3090 wins in modern Vulkan and compute scenarios. If you need 24 GB of VRAM for large datasets or memory-hungry applications, the RTX 3090 is the only choice, as the RTX 3080 Ti's 12 GB will not suffice. If you are building a gaming rig and prioritize a smaller footprint, the RTX 3080 Ti's dual-slot design and shorter length make it far easier to fit into a standard case. The RTX 3090's triple-slot width and 336 mm length require a spacious chassis and careful planning. Both cards are end-of-life products, but they remain competitive in the 83rd percentile of all GPUs. For most gaming and general use, the RTX 3080 Ti offers comparable performance with better compatibility. For professional or compute-heavy workloads that exceed 12 GB of VRAM, the RTX 3090 is the definitive pick.

Specification Differences

The following specifications differ between the two cards:

• Shading Units: RTX 3090 has 10496; RTX 3080 Ti has 10240.
• TMUs: RTX 3090 has 328; RTX 3080 Ti has 320.
• RT Cores: RTX 3090 has 82; RTX 3080 Ti has 80.
• Tensor Cores: RTX 3090 has 328; RTX 3080 Ti has 320.
• Base Clock: RTX 3090 is 1395 MHz; RTX 3080 Ti is 1365 MHz.
• Boost Clock: RTX 3090 is 1695 MHz; RTX 3080 Ti is 1665 MHz.
• Memory Clock: RTX 3090 is 1219 MHz (19.5 Gbps effective); RTX 3080 Ti is 1188 MHz (19 Gbps effective).
• Memory Size: RTX 3090 is 24 GB; RTX 3080 Ti is 12 GB.
• Memory Bandwidth: RTX 3090 is 936.2 GB/s; RTX 3080 Ti is 912.4 GB/s.
• Pixel Rate: RTX 3090 is 189.8 GPixel/s; RTX 3080 Ti is 186.5 GPixel/s.
• Texture Rate: RTX 3090 is 556.0 GTexel/s; RTX 3080 Ti is 532.8 GTexel/s.
• FP32/FP16 Performance: RTX 3090 is 35.58 TFLOPS; RTX 3080 Ti is 34.10 TFLOPS.
• Slot Width: RTX 3090 is Triple-slot; RTX 3080 Ti is Dual-slot.
• Dimensions: RTX 3090 is 336 mm x 140 mm x 61 mm; RTX 3080 Ti is 285 mm x 112 mm x 40 mm.
• Release Date: RTX 3090 was released on 2020-08-31; RTX 3080 Ti on 2021-05-30.
• Launch MSRP: RTX 3090 was 1,499 USD; RTX 3080 Ti was 1,199 USD.

Where Each One Wins

The RTX 3090 wins in 4 benchmark categories, with its strongest showing in Geekbench Vulkan (1.5% lead), followed by 3DMark Steel Nomad DX12 (0.8% lead), Passmark GPU Compute (0.5% lead), and the tied Pass