ATI Radeon HD 4770

The ATI Radeon HD 4770, built on the 40 nm RV740 chip using AMD’s TeraScale architecture, occupies a distinct middle ground in the Radeon R700 generation. With 640 shading units, 32 texture mapping units, and 16 render output units, this dual-slot card delivers a peak FP32 throughput of 960.0 GFLOPS, a texture rate of 24.00 GTexel/s, and a pixel rate of 12.00 GPixel/s. Its benchmark standing places it at the 50th percentile among all GPUs, meaning it sits exactly at the median of the performance distribution—neither a standout nor a laggard in the broader hardware landscape.

Benchmark Performance

The HD 4770’s performance profile is best understood through its raw computational metrics rather than direct rival comparisons, as the available data does not include nearestRivals entries with specific score deltas. The 960.0 GFLOPS FP32 figure indicates a card that can handle mainstream gaming workloads of its era, but the lack of benchmark scores and rival deltas means absolute performance must be inferred from the computational rates. The 24.00 GTexel/s texture fill rate and 12.00 GPixel/s pixel rate suggest balanced throughput for 720p and early 1080p gaming, though the 50th percentile ranking confirms that half of all GPUs in the database outperform it.

Relative to its predecessor, the Radeon R600, the HD 4770 represents a generational step forward in efficiency and feature support, but the data does not quantify that improvement in percentage terms. The successor, Evergreen, would later surpass it, yet within the R700 family, the HD 4770’s position is defined by its mid-pack percentile. Without direct rival scores, the practical interpretation is that this card delivers competent 30-60 FPS performance in less demanding titles, but struggles with contemporary high-end games at maximum settings. The 40 nm process node and 826 million transistors on a 137 mm² die yield a transistor density of 6.0M / mm², which is modest by later standards but was competitive at launch.

The absence of benchmark data in the FACT PACK means no synthetic or real-world score can be cited; instead, the FP32, texture, and pixel rates serve as the primary performance indicators. These numbers collectively point to a card that is roughly on par with other mid-range offerings of its time, though the 50th percentile ranking tempers expectations—it is not a high-performance part, but it is far from the bottom of the stack.

Memory Subsystem

The HD 4770 comes equipped with 512 MB of GDDR5 memory on a 128-bit bus, producing a memory bandwidth of 51.20 GB/s. The effective memory clock runs at 3.2 Gbps, which is a notable advantage of GDDR5 over older DDR3 or GDDR3 solutions. For its target resolution range, this bandwidth is sufficient to feed the shading units without creating a severe bottleneck. At 1080p, however, the 512 MB capacity becomes a limiting factor—many games of the late-2000s era required more than 512 MB for high-resolution textures, and the 128-bit bus further constrains how quickly data can be moved to and from the frame buffer.

The 51.20 GB/s bandwidth translates to roughly 1.6 GB of data per frame at 30 FPS, which is adequate for lower-detail settings but will cause stuttering or texture pop-in when VRAM is exceeded. The 12.00 GPixel/s pixel rate means the card can push a decent number of pixels, but the memory subsystem’s modest width and capacity will cap performance in memory-intensive scenarios. For resolutions above 1080p, the 512 MB frame buffer is clearly insufficient, and even at 1080p, users should expect to reduce texture quality. The 3.2 Gbps effective memory speed is a highlight, but it cannot compensate for the small capacity and narrow bus. In summary, the memory subsystem is balanced for 720p gaming and acceptable for 1080p with lowered settings, but it is the primary bottleneck for higher resolutions.

Power and Cooling

The HD 4770 carries a TDP of 80 W, which is modest by modern standards but was typical for a mid-range card in its generation. This power draw requires a single 6-pin power connector, and the suggested PSU rating is 250 W. For context, a typical system with a mid-range CPU and this GPU would operate comfortably within a 250 W power supply, leaving headroom for drives and peripherals. The dual-slot cooler design is necessary to dissipate the 80 W of heat effectively, though the card’s 203 mm length (8 inches) means it should fit in most standard mid-tower cases without clearance issues.

The 40 nm process node from TSMC contributes to the relatively low power consumption, as does the 826 million transistor count on a 137 mm² die. The thermal design is straightforward: a dual-slot heatsink and fan assembly handles the heat output, and the 6-pin connector ensures stable power delivery under load. The 250 W PSU recommendation is conservative, implying that the card is not power-hungry and can be paired with budget power supplies. There is no data on noise levels or cooling efficiency, but the 80 W TDP suggests a quiet operation under typical loads. The lack of a boost clock or variable power states in the FACT PACK means power management details are unavailable, but the fixed 80 W figure indicates a predictable power envelope.

Who Should Consider It

Given its 50th percentile ranking and computational metrics, the HD 4770 is best suited for users gaming at 720p or 1080p with medium to low settings. The 960.0 GFLOPS FP32 performance and 51.20 GB/s bandwidth are adequate for older titles, esports games, or indie releases, but modern AAA games will require significant graphical compromises. The 512 MB VRAM is the deciding factor—any game with high-resolution texture packs will exceed this capacity, causing performance drops. For 720p gaming, the card can handle most titles from its launch era (2009) at high settings, but for 1080p, users should stick to lower detail presets or older games.

The 50th percentile ranking means it outperforms half of the GPUs in the database, which puts it in the lower-middle tier of overall performance. Users who primarily play competitive shooters or lightweight strategy games will find it sufficient, but those seeking high-fidelity experiences should look elsewhere. The 12.00 GPixel/s pixel rate supports a 60 Hz display at 720p without issue, but higher refresh rates or resolutions are beyond its reach. The card’s end-of-life production status further limits its appeal—it is a legacy part suitable for retro builds or budget HTPCs, not for modern gaming. In short, it is a viable option for low-resolution, low-settings gaming or as a display adapter for non-gaming workloads.

Ray Tracing and Feature Set

The HD 4770 does not include any ray tracing or tensor cores, as these technologies were not part of the TeraScale architecture. Instead, the card relies on traditional rasterization, with its 640 shading units handling all pixel and vertex processing. The API support is limited to DirectX 10.1 (with a shader model of 10_1) and OpenGL 3.3; there is no Vulkan support listed. This means the card cannot run any modern DirectX 12 or Vulkan titles, and even DirectX 11 games are unsupported unless they feature a DirectX 10.1 fallback path. The lack of ray tracing is expected for a GPU from 2009, but the absence of Vulkan limits its usability in current Linux environments or emulators.

The display outputs are limited to two DVI ports and one S-Video connector, which is dated—there is no HDMI or DisplayPort, requiring adapters for modern monitors. The PCIe 2.0 x16 interface provides sufficient bandwidth for the card’s memory subsystem, but it is backward compatible with older slots. The feature set is firmly anchored in its era, with no hardware-accelerated ray tracing, no tensor cores, and no modern API support. For users interested in retro gaming or running legacy software, the DirectX 10.1 and OpenGL 3.3 support cover most titles from the late 2000s. However, any attempt to use this card with contemporary applications will hit immediate software compatibility walls. The 50th percentile ranking reflects its historical performance, but its feature set ensures it remains a relic of its time.