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GeForce GTX 260 vs Radeon HD 4890 1GB


Intro

The GeForce GTX 260 uses a 65 nm design. nVidia has set the core speed at 576 MHz. The GDDR3 memory is set to run at a speed of 999 MHz on this particular model. It features 192 SPUs along with 64 TAUs and 28 ROPs.

Compare all that to the Radeon HD 4890 1GB, which comes with core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 260 182 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 8 Watts (4%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB should be 12% faster than the GeForce GTX 260 overall, because of its greater bandwidth. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce GTX 260 111888 MB/sec
Difference: 12912 (12%)

Texel Rate

The Radeon HD 4890 1GB will be a little bit (more or less 9%) better at AF than the GeForce GTX 260. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce GTX 260 36864 Mtexels/sec
Difference: 3136 (9%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 260 is superior to the Radeon HD 4890 1GB, not by a very large margin though. (explain)

GeForce GTX 260 16128 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 128 (1%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce GTX 260

Radeon HD 4890 1GB

Specifications

Display Specifications

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Model GeForce GTX 260 Radeon HD 4890 1GB
Manufacturer nVidia AMD
Year June 16, 2008 Apr 2, 2009
Code Name G200 RV790 XT
Memory 896 MB 1024 MB
Core Speed 576 MHz 1000 MHz
Memory Speed 1998 MHz 3900 MHz
Power (Max TDP) 182 watts 190 watts
Bandwidth 111888 MB/sec 124800 MB/sec
Texel Rate 36864 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 16128 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 192 800(160x5)
Texture Mapping Units 64 40
Render Output Units 28 16
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit
Fab Process 65 nm 55 nm
Transistors 1400 million 959 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

GeForce GTX 260

Radeon HD 4890 1GB

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