AMD Radeon HD 7770 GHz Edition

The AMD Radeon HD 7770 GHz Edition is a 28 nm Southern Islands part built on GCN 1.0 architecture, fabricated by TSMC with 1,500 million transistors on a 123 mm² die. It carries 640 shading units, 40 texture mapping units, and 16 ROPs, paired with 1024 MB of GDDR5 memory on a 128-bit bus. In the benchmark database, this card sits at the 50th percentile of all GPUs, placing it exactly at the median of the field.

Benchmark Performance

The database records no aggregate benchmark score for the HD 7770 GHz Edition — the avgBenchmarkScore field is 0 — but its percentile placement of 50 provides the positioning anchor. A 50th percentile ranking means the card performs at the midpoint of every GPU tracked in the database: half of all cards are faster, half are slower. That is a remarkably central position for a card from the Southern Islands generation, and it speaks to the balanced design of the GCN 1.0 architecture at this tier.

The compute figures support this mid-pack standing. FP32 throughput is 1,280.0 GFLOPS, delivered by 640 shading units at the card's operating clocks. Texture fill rate is 40.00 GTexel/s from 40 TMUs, and pixel throughput is 16.00 GPixel/s from 16 ROPs. Memory bandwidth is 72.00 GB/s, drawn from a 128-bit interface running GDDR5 at 1125 MHz (4.5 Gbps effective). These are balanced numbers — no single subsystem dramatically outpaces the others, which is typical of a card engineered for consistent, predictable frame delivery rather than peak bursts.

Because there are no rival scores recorded in the nearestRivals field, direct percentage deltas cannot be computed from this data. The percentile is the only comparative metric available, and it tells a clear story: the HD 7770 GHz Edition is a median performer. In practical terms, that means it should handle games of its era at moderate detail settings, with the 1 GB frame buffer acting as a constraint at higher texture loads. The 16.00 GPixel/s pixel rate and 40.00 GTexel/s texture rate suggest the card is well matched to its 72.00 GB/s memory bandwidth. When a workload is texture-bound, the 40 TMUs can be fed without stalling; when pixel-bound, the 16 ROPs have enough bandwidth to write results. The 1,280.0 GFLOPS FP32 figure indicates the card can also accelerate compute-style effects, a benefit of the GCN 1.0 architecture's unified shader design.

The memory subsystem deserves particular attention. A 1024 MB frame buffer on a 128-bit bus with 72.00 GB/s of bandwidth was a common configuration for the lower-midrange segment in the early 2010s. The 4.5 Gbps effective memory speed is achieved through the GDDR5 standard, and the 1125 MHz memory clock is the reference setting. For the card's intended workloads, this configuration provides enough bandwidth to keep the 640 shaders occupied, but it will become a bottleneck in texture-heavy scenes that exceed the 1 GB capacity.

How It Compares

With no nearest rivals listed in the database, the comparison must be drawn from the percentile field and the generational context. The HD 7770 GHz Edition sits at the 50th percentile of all GPUs, which is the definition of a median card. It is neither a budget afterthought nor a performance leader; it occupies the exact middle of the distribution.

The card's predecessor is the Northern Islands generation, and its successor is Sea Islands. Within that lineage, the HD 7770 GHz Edition represents the entry point of the Southern Islands family (HD 7700). The GCN 1.0 architecture was a significant departure from the VLIW-based Northern Islands designs, introducing a unified shader model that scaled better with compute workloads. The 28 nm process node, shared with the rest of the Southern Islands lineup, allowed 1,500 million transistors to fit on a 123 mm² die — a transistor density of 12.2M per square millimeter. This density figure is a useful indicator of the manufacturing efficiency at the time, and it directly enabled the card's modest 80 W power envelope.

Against the broader GPU field, the 50th percentile placement means the card outperforms exactly half of the tracked GPUs. For a card released in February 2012, that positioning reflects both its contemporary competence and the inevitable march of subsequent generations. The 1 GB memory capacity and 128-bit bus are modest by later standards, but they were appropriate for the card's target segment at launch. The card's 210 mm (8.3 inches) length and dual-slot footprint are also typical of the era, fitting comfortably in the majority of desktop chassis.

