AMD Radeon RX 550X vs AMD Radeon Vega 8 Comparison

The AMD Radeon RX 550X and the AMD Radeon Vega 8 are both entry-level graphics solutions from the same manufacturer, but they serve fundamentally different roles. The RX 550X is a discrete add-in board designed for desktop systems, while the Vega 8 is an integrated graphics processor embedded within a Raven Ridge APU. The recorded benchmark data shows a clear performance hierarchy, with the discrete card taking a decisive lead in every shared test, but the integrated part offers a unique set of advantages that matter in specific use cases.

Where Each One Wins

The AMD Radeon RX 550X wins in every single measurable benchmark comparison where both parts were tested. In the Geekbench OpenCL test, the RX 550X scores 9662, which is 9.5% higher than the Vega 8’s 8822. The gap widens dramatically in the Vulkan API test, where the RX 550X posts 11299 against the Vega 8’s 8134, a 38.9% advantage. This makes the discrete card the clear choice for any application that relies on compute performance or modern graphics APIs.

The AMD Radeon Vega 8, despite losing both head-to-head contests, still holds a distinct niche. Its entire existence is tied to the CPU it ships with, meaning it requires no separate purchase, no additional power connections, and no dedicated video memory. The data shows it still competes in the same performance ballpark as the RX 550X in OpenCL workloads, trailing by less than 10%. For a user who already needs a Raven Ridge processor, the Vega 8 provides a baseline of graphics capability that is far above most other integrated solutions, making it a practical choice for light gaming, media playback, and general desktop acceleration without any extra hardware.

The performance percentile data reinforces this split. The RX 550X sits at the 49th percentile among all GPUs in the database, while the Vega 8 sits at the 45th percentile. This is a narrow gap in the grand scheme of all graphics hardware, but the RX 550X’s average benchmark score of 10481 versus the Vega 8’s 9221 shows that the discrete card consistently delivers more performance across the board.

Architecture Differences

The two GPUs come from different generations of AMD’s Graphics Core Next architecture. The RX 550X is built on GCN 4.0, which is part of the Polaris generation specifically the RX 500X refresh. The Vega 8 uses GCN 5.0, which belongs to the Vega IGP generation under the Raven Ridge codename. Both are fabricated on the same 14 nm process at GlobalFoundries, so the underlying transistor technology is identical.

The silicon itself is quite different in scale. The RX 550X uses the Lexa chip, which contains 2,200 million transistors on a 103 mm² die, giving it a transistor density of 21.4 million per square millimeter. The Vega 8 uses the Raven chip, which is a much larger 210 mm² die with 4,940 million transistors, resulting in a density of 23.5 million per square millimeter. However, the Raven chip is not just a GPU: it is an APU that also contains CPU cores, which is why its die size and transistor count are so much higher.

The memory architecture is a fundamental differentiator. The RX 550X has 4 GB of dedicated GDDR5 memory on a 128-bit bus, providing 96.00 GB/s of bandwidth. The Vega 8 uses system shared memory, meaning its bandwidth is system dependent and its memory size is whatever the host system allocates. This is the single largest practical difference between the two, as dedicated memory ensures consistent performance regardless of what the CPU is doing.

The compute units are configured identically in terms of raw resources: both have 512 shading units and 32 texture mapping units. The key difference lies in the render output units, where the RX 550X has 16 ROPs while the Vega 8 has only 8. This explains the pixel rate disparity: the RX 550X achieves 18.93 GPixel/s, while the Vega 8 manages only 8.80 GPixel/s. The texture rates are closer, with the RX 550X at 37.86 GTexel/s and the Vega 8 at 35.20 GTexel/s.

Clock behavior also differs. The RX 550X has a base clock of 1100 MHz and a boost clock of 1183 MHz, with memory running at 1500 MHz or 6 Gbps effective. The Vega 8 has a very low base clock of 300 MHz but boosts to 1100 MHz, which is a much wider dynamic range typical of an integrated part that needs to conserve power when idle. The FP32 throughput is close, with the RX 550X at 1,211.4 GFLOPS and the Vega 8 at 1,126.4 GFLOPS. The Vega 8 has an advantage in FP16, where it can reach 2.253 TFLOPS using a 2:1 ratio, while the RX 550X is capped at 1,211.4 GFLOPS with a 1:1 ratio.

Head-to-Head Benchmarks

The OpenCL benchmark is the closest contest between these two parts. The RX 550X scores 9662, which is 9.5% higher than the Vega 8’s 8822. This result indicates that in raw compute workloads that are not heavily dependent on memory bandwidth or ROP throughput, the two GPUs are relatively similar. The identical shading unit and TMU counts contribute to this parity, and the Vega 8’s higher boost clock relative to its base helps it stay competitive.

The Vulkan benchmark tells a very different story. The RX 550X scores 11299, which is a massive 38.9% higher than the Vega 8’s 8134. This is the largest performance gap in the entire comparison. The discrete card’s dedicated GDDR5 memory with 96.00 GB/s of bandwidth is likely a major factor here, as Vulkan workloads tend to be more memory-intensive and better optimized to take advantage of dedicated VRAM. The Vega 8’s reliance on system shared memory creates a bottleneck that the RX 550X does not have to contend with.

