ATI Radeon X1900 GT

The ATI Radeon X1900 GT, manufactured by AMD under the R580 chip, belongs to the Radeon R500 PCIe generation and is built on TSMC’s 90 nm process. It packs 384 million transistors on a 352 mm² die, yielding a transistor density of 1.1M per square millimeter. Its production status is end-of-life, with a release date of 2006-04-30, succeeding the Radeon R400 PCIe and preceding the Radeon R600. The card operates with a memory clock of 600 MHz, translating to 1200 Mbps effective, and is paired with 256 MB of GDDR3 memory across a 256-bit bus, delivering a bandwidth of 38.40 GB/s. The GPU includes 12 texture mapping units and 12 raster output units, achieving a pixel rate of 6.900 GPixel/s and a texture rate of 6.900 GTexel/s. Its TDP is 75 W, it requires a single 6-pin power connector, and the suggested PSU is 250 W. The card fits a single-slot design, uses a PCIe 1.0 x16 interface, and offers display outputs of 2x DVI and 1x S-Video. In terms of API support, it lists DirectX 9.0c (9_3), OpenGL 2.1 (full) and OpenGL 3.0 (partial), with no Vulkan support. The benchmark percentile versus all GPUs is 50, and the average benchmark score is 0, with no nearest rivals provided.

Benchmark Performance

The benchmark data for the ATI Radeon X1900 GT presents a unique situation: the average benchmark score is 0, and the percentile versus all GPUs is exactly 50. This percentile places the card at the median of all GPUs in the database, meaning half of all tracked graphics cards perform better and half perform worse. However, the score of 0 suggests that no specific benchmark results were recorded or normalized for this entry, so the percentile is likely derived from the hardware specifications rather than actual run scores. The pixel rate of 6.900 GPixel/s and texture rate of 6.900 GTexel/s indicate a balanced design where both units operate at the same throughput, which is typical for a card of this era. With 12 ROPs and 12 TMUs, the X1900 GT can process 12 pixels and 12 texels per clock cycle, but the actual fill rates depend on the memory clock. The 38.40 GB/s bandwidth is the ceiling for data movement, and at a 256-bit bus width with GDDR3 running at 600 MHz, this bandwidth directly feeds both the pixel and texture pipelines. Since no nearest rivals are listed, the relative performance cannot be quantified with deltas, but the median percentile suggests the X1900 GT sits in the middle of the pack, neither a high-end enthusiast card nor a low-end budget solution. The lack of benchmark scores means the theoretical fill rates and memory bandwidth are the primary quantitative indicators of performance, which point to a card that can handle contemporary games at moderate settings but will struggle with high-resolution textures or heavy anti-aliasing due to the 256 MB VRAM limit.

Who Should Consider It

Given the 50th percentile ranking, the ATI Radeon X1900 GT is positioned for users who play games from its release era (2006) at 1024x768 or 1280x1024 resolutions. The 256 MB GDDR3 memory, while small by modern standards, was sufficient for the titles of that period, and the 38.40 GB/s bandwidth supports texture streaming without excessive stuttering at those resolutions. For 3D applications that rely on DirectX 9.0c, which is fully supported, the card can deliver playable frame rates, especially with settings turned down to medium or low. The pixel rate of 6.900 GPixel/s is adequate for fill-rate-bound scenes at lower resolutions, but enabling 4x or 8x anti-aliasing would quickly saturate the ROPs and reduce performance. Users who prioritize high-detail settings or run multiple monitors (the card has 2x DVI outputs) will find the 256 MB frame buffer a limiting factor, as textures and geometry buffers compete for the same space. The card's OpenGL 2.1 full support and OpenGL 3.0 partial support mean older OpenGL titles run correctly, but newer games requiring OpenGL 3.0 features may experience graphical glitches or missing effects. In short, this card suits a retro gaming setup or a secondary machine for legacy software, not a primary system for modern gaming. The 75 W TDP and single-slot design also make it an easy drop-in for older OEM systems with modest power supplies.

Power and Cooling

The ATI Radeon X1900 GT has a TDP of 75 W, which is modest for a desktop GPU of its generation. This power draw is low enough that a 250 W PSU is recommended, as stated in the fact pack, making the card compatible with many pre-built systems from the mid-2000s that lacked high-wattage power supplies. However, the card does require a single 6-pin power connector, so any system must have that available on the PSU or via an adapter. The 75 W TDP means a single-slot cooler is sufficient, and the card is designed as a single-slot solution, which is advantageous for space-constrained cases or systems with multiple expansion cards. The cooling solution is not specified in terms of noise or heatsink size, but the low TDP implies that a simple aluminum heatsink with a small fan can dissipate the heat effectively. For users considering this card in a modern system, the 75 W draw is negligible, but the PCIe 1.0 x16 interface may limit compatibility with newer motherboards that expect PCIe 3.0 or 4.0—though the slot is backward compatible electrically, the bandwidth bottleneck could reduce performance. The power connector requirement is a hard constraint: without a 6-pin cable, the card will not function, so system builders must verify their PSU provides this. Overall, the power and cooling requirements are easy to meet, which is a positive trait for a card that is now primarily used in legacy builds.

