AMD Radeon 540 vs AMD Radeon 550X Comparison

The AMD Radeon 550X and AMD Radeon 540 are both entry-level, end-of-life graphics cards built on the same Lexa chip and GCN 4.0 architecture, but the benchmark data shows they are not interchangeable. The Radeon 550X holds a commanding lead in OpenCL compute workloads, while the Radeon 540 posts a narrow victory in Vulkan performance. Average scores across the two recorded tests place the 550X at 8918, which is 16.2% higher than the 540’s 7673, yet the 540’s Vulkan result reveals a different strength profile that matters for specific applications.

Head-to-Head Benchmarks

The most decisive difference appears in Geekbench OpenCL. The Radeon 550X scores 8866, while the Radeon 540 scores 6184. That is a 43.4% advantage for the 550X, a massive gap that reflects the underlying hardware differences between the two cards. In raw compute terms, the 550X delivers 1,247.2 GFLOPS of FP32 performance, compared to 908.5 GFLOPS for the 540, a 37.3% difference. The 550X also has more shading units (512 versus 384), more texture mapping units (32 versus 24), and a substantially wider memory bus (128 bit versus 32 bit). These factors combine to make the 550X the clear choice for OpenCL-accelerated tasks such as video encoding, physics simulation, or any workload that leverages general-purpose GPU compute.

The Vulkan benchmark tells a different story. Here, the Radeon 540 scores 9162, slightly edging out the 550X’s 8970. The delta is 2.1% in favor of the 540. While this is a smaller margin than the OpenCL gap, it is still a consistent result. The 540’s Vulkan win is surprising given its lower raw specs, but the data does not lie. One possible explanation lies in the memory configuration. The 540 uses 1024 MB of GDDR5 on a 32 bit bus, delivering 24.00 GB/s of bandwidth, whereas the 550X uses 2 GB on a 128 bit bus for 112.0 GB/s. Yet in Vulkan, the 540 outperforms. The recorded scores suggest that the 540’s driver optimization or memory access patterns for this specific API are more efficient, or that the workload is not bandwidth-bound. Regardless of the cause, the benchmark results indicate that for Vulkan-based games or applications, the 540 holds a measurable, albeit modest, edge.

When compared to the nearest rivals in the database, the 550X’s average score of 8918 places it just 0.6% above the AMD Radeon Pro WX 5100 (8863) and 0.8% above the AMD Radeon R9 M265X (8851). It trails the NVIDIA GeForce GTX 660 (9022) by 1.2% and the NVIDIA TITAN V CEO Edition (9037) by 1.3%. These are tight margins, indicating that the 550X sits in a narrow performance band where small percentage differences separate cards. The 540, with an average of 7673, is 0.6% below the NVIDIA GeForce GTX 1660 Ti (7723) but 1.2% above the AMD Radeon Pro WX 3100 (7580), 1.5% above the AMD Radeon R7 250 (7557), and 1.6% above the Intel Arc A310 (7550). The 540’s rivals are clustered closely, meaning its Vulkan advantage does not translate into a higher overall ranking; it remains in the 41st percentile of all GPUs, while the 550X sits in the 45th percentile.

Where Each One Wins

The Radeon 550X wins decisively in OpenCL compute scenarios. Its 43.4% lead in that benchmark means it is the better option for any task that relies on OpenCL, such as certain video editing plugins, scientific computing libraries, or cryptocurrency mining (though that is not a recommendation, just an observation from the data). The 550X’s higher texture rate of 38.98 GTexel/s versus 28.39 GTexel/s for the 540, combined with its larger memory bandwidth, makes it more capable for texture-heavy workloads or any operation that moves large amounts of data across the memory bus. The 550X also has twice the memory capacity (2 GB versus 1024 MB), which can be a deciding factor for applications that exceed the 540’s limited frame buffer.

The Radeon 540 wins in Vulkan, scoring 2.1% higher than the 550X. Vulkan is a low-overhead API used in many modern games and emulators, so this result suggests the 540 may deliver smoother frame pacing or better utilization in Vulkan titles despite its lower raw compute. The 540 also has a slightly higher pixel rate (18.93 GPixel/s versus 19.49 GPixel/s for the 550X, actually the 550X is higher, but the 540’s Vulkan win is the data point to focus on). For users who primarily run Vulkan-based software, the 540’s edge is real, though the margin is small enough that other factors like driver maturity could influence real-world results.

In terms of physical design, the 540 is a single-slot card, while the 550X is dual-slot. This makes the 540 more suitable for compact systems or multi-GPU setups where space is at a premium. The 540 also offers two DisplayPort 1.4a outputs, whereas the 550X provides one DVI, one HDMI 2.0b, and one DisplayPort 1.4a. For multi-monitor setups using only DisplayPort, the 540 has an advantage; for legacy DVI connections, the 550X is the only option.

Architecture Differences

Both cards are built on the same Lexa chip using GCN 4.0 architecture, fabricated on a 14 nm process at GlobalFoundries. They share identical transistor counts (2,200 million), die size (103 mm²), and transistor density (21.4M per mm²). The core architecture is identical, so the performance differences come from how each card configures the available hardware.

The 550X enables 512 shading units, 32 TMUs, and 16 ROPs. The 540 disables some of these, leaving 384 shading units and 24 TMUs, but retains the same 16 ROPs. This means the 550X has 33.3% more shading units and 33.3% more TMUs than the 540. The pixel rate is nearly identical (19.49 GPixel/s versus 18.93 GPixel/s), which makes sense because both cards have the same number of ROPs. The texture rate differs more significantly: 38.98 GTexel/s for the 550X versus 28.39 GTexel/s for the 540, a 37.3% difference that mirrors the TMU count.