Ray Tracing and Feature Set

The HD 7770 GHz Edition has no dedicated ray tracing cores and no tensor cores — both fields are null in the specification. This is expected for a GCN 1.0 architecture part from 2012; hardware-accelerated ray tracing and tensor processing were not part of the GPU feature set at that time. Any ray tracing workload would have to run on the general-purpose shading units, which are limited to 640 in this card. The practical implication is that the card cannot accelerate ray-traced effects or AI-based upscaling, and users who require those features must look elsewhere.

The API support is more forward-looking. The card supports DirectX 12 at feature level 11_1, which means it can run DirectX 12 titles but only with the feature set of DirectX 11.1. It also supports OpenGL 4.6 and Vulkan 1.2.170, giving it access to modern graphics APIs even though the underlying hardware is from an earlier era. The Vulkan 1.2.170 support is particularly notable for a 2012 card, as it allows the GPU to run recent Vulkan-based titles and engines, albeit with the performance constraints of its 640 shaders and 1 GB memory.

Display output is handled by one DVI port, one HDMI 1.4a port, and two mini-DisplayPort 1.2 connections. The dual mini-DisplayPort outputs support multi-monitor setups, and the HDMI 1.4a port can carry audio and video to a single display. The PCIe 3.0 x16 bus interface provides sufficient bandwidth for the card's 72.00 GB/s memory subsystem, ensuring that data transfers between the CPU and GPU do not become a bottleneck. The combination of four display outputs gives the card a level of multi-monitor flexibility that was uncommon at its price tier.

Power and Cooling

The HD 7770 GHz Edition has a TDP of 80 W, which is modest by any standard. The card requires a single 6-pin power connector and the suggested power supply rating is 250 W. This makes the card suitable for systems with relatively small power supplies, provided they have a 6-pin PCIe power lead. The dual-slot cooler design is larger than a single-slot solution, but the 80 W TDP means the thermal load is manageable; the card measures 210 mm (8.3 inches) in length, which fits in most mid-tower cases.

The 28 nm process node from TSMC is a key enabler of the low power draw. With 1,500 million transistors on a 123 mm² die, the transistor density of 12.2M per square millimeter is modest by modern standards, but it was efficient for 2012. The 80 W TDP means the card does not require auxiliary cooling beyond the dual-slot heatsink and fan assembly. The single 6-pin connector is the only power input, and the 250 W PSU recommendation leaves headroom for the rest of the system components. The launch MSRP was 159 USD, which positioned the card in the lower-midrange segment at release. The power characteristics — 80 W TDP, 250 W PSU suggestion, one 6-pin connector — are consistent with that positioning.

Who Should Consider It

The HD 7770 GHz Edition is a card for users who need a functional GPU with modern API support at a modest performance level. The 50th percentile placement means it will handle games that are not demanding on fill rate or memory capacity. The 1 GB GDDR5 frame buffer, 128-bit bus, and 72.00 GB/s bandwidth are the limiting factors: games that require more than 1 GB of video memory will either fail to load or suffer from texture thrashing.

For resolution and settings guidance, the card's 16.00 GPixel/s pixel rate and 40.00 GTexel/s texture rate suggest it is best suited to lower resolution and lower detail presets. At higher detail settings, the 1,280.0 GFLOPS FP32 throughput and 640 shading units will struggle with modern shader complexity. The card is better matched to older titles or esports-style games with light graphical demands. The 80 W TDP and 250 W PSU recommendation make it an easy drop-in for office desktops or home theater PCs that have a spare 6-pin connector.

The API support is the card's strongest modern asset. DirectX 12 (11_1), OpenGL 4.6, and Vulkan 1.2.170 mean the card can run a wide range of current software, even if frame rates are modest. Users with a 250 W power supply and a single 6-pin connector can install this card without upgrading their PSU, making it a drop-in option for older systems. The absence of ray tracing and tensor cores means the card is not suitable for workloads that depend on those features, such as DLSS-style upscaling or hardware-accelerated ray-traced lighting. For users who need those capabilities, a different GPU is required. For users who simply need a working graphics card with broad API compatibility and low power draw, the HD 7770 GHz Edition remains a viable, if dated, option.