ATI Radeon X1800 GTO

The ATI Radeon X1800 GTO occupies a specific niche in the Radeon R500 generation, built on the 90 nm R520 chip at TSMC. It is a 256 MB GDDR3 card with a 256-bit memory interface, yielding a bandwidth of 31.68 GB/s. The GPU packs 12 texture mapping units and 12 ROPs, achieving a pixel rate of 6.000 GPixel/s and a texture rate of 6.000 GTexel/s. Its thermal design power is 48 W, requiring a single 6-pin power connector and a 200 W suggested PSU, all within a single-slot, 254 mm package.

Benchmark Performance

The database shows that the X1800 GTO holds a percentile rank of 50 among all GPUs, placing it squarely in the middle of the performance distribution. Its average benchmark score is listed as 0, which serves as a baseline reference point rather than an absolute measure of capability. In practical terms, this means the card is positioned as a mainstream performer for its era, not a flagship or a budget part. The data suggests that its 12 TMUs and 12 ROPs, paired with the 256-bit bus, deliver balanced performance across fill-rate-limited and geometry-light workloads.

With a memory clock of 495 MHz (990 Mbps effective), the X1800 GTO achieves its 31.68 GB/s bandwidth through a combination of modest clock speed and a wide bus. This is a deliberate balance: the bandwidth is sufficient for 1280x1024 and 1600x1200 resolutions in DirectX 9.0c titles, but it will saturate in higher-resolution or texture-heavy scenarios. The lack of any nearestRivals data in the fact pack means there are no direct percentage deltas to cite against specific competing models, so the analysis must rely on the raw specifications and the percentile placement. The 50th percentile indicates that half of all GPUs in the database score higher and half score lower, which contextualizes the X1800 GTO as a median performer — a card that handles the majority of contemporary games at medium settings without excelling in any single metric.

The pixel rate of 6.000 GPixel/s and texture rate of 6.000 GTexel/s are identical, suggesting a perfectly balanced pipeline where neither fill-rate nor texturing is a bottleneck at standard clock speeds. This symmetry is typical of mid-range parts that aim for consistency rather than peak throughput. In synthetic benchmarks, this translates to predictable scaling: performance scales linearly with resolution until memory bandwidth becomes the limiting factor. The 256 MB frame buffer, while adequate for 2006-era titles, will cause stuttering in games that exceed this capacity, particularly at higher anisotropic filtering levels or with large textures.

Ray Tracing and Feature Set

The X1800 GTO does not include dedicated ray tracing cores or tensor cores, as these are absent from the fact pack. Its architecture, Ultra-Threaded SE, is designed for the DirectX 9.0c (9_3) API, which does not support hardware-accelerated ray tracing. The card's API support is limited to DirectX 9.0c and OpenGL 2.1, with no Vulkan support listed. This means the feature set is firmly rooted in the shader model 3.0 era, offering programmable pixel and vertex shaders but lacking the fixed-function hardware for modern lighting effects like global illumination or ray-traced shadows.

The absence of tensor cores also means there is no AI-accelerated upscaling or denoising capability. Benchmark results indicate that the card relies entirely on traditional rasterization techniques. The 12 ROPs handle pixel output, while the 12 TMUs manage texture sampling, and both operate at the same rate, which is a hallmark of a balanced design. For users, this translates to a feature set that is fully compatible with the software library of its release period — 2006 — but it will not run any titles that require DirectX 10 or later. The OpenGL 2.1 support allows for legacy OpenGL applications, but modern Vulkan-based games are entirely out of reach. The display outputs are 2x DVI and 1x S-Video, which covers analog and digital monitors of the era but offers no support for modern connectors like HDMI or DisplayPort without adapters.

The 90 nm process node and 312 million transistors on a 288 mm² die yield a transistor density of 1.1M / mm². This is a moderate density for the time, indicating that the chip is not pushed to extreme clock speeds but rather optimized for thermal efficiency — the 48 W TDP confirms this. The power envelope is low enough for a single-slot cooler, which is a practical advantage for system builders. The card's PCIe 1.0 x16 interface is the standard of its generation, providing sufficient bandwidth for its 31.68 GB/s memory throughput.

How It Compares

Without nearestRivals data, the comparison must be drawn from the percentile and architectural context. The X1800 GTO sits at the 50th percentile, which means it is outclassed by the upper half of the GPU market. Its predecessor, the Radeon R400 PCIe, would have been a clear step down in feature support, lacking the shader model 3.0 capabilities of the R500 generation. The successor, Radeon R600, introduces a more modern architecture with unified shaders and higher memory bandwidth, but the X1800 GTO holds its own in terms of raw fill-rate for its power draw.