Memory is where the cards diverge sharply. The 550X uses 2 GB of GDDR5 on a 128 bit bus, delivering 112.0 GB/s of bandwidth. The 540 uses 1024 MB of GDDR5 on a 32 bit bus, delivering only 24.00 GB/s. That is a 4.67x difference in bandwidth, which explains the 550X’s dominance in OpenCL where data throughput is critical. The 540’s memory clock is 1500 MHz (6 Gbps effective), while the 550X runs at 1750 MHz (7 Gbps effective). The 550X’s higher memory clock and wider bus give it an overwhelming advantage in memory-bound tasks.

Clock speeds also differ. The 550X has a base clock of 1082 MHz and a boost clock of 1218 MHz. The 540’s base and boost clocks are not recorded in the database, so the comparison relies on the measured performance. The 550X’s FP32 output is 1,247.2 GFLOPS versus 908.5 GFLOPS for the 540, and both cards offer FP16 at a 1:1 ratio, meaning the same values.

Both cards share the same API support: DirectX 12 (12_0), OpenGL 4.6, and Vulkan 1.3. They also have the same TDP of 50 W, no power connectors, and a suggested PSU of 250 W. The bus interface is PCIe 3.0 x8 for both. The production status is end-of-life for both, with the 540 released on 2019-03-26 and the 550X on 2017-04-19 (note: the dates are swapped in the JSON, but the 550X is listed as released in 2019 and the 540 in 2017). The predecessor for the 550X is Polaris, while the 540’s predecessor is Arctic Islands, though both share the same successor, Vega.

The Verdict

From the recorded data, the AMD Radeon 550X is the superior card for general compute and OpenCL workloads. Its 43.4% lead in Geekbench OpenCL, combined with 37.3% higher FP32 performance, 4.67x memory bandwidth, and double the VRAM, makes it the clear choice for any task that stresses raw throughput. The 550X’s average benchmark score of 8918 places it 16.2% ahead of the 540, and it sits in a higher percentile (45th versus 41st). For users who need a low-power, no-connector card for OpenCL acceleration, the 550X is the data-backed pick.

The AMD Radeon 540 is not without merit. Its 2.1% Vulkan win over the 550X, scoring 9162 versus 8970, means that in Vulkan-specific applications, the 540 can hold its own. Its single-slot design and dual DisplayPort outputs make it attractive for space-constrained builds or multi-monitor setups that rely solely on DisplayPort. However, the 540’s 1024 MB memory and 24.00 GB/s bandwidth are severe limitations for modern workloads. The 540’s average score of 7673 is only slightly below the GTX 1660 Ti, but that speaks more to the clustering of low-end cards than to the 540’s strength.

If the choice is between these two, the 550X wins on almost every objective metric except Vulkan. The 540’s Vulkan advantage is real but narrow, and it does not compensate for the massive OpenCL deficit. The data suggests that the 550X is the more capable card for most use cases, while the 540 is a niche option for Vulkan-centric systems where space and display outputs matter more than compute performance.

FAQ

Q: Which card has a higher average benchmark score?

A: The AMD Radeon 550X has an average benchmark score of 8918, compared to 7673 for the AMD Radeon 540.

Q: How much faster is the 550X in OpenCL?

A: The 550X scores 8866 in Geekbench OpenCL, which is 43.4% higher than the 540’s 6184.

Q: Does the Radeon 540 ever outperform the 550X?

A: Yes, in Geekbench Vulkan, the 540 scores 9162 versus 8970 for the 550X, a 2.1% advantage for the 540.

Q: What is the memory bandwidth difference?

A: The 550X has 112.0 GB/s of bandwidth on a 128 bit bus, while the 540 has 24.00 GB/s on a 32 bit bus.

Q: Are both cards the same physical size?

A: No, the 550X is dual-slot, while the 540 is single-slot. The 540 also has two DisplayPort outputs, whereas the 550X has one DVI, one HDMI, and one DisplayPort.

Q: Which card has more shading units?

A: The 550X has 512 shading units, while the 540 has 384. The 550X also has 32 TMUs versus 24 on the 540, but both have 16 ROPs.

Specification Differences

| Specification | AMD Radeon 550X | AMD Radeon 540 |

|---------------|-----------------|----------------|

| Generation | Polaris (RX 500X) | Polaris (RX 500) |

| Base Clock | 1082 MHz | Not recorded |

| Boost Clock | 1218 MHz | Not recorded |

| Memory Clock | 1750 MHz (7 Gbps effective) | 1500 MHz (6 Gbps effective) |

| Memory Size | 2 GB | 1024 MB |

| Memory Bus Width | 128 bit | 32 bit |

| Memory Bandwidth | 112.0 GB/s | 24.00 GB/s |

| Shading Units | 512 | 384 |

| Texture Mapping Units | 32 | 24 |

| Pixel Rate | 19.49 GPixel/s | 18.93 GPixel/s |

| Texture Rate | 38.98 GTexel/s | 28.39 GTexel/s |

| FP32 Performance | 1,247.2 GFLOPS | 908.5 GFLOPS |

| FP16 Performance | 1,247.2 GFLOPS (1:1) | 908.5 GFLOPS (1:1) |

| Slot Width | Dual-slot | Single-slot |

| Display Outputs | 1x DVI, 1x HDMI 2.0b, 1x DisplayPort 1.4a | 2x DisplayPort 1.4a |

| Release Date | 2019-03-26 | 2017-04-19 |

| Predecessor | Polaris | Arctic Islands |

| Geekbench OpenCL | 8866 | 6184 |

| Geekbench Vulkan | 8970 | 9162 |

| Average Benchmark Score | 8918 | 7673 |

| Percentile vs All GPUs | 45 | 41 |