ATI Radeon HD 4890

The ATI Radeon HD 4890, built on the RV790 chip and the TeraScale architecture, occupies a specific historical niche as an end-of-life product from the Radeon R700 generation. Fabricated on a 55 nm process at TSMC with 959 million transistors on a 282 mm² die, this card was positioned as a high-performance part in its era. With a launch MSRP of 249 USD, the benchmark data places it at the 50th percentile of all GPUs, indicating a mid-pack standing in the broader historical performance landscape.

Benchmark Performance

The Radeon HD 4890's compute capabilities are defined by its 800 shading units, 40 texture mapping units, and 16 raster operation pipelines. The raw arithmetic throughput reaches 1,360.0 GFLOPS of FP32 compute, a figure that was substantial for its time but is modest by contemporary standards. The texture fill rate is 34.00 GTexel/s, while the pixel rate is 13.60 GPixel/s. These figures suggest a card designed for 1080p gaming in its heyday, with the shading unit count providing a solid foundation for the DirectX 10.1 workloads that were prevalent at release.

In terms of rasterization throughput, the 13.60 GPixel/s pixel rate is a direct function of the 16 ROPs operating at the reference clock speeds. This places the HD 4890 in a performance tier that is roughly comparable to other high-end cards of the late 2000s, though the lack of nearest rival data in the fact pack prevents a precise percentage-based comparison. The FP32 performance of 1,360.0 GFLOPS indicates that the card was heavily optimized for shader-bound scenarios, which was a hallmark of the TeraScale architecture. The 50th percentile ranking suggests that while the card was not a flagship, it outperformed half of all GPUs ever released, a testament to its longevity in the benchmark database.

The absence of benchmark scores and nearest rival entries in the data means that performance analysis must rely solely on the architectural specifications. The 800 shading units are organized in a manner that allows for efficient execution of the 10_1 shader model, and the 40 TMUs ensure that texture-heavy scenes are handled without bottlenecking the shader array. The 16 ROPs, while modest in number, are paired with a GDDR5 memory interface that mitigates potential bandwidth constraints, as detailed in the next section.

Memory Subsystem

The Radeon HD 4890 is equipped with 1024 MB of GDDR5 memory, which was a significant capacity at launch. The memory operates at 975 MHz, translating to 3.9 Gbps effective data rate. This is paired with a 256-bit memory bus, resulting in a peak bandwidth of 124.8 GB/s. This bandwidth figure is critical for high-resolution gaming, as it determines how quickly textures and frame buffers can be accessed. For its generation, 124.8 GB/s was a competitive figure, ensuring that the 16 ROPs were not starved for data.

The 256-bit bus width is a key architectural decision, as it provides a balance between memory capacity and cost. The GDDR5 type offers higher data rates per pin compared to GDDR3, allowing the HD 4890 to achieve its 124.8 GB/s bandwidth without requiring a wider 512-bit interface. This bandwidth is sufficient to support the 1,360.0 GFLOPS compute throughput, as shader operations often require concurrent memory access. At resolutions above 1080p, the 1024 MB capacity may become a limiting factor, as modern textures and render targets can exceed this size. However, within its contemporary context, the memory subsystem was well-balanced.

The effective 3.9 Gbps memory clock is a notable specification, as it represents a high-frequency operation point for GDDR5 modules of that era. This helps the card maintain its 124.8 GB/s bandwidth even with a relatively narrow 256-bit bus. The pixel rate of 13.60 GPixel/s is also dependent on memory bandwidth, and the 124.8 GB/s figure ensures that the ROPs can sustain their output without stalls. For users targeting high-resolution displays, the data indicates that the HD 4890 was adequate for its time, but the 1024 MB capacity would require texture quality reductions in later titles.

Ray Tracing and Feature Set

The Radeon HD 4890 does not feature dedicated ray tracing cores or tensor cores, as these were not part of the TeraScale architecture. The card relies entirely on its 800 unified shaders for all compute and graphics tasks. Ray tracing, if attempted, would be executed in a non-accelerated manner through the shader units, which would result in extremely poor performance. The architectural focus is on traditional rasterization, with the 10_1 DirectX support providing advanced features like early-z rejection and improved shader control flow.

