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GeForce GTX 260 vs Radeon HD 4890 1GB


Intro

The GeForce GTX 260 makes use of a 65 nm design. nVidia has clocked the core speed at 576 MHz. The GDDR3 memory runs at a speed of 999 MHz on this specific card. It features 192 SPUs as well as 64 TAUs and 28 Rasterization Operator Units.

Compare those specs to the Radeon HD 4890 1GB, which comes with GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation 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 is 12% faster than the GeForce GTX 260 overall, because of its greater data rate. (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 (approximately 9%) more effective at texture filtering 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 a better choice, but not by far. (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 maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

GeForce GTX 260

Radeon HD 4890 1GB

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