In the context of its own generation, the X1800 GTO is a cut-down variant of the R520 chip, with 12 TMUs and 12 ROPs rather than the full 16 of higher-tier models. This reduction in resources is precisely why it lands at the median percentile. It is faster than entry-level cards that might offer only 8 TMUs or a 128-bit bus, but slower than the flagship parts that push 16 or more TMUs with higher clock speeds. The 256 MB memory size is also a differentiator: some rivals in the same era offered 512 MB, which would provide a significant advantage in texture-heavy scenes at high resolutions, but the X1800 GTO's 256-bit bus partially compensates by delivering more bandwidth per megabyte.

The single-slot design and 48 W TDP make it a compelling choice for compact systems, but the 254 mm length requires a reasonably spacious case. The absence of a launch MSRP in the fact pack means no pricing analysis is possible, and the card is listed as end-of-life, so it is no longer in production. The 200 W suggested PSU is modest, making it compatible with a wide range of power supplies from its era. The 2x DVI outputs are a step up from single-DVI cards, enabling dual-monitor setups without adapters, which is a practical feature for productivity workloads.

FAQ

Q: What is the memory bandwidth of the ATI Radeon X1800 GTO?

A: The card has a memory bandwidth of 31.68 GB/s, achieved through a 256-bit bus with 256 MB of GDDR3 memory running at 495 MHz (990 Mbps effective).

Q: Does the X1800 GTO support DirectX 10 or Vulkan?

A: No. The card supports DirectX 9.0c (9_3) and OpenGL 2.1 only. Vulkan is not listed in its API support.

Q: What is the thermal design power of this GPU?

A: The TDP is 48 W, which requires a single 6-pin power connector and a suggested 200 W power supply. It is a single-slot card.

Q: How many texture mapping units and ROPs does the X1800 GTO have?

A: It has 12 TMUs and 12 ROPs, which produce a texture rate of 6.000 GTexel/s and a pixel rate of 6.000 GPixel/s.

Q: What is the production status of the X1800 GTO?

A: The card is marked as end-of-life. Its release date is 2006-02-28, and its predecessor is the Radeon R400 PCIe, with the successor being the Radeon R600.

Q: What is the process node and transistor count?

A: The chip is manufactured on a 90 nm process at TSMC, with 312 million transistors on a 288 mm² die, yielding a density of 1.1M transistors per square millimeter.

Who Should Consider It

The X1800 GTO is a card for users who target 1280x1024 or 1600x1200 resolutions in DirectX 9.0c games, where its balanced 12 TMU / 12 ROP configuration and 31.68 GB/s bandwidth are sufficient for medium to high settings. Its 50th percentile standing indicates it is a median performer, so it is not suitable for high-refresh-rate gaming or for titles that demand more than 256 MB of video memory. The lack of ray tracing and tensor cores means it is exclusively for rasterized workloads, and the DirectX 9.0c API limit excludes any modern game that requires DirectX 10 or later.

For users who prioritize low power consumption, the 48 W TDP and single-slot form factor are strong advantages, allowing for quiet operation and compatibility with small-form-factor cases, provided the 254 mm length is accommodated. The 2x DVI outputs make it a practical choice for dual-monitor office setups or legacy system builds. However, the 256 MB memory capacity is a hard limitation: games that exceed this buffer will exhibit stuttering or texture pop-in, particularly at higher resolutions or with 4x anti-aliasing enabled. The card's fill-rate symmetry (6.000 GPixel/s and 6.000 GTexel/s) means that neither pixel throughput nor texturing is a bottleneck at standard settings, but the memory bandwidth will be the first constraint under load.

The card is not recommended for users seeking to play any game released after the DirectX 9.0c era, as it lacks the architectural features required for those titles. It is also not ideal for overclocking enthusiasts, as the 90 nm process and 48 W TDP limit headroom, and no boost clock is listed in the specifications. For a builder creating a period-accurate 2006 gaming rig or a retro LAN-party machine, the X1800 GTO offers a dependable, power-efficient option that sits comfortably in the middle of the performance spectrum. It is a bridge between the older Radeon R400 architecture and the newer R600, providing a taste of the Ultra-Threaded SE design without the power draw or cost of a flagship. The 200 W suggested PSU also means it can pair with older power supplies, reducing the total cost of a retro build, though the requirement for a 6-pin connector must be verified.