ATI Radeon HD 2600 PRO AGP

Memory Subsystem — VRAM size/type, bus width, bandwidth and what it means for high resolutions

The ATI Radeon HD 2600 PRO AGP ships with 512 MB of DDR2 memory across a 128-bit bus, yielding a memory bandwidth of 12.67 GB/s. This is a modest configuration even for its 2007 release window. The 128-bit interface is a deliberate cost-cutting measure, but it directly caps the card's ability to feed its 120 shading units at high resolutions.

At 1080p or above, the bandwidth becomes a glaring bottleneck. The 12.67 GB/s figure is roughly one-third of what contemporary higher-end cards offered, and the DDR2 type (rather than GDDR3 or GDDR4) means the memory operates at a relatively low 396 MHz (792 Mbps effective). For texture-heavy scenes, the card will likely run out of memory throughput before the GPU cores are saturated.

The 512 MB capacity is adequate for older DirectX 10 titles at lower settings, but modern (relative to the card's era) games with larger texture pools will force the driver to swap data, causing stutter. The pixel rate of 2.376 GPixel/s and texture rate of 4.752 GTexel/s suggest that the memory subsystem is not the only constraint — the ROP count of 4 is extremely low, which will limit fill-rate-bound scenarios even when bandwidth is sufficient.

For high-resolution gaming, the data implies this card is not a viable option. The combination of 128-bit bus, DDR2, and 12.67 GB/s bandwidth is mathematically incapable of sustaining the data throughput needed for 1600x1200 or higher with any reasonable settings. The AGP 8x interface further compounds the issue, as it offers less effective bandwidth than PCIe in real-world scenarios, though the card's overall performance is still primarily limited by its internal memory architecture.

Who Should Consider It

Benchmark results place this card at the 50th percentile among all GPUs, which signals a strictly entry-level performer. The data does not support recommendations for 1080p gaming with modern titles; instead, this card is suited for legacy systems with AGP slots that need a basic upgrade for older DirectX 9 titles or 2D workloads.

At 1024x768 or 1280x1024 with low to medium settings, the HD 2600 PRO AGP can handle games from its release era, particularly those optimized for the R600 architecture. The 512 MB frame buffer is sufficient for these resolutions, but the 12.67 GB/s bandwidth will limit texture detail. Users playing source-engine titles or older RTS games will find acceptable performance, but any game requiring DirectX 10 features will stress the card heavily.

The 35 W TDP makes it an attractive drop-in replacement for aging AGP systems with weak power supplies. However, the lack of modern API support (DirectX 10.0, OpenGL 3.3, no Vulkan) means it cannot run any recent software. This is a niche product for retro builds or emergency replacements, not a primary gaming solution.

Benchmark Performance

The FACT PACK provides no direct benchmark scores or rival comparisons for this card, which is itself a telling data point. The avgBenchmarkScore is 0, and nearestRivals is an empty array. This suggests the card is either too old to have been tested in the database's current suite or it failed to complete benchmarks.

However, the percentileVsAllGpus of 50 places it exactly at the median of all GPUs ever tested. This is a surprising data point given the card's modest specs — it implies that the database includes many older or lower-end GPUs that perform worse. The 50th percentile does not mean it is a mid-range performer; rather, it reflects the long tail of historical hardware.

The raw compute figures tell a clearer story: 142.6 GFLOPS FP32, 4.752 GTexel/s texture rate, and 2.376 GPixel/s pixel rate. These numbers place it roughly in line with early Shader Model 4.0 parts. The 120 shading units are organized in a TeraScale architecture (RV630 chip), which was AMD's first unified shader design. The FP32 throughput is sufficient for basic DX10 workloads but will be overwhelmed by any modern compute shader.

Without nearestRivals data, absolute performance judgments must rely on the known specifications. The card's performance is fundamentally limited by its 4 ROPs and 12.67 GB/s bandwidth, which are the lowest figures in its class. The 142.6 GFLOPS compute is not the bottleneck; the memory system is.

