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GeForce GTX 260 vs Radeon HD 4890 1GB


Intro

The GeForce GTX 260 has clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 RAM. It features 192 SPUs along with 64 Texture Address Units and 28 ROPs.

Compare those specifications to the Radeon HD 4890 1GB, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 975 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

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

As far as performance goes, the Radeon HD 4890 1GB should theoretically be a small bit superior to the GeForce GTX 260 in general. (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 small bit (about 9%) faster with regards to 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

The GeForce GTX 260 is a small bit (approximately 1%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and also will be capable of handling higher screen resolutions more effectively. (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

Display Prices

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GeForce GTX 260

Amazon.com

Radeon HD 4890 1GB

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one 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. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 260

Amazon.com

Radeon HD 4890 1GB

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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