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GeForce GTX 260 vs Radeon HD 4870 X2

Intro

The GeForce GTX 260 has clock speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 memory. It features 192 SPUs as well as 64 TAUs and 28 Rasterization Operator Units.

Compare those specs to the Radeon HD 4870 X2, which has GPU clock speed of 750 MHz, and 1024 MB of GDDR5 memory set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 260 182 Watts
Radeon HD 4870 X2 350 Watts
Difference: 168 Watts (92%)

Memory Bandwidth

The Radeon HD 4870 X2 should in theory be a lot faster than the GeForce GTX 260 in general. (explain)

Radeon HD 4870 X2 230400 MB/sec
GeForce GTX 260 111888 MB/sec
Difference: 118512 (106%)

Texel Rate

The Radeon HD 4870 X2 should be much (approximately 63%) more effective at texture filtering than the GeForce GTX 260. (explain)

Radeon HD 4870 X2 60000 Mtexels/sec
GeForce GTX 260 36864 Mtexels/sec
Difference: 23136 (63%)

Pixel Rate

The Radeon HD 4870 X2 is a lot (more or less 49%) more effective at full screen anti-aliasing than the GeForce GTX 260, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 4870 X2 24000 Mpixels/sec
GeForce GTX 260 16128 Mpixels/sec
Difference: 7872 (49%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 260

Amazon.com

Check prices at:

Radeon HD 4870 X2

Amazon.com

Check prices at:

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 4870 X2
Manufacturer nVidia AMD
Year June 16, 2008 Aug 12, 2008
Code Name G200 R700
Memory 896 MB 1024 MB (x2)
Core Speed 576 MHz 750 MHz (x2)
Memory Speed 1998 MHz 3600 MHz (x2)
Power (Max TDP) 182 watts 350 watts
Bandwidth 111888 MB/sec 230400 MB/sec
Texel Rate 36864 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 16128 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 192 800(160x5) (x2)
Texture Mapping Units 64 40 (x2)
Render Output Units 28 16 (x2)
Bus Type GDDR3 GDDR5
Bus Width 448-bit 256-bit (x2)
Fab Process 65 nm 55 nm
Transistors 1400 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
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 MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce GTX 260

Amazon.com

Check prices at:

Radeon HD 4870 X2

Amazon.com

Check prices at:

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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