How It Compares

Since the nearestRivals field is empty, the X1900 GT cannot be directly compared to specific competitor models using delta percentages or relative scores. The only positional data is the percentile versus all GPUs, which is 50. This means the card sits exactly at the median of the entire GPU database, but without rival names or score deltas, any comparative analysis must rely on the hardware specifications. In the context of its generation (Radeon R500 PCIe), the X1900 GT is a mid-range variant of the R580 chip, which also spawned higher-end parts with more TMUs and ROPs. The 12 TMUs and 12 ROPs are half of what the flagship R580-based card would have, and the 256-bit memory bus is narrower than the 512-bit bus used on top-tier models. The 256 MB VRAM is also a quarter of the maximum capacity available in that generation. Against its predecessor, the Radeon R400 PCIe, the X1900 GT offers a newer architecture (Ultra-Threaded SE) and a 90 nm process, which should improve clock-for-clock efficiency, but no quantitative scores exist to confirm. The successor, Radeon R600, would introduce unified shaders and a different memory architecture, but again, no direct benchmark comparisons are available. The absence of rival data means the X1900 GT is best understood as a standalone entry with a median performance ranking, not a card that outperforms or underperforms specific competitors by known margins.

Memory Subsystem

The memory subsystem of the ATI Radeon X1900 GT consists of 256 MB of GDDR3 memory on a 256-bit bus, running at 600 MHz with an effective data rate of 1200 Mbps. This configuration yields a bandwidth of 38.40 GB/s, which is the maximum rate at which data can be read from or written to VRAM. For a card in the 50th percentile, this bandwidth is moderate, and it directly impacts performance at high resolutions. At 1600x1200 or higher, the 256 MB frame buffer becomes a severe bottleneck because the back buffer, depth buffer, and textures must all reside within that capacity. Modern games with large texture sets will exceed 256 MB quickly, causing the card to spill to system memory over the PCIe 1.0 x16 bus, which has far lower bandwidth. The 256-bit bus width is a positive trait, as it allows the card to transfer more data per clock cycle than a 128-bit bus, but the small capacity negates this advantage in memory-intensive scenarios. GDDR3 at 1200 Mbps effective is not fast by today’s standards, but it was competitive in 2006. The 38.40 GB/s bandwidth is sufficient for the pixel rate of 6.900 GPixel/s, as each pixel requires roughly 5.5 bytes of memory traffic (assuming 32-bit color and 24-bit depth), which is well within the available bandwidth. However, enabling anti-aliasing multiplies the memory traffic, and with only 256 MB, the card will run out of space before bandwidth becomes the limit. For high-resolution gaming, the memory subsystem is the primary weakness, and users should stick to 1280x1024 or lower to avoid excessive swapping.

FAQ

Q: What is the manufacturing process for the ATI Radeon X1900 GT?

A: The card is built on a 90 nm process at TSMC, with 384 million transistors on a 352 mm² die, giving a transistor density of 1.1M per square millimeter.

Q: Does the card support DirectX 10 or Vulkan?

A: No. The fact pack lists DirectX 9.0c (9_3) and OpenGL 2.1 (full) with OpenGL 3.0 (partial). Vulkan support is not listed, meaning the card lacks it.

Q: How much power does the card draw and what PSU is recommended?

A: The TDP is 75 W, and the suggested PSU is 250 W. The card requires a single 6-pin power connector.

Q: What is the memory bandwidth and how does it affect performance?

A: The memory bandwidth is 38.40 GB/s, derived from 256 MB of GDDR3 on a 256-bit bus running at 600 MHz (1200 Mbps effective). This is adequate for the pixel rate but limits high-resolution performance due to the small 256 MB capacity.

Q: What display outputs are available?

A: The card has 2x DVI and 1x S-Video outputs, allowing dual digital monitors plus an analog TV connection.

Q: What is the production status and release date?

A: The production status is end-of-life, and the release date is 2006-04-30. Its predecessor is the Radeon R400 PCIe, and its successor is the Radeon R600.

Ray Tracing and Feature Set

The ATI Radeon X1900 GT does not include any dedicated ray tracing cores or tensor cores, as these fields are null in the fact pack. This is expected for a GPU from 2006, as ray tracing acceleration did not become a standard feature until much later. The card’s feature set is defined by its architecture, Ultra-Threaded SE, which was AMD’s design for handling multiple threads efficiently in a fixed-function pipeline. The API support is DirectX 9.0c (9_3), which covers shader model 3.0, enabling features like dynamic branching and longer shader programs for games of that era. OpenGL 2.1 is fully supported, while OpenGL 3.0 is only partially supported, meaning some OpenGL 3.0 extensions may not work correctly. Without Vulkan support, the card cannot run modern Vulkan-based games or applications. The lack of tensor cores means no AI-accelerated features like DLSS, and the absence of RT cores means no hardware-accelerated ray tracing, so all lighting and shadow effects must rely on traditional rasterization. The 12 TMUs and 12 ROPs provide the fill rates for these rasterization tasks, and the pixel rate of 6.900 GPixel/s is the ceiling for pixel shading operations. The texture rate matches at 6.900 GTexel/s, indicating a balanced pipeline where texture fetch and pixel output are equally matched. For users interested in retro gaming, the card fully supports DirectX 9.0c games, which was the dominant API in its release window, but it has no path forward to modern graphics features. The partial OpenGL 3.0 support is a caveat for enthusiasts running emulators or older GL applications that try to use 3.0 functions, which may cause crashes or visual artifacts. Overall, the feature set is strictly legacy, with no modern acceleration capabilities, but it is complete for the software of its time.