The average benchmark scores in the database confirm the trend. The RX 550X has an average score of 10481, while the Vega 8 averages 9221. The RX 550X’s closest rivals in the database include the NVIDIA Tesla C2075 at 10400 (0.8% behind), the AMD Radeon R9 M275X at 10582 (1% ahead), the AMD Radeon RX 6500M at 10362 (1.2% behind), and the AMD Radeon RX 6600S at 10629 (1.4% ahead). The Vega 8’s closest rivals are the AMD Radeon 890M at 9210 (0.1% behind), the NVIDIA GeForce GTX 960 at 9273 (0.6% ahead), the NVIDIA GeForce GTX 465 at 9294 (0.8% ahead), and the NVIDIA GeForce GTX 850M at 9302 (0.9% ahead).

FAQ

Q: Which GPU has more shading units?

A: Both the AMD Radeon RX 550X and the AMD Radeon Vega 8 have exactly 512 shading units.

Q: Does the RX 550X have dedicated memory?

A: Yes, the RX 550X has 4 GB of GDDR5 memory on a 128-bit bus with 96.00 GB/s of bandwidth. The Vega 8 uses system shared memory, making its bandwidth system dependent.

Q: What is the biggest performance difference between the two?

A: The largest gap is in the Geekbench Vulkan test, where the RX 550X scores 11299 versus the Vega 8’s 8134, a 38.9% advantage for the discrete card.

Q: Are these GPUs still in production?

A: No, both are listed as end-of-life in the database. The RX 550X was released on December 15, 2018, and the Vega 8 was released on February 11, 2018.

Q: Which GPU has a higher power draw?

A: The RX 550X has a TDP of 50 W, while the Vega 8 has a TDP of 25 W. The Vega 8 is an integrated part, so it does not require a separate power connector.

Q: Do both support modern graphics APIs?

A: Yes, both support DirectX 12, OpenGL 4.6, and Vulkan 1.3. The Vega 8 supports DirectX 12 at feature level 12_1, while the RX 550X supports DirectX 12 at feature level 12_0.

Specification Differences

The two GPUs differ in nearly every major specification category. The architecture is different: GCN 4.0 for the RX 550X versus GCN 5.0 for the Vega 8. The chip names are different, with the RX 550X using Lexa and the Vega 8 using Raven. The generation labels are also distinct, with the RX 550X belonging to the Polaris RX 500X family and the Vega 8 belonging to the Vega IGP Raven Ridge family.

The physical silicon is vastly different in size and complexity. The RX 550X has 2,200 million transistors on a 103 mm² die, while the Vega 8 has 4,940 million transistors on a 210 mm² die. This is because the Raven chip integrates CPU cores alongside the GPU, whereas the Lexa chip is a pure graphics processor.

Memory configuration is a major divergence. The RX 550X has 4 GB of GDDR5 with a 128-bit bus and 96.00 GB/s bandwidth. The Vega 8 uses system shared memory with system dependent bandwidth. The clocks also differ: the RX 550X runs at 1100 MHz base and 1183 MHz boost, while the Vega 8 runs at 300 MHz base and 1100 MHz boost.

The render output units differ, with the RX 550X having 16 ROPs and the Vega 8 having 8. This leads to a pixel rate of 18.93 GPixel/s for the RX 550X versus 8.80 GPixel/s for the Vega 8. The texture units are the same at 32, and the texture rates are close at 37.86 GTexel/s versus 35.20 GTexel/s. The FP32 performance is 1,211.4 GFLOPS for the RX 550X and 1,126.4 GFLOPS for the Vega 8, but the Vega 8 has higher FP16 throughput at 2.253 TFLOPS versus 1,211.4 GFLOPS.

Power and physical requirements are also different. The RX 550X has a 50 W TDP, is dual-slot, and requires no power connectors, but the database suggests a 250 W PSU. The Vega 8 has a 25 W TDP and is an IGP, meaning it uses no slot space, has no power connectors, and no suggested PSU. The bus interface is PCIe 3.0 x8 for the RX 550X versus IGP for the Vega 8. The RX 550X has a length of 145 mm and provides display outputs of 1x DVI, 1x HDMI 2.0b, and 1x DisplayPort 1.4a, while the Vega 8’s display outputs are motherboard dependent.

The Verdict

The choice between these two parts is not really a choice for most users. The AMD Radeon RX 550X is the superior performer in every benchmark category, with a 9.5% lead in OpenCL and a 38.9% lead in Vulkan. Its dedicated 4 GB of GDDR5 memory with 96.00 GB/s bandwidth, double the ROP count, and higher pixel rate make it the better option for anyone building a desktop system with a free PCIe slot and a 250 W power supply.

The AMD Radeon Vega 8 is the right choice only when you consider the entire platform. It is an integrated part, meaning it comes with the CPU and requires no additional hardware. Its 25 W TDP is half that of the RX 550X, and it needs no power connectors. For a compact, low-power system where the CPU is already a Raven Ridge part, the Vega 8 provides a usable level of graphics performance at no extra cost. Its 45th percentile ranking and average score of 9221 show that it is not far behind the RX 550X in the grand scheme, trailing by only 13.7% in average score.

The data points to a simple conclusion. If you need the best graphics performance and can accommodate a discrete card, the RX 550X wins outright. If you need an all-in-one CPU with integrated graphics and prioritize power efficiency and simplicity, the Vega 8 is the only option that makes sense. The RX 550X is a dedicated performer, while the Vega 8 is a capable companion to a processor, and the database shows exactly why that distinction matters.