AMD Radeon 540 vs AMD Radeon Vega 8 Mobile Comparison

The AMD Radeon 540 and AMD Radeon Vega 8 Mobile represent two distinct approaches to mobile graphics, and the benchmark data reveals a clear split in their strengths. The Radeon 540, a discrete part from the Polaris generation, wins decisively in Vulkan workloads, while the Vega 8 Mobile, an integrated GPU based on GCN 5.0, takes the lead in OpenCL. With each card claiming one victory in their head-to-head tests, the choice between them depends entirely on the application's API and workload characteristics.

Head-to-Head Benchmarks

The two GPUs split their head-to-head matchups, with each winning by a significant margin in its preferred test. In the Geekbench OpenCL benchmark, the AMD Radeon Vega 8 Mobile scores 7,435 points, defeating the AMD Radeon 540's 6,184 points by 16.8%. This is a substantial gap, indicating that the Vega 8 Mobile's architecture is notably better suited to general-purpose compute tasks that leverage OpenCL. The Radeon 540's score places it in the 41st percentile of all GPUs, while the Vega 8 Mobile sits at the 39th percentile, showing that despite the Vega's win here, both are positioned in the lower-middle tier of overall performance.

The tables turn completely in the Geekbench Vulkan test. Here, the AMD Radeon 540 scores 9,162 points, a massive 31.4% advantage over the Vega 8 Mobile's 6,970 points. This is a dominant victory and highlights a stark difference in how each GPU handles Vulkan's lower-level API. The Radeon 540's discrete memory configuration likely plays a crucial role, as dedicated GDDR5 memory at 24.00 GB/s bandwidth avoids the system memory bottleneck that the Vega 8 Mobile faces. The Vega 8 Mobile's Vulkan score of 6,970 is dramatically lower than its own OpenCL result, suggesting a significant architectural inefficiency in Vulkan execution.

Looking at average benchmark scores, the Radeon 540 achieves 7,673 across all tests, while the Vega 8 Mobile reaches 7,203. This gives the Radeon 540 a 6.5% overall lead in aggregate performance. The Radeon 540's nearest rival is the NVIDIA GeForce GTX 1660 Ti, with an average score of 7,723, putting the Radeon 540 just 0.6% behind that card. On the other side, the Vega 8 Mobile's closest competitor is the NVIDIA GeForce GTX 750, which scores 7,222, placing the Vega just 0.3% behind. These rival comparisons show that while the Vega 8 Mobile trades blows with older discrete GPUs, the Radeon 540 sits in a slightly higher performance class.

The Verdict

The data presents a clear, albeit bifurcated, verdict. For users running Vulkan-based applications or games, the AMD Radeon 540 is the unequivocal choice, outperforming the Vega 8 Mobile by 31.4% in that specific test. This is the single largest performance delta in the entire comparison, and it makes the Radeon 540 the superior option for modern API workloads. Its average benchmark score of 7,673 also edges out the Vega's 7,203, giving it the overall performance crown.

However, the AMD Radeon Vega 8 Mobile is not without its merits. Its 16.8% victory in OpenCL shows that for compute-heavy tasks using that API, it is meaningfully faster. This makes it a better pick for certain professional workloads or applications that rely on OpenCL acceleration. Additionally, the Vega 8 Mobile's 25 W TDP is half of the Radeon 540's 50 W, making it a far more power-efficient solution for thin-and-light laptops where thermal headroom is at a premium. The Radeon 540, as a discrete card, requires its own power allocation and a single-slot space, while the Vega 8 Mobile is an IGP integrated directly into the processor.

Ultimately, the verdict depends on the priority. If maximum graphics performance in Vulkan is the goal, the Radeon 540 wins outright. If power efficiency and OpenCL compute performance are more important, the Vega 8 Mobile is the better choice. The data does not support a universal winner; it supports two distinct use cases.

Architecture Differences

The two GPUs come from different architectural generations. The AMD Radeon 540 is built on GCN 4.0, using the Lexa chip, and belongs to the Polaris (RX 500) generation. In contrast, the AMD Radeon Vega 8 Mobile uses GCN 5.0, built on the Raven-M chip, and is part of the Vega IGP (Raven Ridge-M) generation. This architectural divide explains many of the performance differences observed.

The process nodes are identical at 14 nm, with both using GlobalFoundries as the foundry. However, the transistor counts and die sizes differ dramatically. The Radeon 540 packs 2,200 million transistors on a 103 mm² die, resulting in a transistor density of 21.4M per mm². The Vega 8 Mobile is a much larger chip, with 4,940 million transistors on a 210 mm² die, giving it a slightly higher density of 23.5M per mm². The Vega 8 Mobile's larger chip is expected, as it integrates the GPU alongside other system components in an IGP configuration.

The compute units are structured differently, with the Radeon 540 featuring 384 shading units, 24 texture mapping units (TMUs), and 16 render output units (ROPs). The Vega 8 Mobile has more shading units at 512 and more TMUs at 32, but fewer ROPs at just 8. This configuration explains the pixel rate disparity: the Radeon 540 achieves 18.93 GPixel/s while the Vega 8 Mobile manages only 8.808 GPixel/s. The Radeon 540's higher ROP count is directly responsible for its superior fill rate.