The API support is limited to DirectX 10.1 (shader model 10_1) and OpenGL 3.3. There is no Vulkan support, as this API was released after the card's production period. The DirectX 10.1 feature set includes capabilities such as cube map arrays and improved texture sampling, which were incremental updates over the base DirectX 10 specification. OpenGL 3.3 support allows for compatibility with older Linux and Windows applications, but modern titles that require DirectX 11 or 12, or Vulkan, will not run on this hardware. The lack of dedicated RT and tensor cores means that any modern feature set involving hardware-accelerated ray tracing or AI-based upscaling is entirely absent.

The shading units are capable of FP32 compute, which is essential for the 10_1 shader model, but there is no FP16 support listed, indicating a potential performance penalty for workloads that could utilize half-precision arithmetic. The card's feature set is thus firmly anchored in the late-2000s era, with no forward-looking capabilities. The display outputs—2x DVI and 1x S-Video—further confirm its age, as there are no DisplayPort or HDMI outputs available without adapters. The PCIe 2.0 x16 bus interface provides sufficient bandwidth for the card's data transfer needs, but it is not compatible with newer PCIe 4.0 or 5.0 system-level optimizations.

Power and Cooling

The ATI Radeon HD 4890 has a thermal design power (TDP) of 190 W, which is a substantial power draw for its performance class. This TDP dictates the cooling solution: a dual-slot cooler is required to manage the heat output effectively. The card's physical dimensions are 241 mm in length (9.5 inches), 111 mm in height (4.4 inches), and 40 mm in width (1.6 inches), which confirms its dual-slot design. The dual-slot form factor ensures that the heatsink and fan assembly have sufficient surface area to dissipate the 190 W of heat.

Power is delivered via two 6-pin PCIe power connectors. This connector configuration is standard for high-power cards of that generation, and the system PSU recommendation is 450 W. This 450 W figure is the minimum suggested power supply rating, indicating that a robust PSU with adequate 12V rail capacity is necessary for stable operation. The dual 6-pin connectors provide up to 150 W of additional power beyond the 75 W supplied by the PCIe x16 slot, totaling 225 W of available power, which comfortably covers the 190 W TDP. Users must ensure their power supply has the appropriate connectors, as adapting from other connector types may not be recommended.

The cooling solution's efficiency is not quantified in the data, but the dual-slot width and 40 mm thickness suggest a substantial heatsink with a large fan. The 190 W TDP is a key specification for system integration, as it affects case airflow and ambient temperature. The 450 W PSU recommendation is a minimum, and systems with high-end CPUs or multiple drives would likely require a higher-rated unit. The power connectors are a critical compatibility point, as older power supplies may lack the necessary 6-pin PCIe connectors.

How It Compares

The data provided does not include any nearest rival comparisons, benchmark scores, or deltaPct values. Consequently, a direct quantitative comparison to specific competing graphics cards is not possible from the available facts. The card sits at the 50th percentile of all GPUs, which is a neutral position, but without named rivals, the analysis must remain at the level of general architectural context.

Without rival names, the HD 4890's position must be inferred from its specifications. Its 1,360.0 GFLOPS FP32 throughput and 124.8 GB/s bandwidth place it in the upper mid-range of its generation. The 800 shading units are a high count, suggesting it was aimed at enthusiasts seeking high frame rates in DirectX 10 titles. The 190 W TDP is a clear indicator of its performance ambitions, as lower-tier cards would draw significantly less power. The 50th percentile ranking implies that it has been surpassed by the majority of subsequent GPUs, but it remains ahead of many low-end and integrated solutions.

The lack of nearest rival data is a significant gap. In the absence of such figures, potential buyers or researchers should focus on the architectural specifications: the GDDR5 memory, the 128-bit memory bus, and the 10_1 DirectX support. These are the defining characteristics. The card's production status as end-of-life and its release date in early 2009 mean that it is a legacy product. Its successor, Evergreen, would offer architectural improvements, while its predecessor, Radeon R600, had lower performance. The 45 nm process node of the RV790 chip is a mature implementation, and the 282 mm² die size is relatively large, indicating a complex design. Ultimately, the HD 4890 is a historical artifact whose performance is best understood in the context of its 2009 release window, not against modern or even near-contemporary rivals that are absent from the data.