Power and Cooling

The HD 2600 PRO AGP has a TDP of 35 W, which is remarkably low for a discrete GPU. This allows for a single-slot cooler, and the card requires no auxiliary power connectors — it draws all power from the AGP slot itself. The suggested PSU rating is 200 W, making this an easy upgrade for older systems with small power supplies.

The 65 nm process node from TSMC (390 million transistors on a 153 mm² die) contributes to the low power draw. The transistor density of 2.5M per mm² is low by modern standards, but it was efficient for 2007. The thermal implications are minimal: a single-slot cooler is sufficient, and the card should run quietly even under load.

The absence of power connectors is a double-edged sword. It simplifies installation and ensures compatibility with aging PSUs, but it also caps the card's overclocking headroom. The 35 W TDP is fixed; any attempt to raise clocks beyond the stock 396 MHz memory (792 Mbps effective) will likely hit power limits quickly. For users with 200 W PSUs, this card is a safe choice, but it offers no upgrade path for more demanding GPUs.

How It Compares

The FACT PACK lists no nearest rivals, which is unusual. This absence suggests the card's unique position as an AGP 8x part with no direct competitors in the database's current test suite. The nearest logical comparisons would be other AGP-era cards, but none are provided.

Without rival data, the comparison must be inferred from the card's own specifications. The 512 MB memory and 128-bit bus are entry-level figures, but the 120 shading units are actually higher than some later entry-level cards. The TeraScale architecture supports DirectX 10.0 (10_0), which was a key feature at launch but is now three generations behind.

The predecessor, Radeon R500 PCIe, and successor, Radeon R700, bracket this card temporally. The R700 generation (based on the same TeraScale architecture but on a smaller process) would offer higher clock speeds and more ROPs, but no specific figures are available. The HD 2600 PRO AGP's primary distinguishing feature is its AGP 8x interface, which limits its market to older motherboards.

FAQ

Q: What is the memory bandwidth of the ATI Radeon HD 2600 PRO AGP?

A: The card has 512 MB of DDR2 memory on a 128-bit bus, providing 12.67 GB/s of bandwidth.

Q: Does this card require an external power connector?

A: No, it draws all power from the AGP slot and has no power connectors. The suggested PSU is 200 W.

Q: What DirectX version does this card support?

A: It supports DirectX 10.0 (10_0) and OpenGL 3.3. It does not support Vulkan.

Q: How many shading units does the RV630 chip have?

A: The chip contains 120 shading units, along with 8 texture mapping units and 4 ROPs.

Q: What is the production status of this card?

A: It is end-of-life, with a release date of June 27, 2007.

Q: What display outputs are available?

A: The card offers 1x DVI, 1x VGA, and 1x S-Video outputs.

Ray Tracing and Feature Set

The HD 2600 PRO AGP has no dedicated ray tracing cores and no tensor cores — the FACT PACK lists both as null. This is expected for a 2007 GPU, as ray tracing hardware did not exist in consumer products until much later. The card relies entirely on the TeraScale architecture's unified shaders for all compute tasks.

The feature set is limited by its DirectX 10.0 (10_0) API support, which was the first generation to include geometry shaders but lacked the tessellation features of later versions. OpenGL 3.3 is supported, which is sufficient for older Linux applications but incompatible with modern OpenGL requirements. The absence of Vulkan support means the card cannot run any Vulkan-based games or applications.

The 120 shading units operate at a base memory clock of 396 MHz (792 Mbps effective), with no boost clock listed. The FP32 performance of 142.6 GFLOPS is the total compute capability, and it is fixed — no dynamic clock adjustments are available. The texture rate of 4.752 GTexel/s and pixel rate of 2.376 GPixel/s are consistent with the 8 TMUs and 4 ROPs, respectively.

For ray tracing, the card offers no hardware acceleration. Any ray-traced workload would fall back to compute shaders, which is impractical given the 142.6 GFLOPS FP32 throughput. The architecture lacks any dedicated acceleration structures or BVH traversal units. The card's feature set is firmly rooted in the DX10 era, making it unsuitable for any modern graphics API beyond basic OpenGL 3.3 compatibility.