Texture rates tell a different story. The Vega 8 Mobile achieves 35.23 GTexel/s, which is higher than the Radeon 540's 28.39 GTexel/s, thanks to its additional TMUs. The FP32 performance follows suit, with the Vega 8 Mobile delivering 1,127.4 GFLOPS versus the Radeon 540's 908.5 GFLOPS. The Vega 8 Mobile also supports faster FP16 at 2.255 TFLOPS with a 2:1 ratio, while the Radeon 540's FP16 is locked at the same rate as FP32 (908.5 GFLOPS, 1:1).

Specification Differences

Several key specifications separate these two cards beyond their architecture. The memory subsystem is the most fundamental difference. The Radeon 540 uses 1024 MB of dedicated GDDR5 memory on a 32-bit bus, providing 24.00 GB/s of bandwidth. The Vega 8 Mobile, being an IGP, uses System Shared memory with a bus width that is also System Shared, and its bandwidth is System Dependent. This means the Vega 8 Mobile's memory performance is entirely dependent on the host system's RAM configuration, while the Radeon 540 has fixed, predictable bandwidth.

Clock speeds differ significantly. The Radeon 540 has no listed base or boost clock, but its memory runs at 1500 MHz (6 Gbps effective). The Vega 8 Mobile has explicit base and boost clocks of 300 MHz and 1101 MHz respectively. This low base clock but relatively high boost clock suggests the Vega 8 Mobile relies heavily on dynamic boosting to reach its performance levels.

The power profiles are starkly different. The Radeon 540 has a TDP of 50 W and requires a suggested PSU of 250 W, while the Vega 8 Mobile has a TDP of just 25 W and no suggested PSU listed. The Radeon 540 is a single-slot card with no power connectors, whereas the Vega 8 Mobile is an IGP with no slot width at all. The bus interface also differs, with the Radeon 540 using PCIe 3.0 x8 and the Vega 8 Mobile using an IGP connection.

Display outputs and API support show some differences. The Radeon 540 offers 2x DisplayPort 1.4a outputs, while the Vega 8 Mobile's display outputs are listed as Portable Device Dependent. Both support DirectX 12, but the Radeon 540 is at feature level 12_0 while the Vega 8 Mobile is at 12_1. OpenGL 4.6 and Vulkan 1.3 are supported by both. Release dates differ, with the Radeon 540 launching on 2017-04-19 and the Vega 8 Mobile on 2019-01-07.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The AMD Radeon 540 has a higher average benchmark score of 7,673 compared to the AMD Radeon Vega 8 Mobile's 7,203.

Q: How much faster is the Radeon 540 in Vulkan performance?

A: The Radeon 540 scores 9,162 in Geekbench Vulkan, which is 31.4% higher than the Vega 8 Mobile's 6,970.

Q: Does the Vega 8 Mobile outperform the Radeon 540 in any benchmark?

A: Yes, the Vega 8 Mobile wins the Geekbench OpenCL test with 7,435 points versus 6,184 for the Radeon 540, a 16.8% advantage.

Q: What is the TDP difference between these two GPUs?

A: The Radeon 540 has a TDP of 50 W, while the Vega 8 Mobile has a TDP of 25 W, making the Vega 8 Mobile half as power-hungry.

Q: Which GPU has more shading units?

A: The Vega 8 Mobile has 512 shading units, while the Radeon 540 has 384 shading units.

Q: What is the memory configuration of each GPU?

A: The Radeon 540 has 1024 MB of dedicated GDDR5 memory on a 32-bit bus with 24.00 GB/s bandwidth, while the Vega 8 Mobile uses System Shared memory with System Dependent bandwidth.

Where Each One Wins

The AMD Radeon 540 is the clear winner in Vulkan-based workloads, delivering a 31.4% performance advantage over the Vega 8 Mobile. This makes it the preferred choice for modern games and applications that leverage Vulkan for rendering. Its dedicated GDDR5 memory provides consistent 24.00 GB/s bandwidth, which is crucial for texture streaming and frame buffer operations in graphics-intensive tasks. The Radeon 540's higher pixel rate of 18.93 GPixel/s also gives it an edge in fill-rate-limited scenarios, making it better suited for high-resolution rendering with effects like anti-aliasing.

The AMD Radeon Vega 8 Mobile wins in OpenCL compute workloads, outperforming the Radeon 540 by 16.8%. Its higher FP32 performance of 1,127.4 GFLOPS and greater texture rate of 35.23 GTexel/s make it more capable for general-purpose GPU computing tasks such as video encoding, image processing, and scientific simulations that utilize OpenCL. The Vega 8 Mobile's 2.255 TFLOPS FP16 performance also provides a significant advantage in workloads that can use reduced precision, potentially doubling throughput in compatible applications.

Power efficiency is another domain where the Vega 8 Mobile wins, with its 25 W TDP being half of the Radeon 540's 50 W. This makes the Vega 8 Mobile ideal for ultraportable laptops where battery life and thermal management are critical. The Radeon 540, as a discrete card, requires more power and cooling, but offers the advantage of dedicated graphics memory that does not compete with system RAM. For users who primarily play Vulkan-based games, the Radeon 540 is the superior choice, while those focused on OpenCL compute or power-sensitive designs should opt for the Vega 8 Mobile.