The X1500 series of Radeon video cards includes three separate models from the X1550 line. These cards are designed to support the PCI, AGP and PCI Express video interfaces. These cards provide similar performance levels but are available in different memory configurations. The X1550 line of video cards is an outdated budget line introduced in 2007. These cards are designed to provide basic performance capabilities suitable for word processing, Web browsing and other graphically non-intensive applications.
The X1550 series uses the RV516 graphics processing unit. This processor has a stock core clock speed of 550 megahertz. Texture processing is assisted by four fragment pipelines, two vertex pipelines, four texture units and four raster operators. The X1550s have a pixel fill rate of 2,200 megapixels per second and a texture fill rate of 2200 MTexels per second. These cards perform shader operations at 2,200 MOperations per second and are capable of processing 275 MVertices per second.
X1550 video cards use DDR, DDR2 or GDDR3 memory modules with a 128-bit memory bus consisting of four 32-bit data channels. This memory has a stock memory clock rated at 400MHz with an effective speed of 800MHz. It provides 12.8 gigabytes per second of memory bandwidth and is available in several configurations. The PCI Express version of this card is available in 128, 256 and 512 MB versions while the PCI version only supports a 256 MB configuration. The AGP 8x version of this card supports the broadest variety of memory configurations including 128, 256, 260 and 512 megabytes.
The Radeon X1550 supports several outdated application programming interfaces including DirectX9.0, Shader Model 3.0 and OpenGL 2.0. These cards support a variety of rendering features including 64-bit floating point high dynamic range rendering.The X1550 uses 2, 4 and 6x temporal and adaptive anti-aliasing modes to provide enhanced texture smoothing. The clarity of textures is enhanced using anisotropic filtering modes including 2, 4, 8 and 16 pass filters. These cards also support high resolution textures up to 4,000 by 4,000 pixels. Multi-GPU crossfire support is also available for these cards using alternate frame rendering, scissor, super anti-aliasing and supertiling for multi-GPU display modes.
Digital output on the X1550 is supported by dual- and single-link DVI video output ports that are compatible with HDMI and HDCP video output. These cards support analogue TV output using a Xilleon TV encoder. Analogue VGA output is provided from dual integrated DACs operating at 400MHz which also support dual independent display output. HDTV output is also supported using YPrPb cables and the appropriate adaptors.