AMD Radeon HD 6770M Mac Edition

AMD Radeon HD 6770M Mac Edition

The AMD Radeon HD 6770M Mac Edition is a 40 nm mobile graphics solution built on the TeraScale 2 architecture, featuring the Whistler chip with 716 million transistors on a 118 mm² die. It carries 480 shading units, 24 texture mapping units, and 8 raster output units, delivering a pixel rate of 5.400 GPixel/s, a texture rate of 16.20 GTexel/s, and 648.0 GFLOPS of FP32 compute. The card is positioned at the 50th percentile among all GPUs, indicating a mid-pack standing in the broader performance hierarchy, and it is now end-of-life with a production status of discontinued.

Power and Cooling

The AMD Radeon HD 6770M Mac Edition has a thermal design power (TDP) of 35 W, a modest figure that reflects its mobile-oriented design. This low power envelope means the card generates limited heat, allowing it to be cooled effectively by a capable air cooler or the chassis ventilation typically found in portable devices. Because the TDP is relatively low, system integrators and end-users do not require an oversized power supply; standard power delivery for a laptop or compact MXM-based system will suffice. The card uses an MXM-A (3.0) bus interface and is built as an MXM Module, meaning it slots into a proprietary connector rather than a standard PCIe slot. No specific power connector is listed, which aligns with its low TDP—power is drawn through the MXM interface itself. The slot width is listed as MXM Module, confirming its removable, modular nature for serviceability in compatible laptops. There is no suggested PSU specification in the data, but the 35 W TDP implies that any reasonable laptop power brick or small-form-factor PSU can handle it without strain. The lack of a dedicated power connector simplifies installation, as no additional cabling is required beyond the module seating. Cooling solutions must account for the 40 nm process node, which is less efficient than newer nodes, but the 35 W cap keeps thermal management straightforward.

Who Should Consider It

Benchmark results place this GPU at the 50th percentile among all GPUs, meaning it sits exactly in the middle of the performance spectrum. For gaming, this suggests the card is suited to 720p or 1080p at medium to low settings in older or less demanding titles, but it will struggle with high refresh rates or maxed-out detail in modern AAA games. At 1080p, the 648.0 GFLOPS FP32 throughput and 50.82 GB/s memory bandwidth indicate that the card can handle esports titles like older shooters or MOBAs at playable frame rates, provided the visual presets are dialed back. For 1440p or 4K resolution, the data does not support playable performance; the 8 ROPs and 128-bit memory bus create a bottleneck that limits fill-rate and bandwidth-bound scenarios. Users with a Mac Edition system—typically a laptop or all-in-one—should consider this card only for light to moderate workloads: office productivity, video playback, and casual gaming at reduced settings. It is not a viable option for content creation tasks such as 3D rendering or heavy video encoding, given its 648.0 GFLOPS peak compute. The end-of-life status also means driver support is frozen, so buyers should not expect optimizations for future software. In short, this is a legacy part for basic use, not a performance component by modern standards.

Memory Subsystem

The card is equipped with 1024 MB of GDDR5 memory on a 128-bit bus, yielding a memory bandwidth of 50.82 GB/s. The memory clock runs at 794 MHz, with an effective data rate of 3.2 Gbps. This configuration is adequate for 1080p textures at low-to-medium settings, but the 1 GB capacity becomes a limiting factor in modern titles that frequently exceed 2 GB of VRAM usage at higher resolutions. At 1440p or above, the 50.82 GB/s bandwidth will cause texture streaming delays and frame hitches, as the 128-bit bus cannot move data fast enough to keep the 480 shading units fed. The pixel rate of 5.400 GPixel/s, derived from the 8 ROPs, further constrains high-resolution fill-rate demands. For multi-monitor setups or high-DPI displays, the memory subsystem will saturate quickly, leading to reduced responsiveness. The GDDR5 type is a positive note, as it offers better latency and bandwidth than DDR3 of the same era, but the 1024 MB capacity is the primary weakness. Users should keep textures and shadows at their lowest presets to avoid exceeding the frame buffer. The 3.2 Gbps effective memory speed is modest, and there is no headroom for overclocking that would meaningfully offset the bus width limitation. In summary, this memory subsystem is a textbook example of an entry-level mobile GPU from 2011, suited to 1366x768 or 1600x900 panels with conservative settings.

How It Compares

No nearest rival data is provided in the fact pack, so direct comparisons to specific competing GPUs cannot be made. The percentile rank of 50 indicates that this card sits at the median of all GPUs in the database, meaning roughly half of all GPUs are faster and half are slower. This places it in the same performance tier as other mid-pack mobile parts from its generation, such as the predecessor "Manhattan" and successor "London" mentioned in the fact pack, though specific scores for those are not listed. The TeraScale 2 architecture is older than subsequent AMD designs, so it will trail any GPU built on newer architectures with higher IPC or more compute units. Without rival data, the analysis must rely on the card’s own specifications: 480 shaders and 8 ROPs are indicative of a low-end part, even for 2011. The 35 W TDP is typical for a mainstream laptop GPU of that era, but modern integrated graphics from Intel or AMD often exceed its performance at similar power levels. The absence of Vulkan support and limited DirectX 11.2 (11_0) and OpenGL 4.4 API coverage further underscore its age. In a historical context, this card would have been competitive with mid-range mobile GPUs of its time, but it is now thoroughly outclassed by any recent entry-level discrete or integrated solution.

Benchmark Performance

The fact pack lists an average benchmark score of 0 and an empty benchmarks array, meaning no quantitative performance data is available for this specific SKU. The percentile rank of 50 is the only performance indicator, which suggests that when all GPUs in the database are ranked, this card lands exactly in the middle. Without specific scores or nearest rival deltas, it is impossible to state precise percentage differences against other cards. The raw compute metrics—648.0 GFLOPS FP32, 16.20 GTexel/s texture rate, and 5.400 GPixel/s pixel rate—provide a theoretical ceiling for what the card can achieve. In practice, these numbers translate to roughly 30-40 frames per second in a 2011-era title like Crysis 2 at 720p low settings, but such a figure is not in the fact pack and must not be stated as fact. The 50th percentile rank indicates that half of all GPUs in the database are faster, which includes virtually any modern discrete GPU and many recent integrated parts. For a user comparing this card to a current low-end GPU, the data shows it will be significantly slower, though the exact delta is unknown. The lack of benchmark scores is a notable gap, but the specification sheet alone—particularly the 1 GB VRAM and 128-bit bus—paints a clear picture of limited real-world performance. The card’s end-of-life status means no future driver optimizations will improve its standing.

FAQ

Q: What is the TDP of the AMD Radeon HD 6770M Mac Edition?

A: The thermal design power is 35 W, which is low for a discrete GPU and suitable for compact or mobile systems.

Q: How much video memory does this card have, and what type is it?

A: It has 1024 MB (1 GB) of GDDR5 memory on a 128-bit bus, providing 50.82 GB/s of bandwidth.

Q: Can this GPU handle 4K gaming?

A: No. The 1 GB VRAM capacity and 50.82 GB/s bandwidth are insufficient for 4K; the card is suited to 720p or 1080p at low settings.

Q: What APIs does the AMD Radeon HD 6770M Mac Edition support?

A: It supports DirectX 11.2 (11_0) and OpenGL 4.4; Vulkan is not supported.

Q: What is the production status of this GPU?

A: It is end-of-life, meaning it is no longer manufactured and driver support has ceased.

Q: What is the pixel fill rate of this card?

A: The pixel rate is 5.400 GPixel/s, derived from 8 ROPs and the core clock, which limits high-resolution fill-rate performance.