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Geforce GTX 680 vs Radeon HD 4870 X2

Intro

The Geforce GTX 680 comes with a core clock speed of 1006 MHz and a GDDR5 memory speed of 1502 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is made up of 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 4870 X2, which comes with a GPU core 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 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680 195 Watts
Radeon HD 4870 X2 350 Watts
Difference: 155 Watts (79%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 is 20% faster than the Geforce GTX 680 overall, due to its higher bandwidth. (explain)

Radeon HD 4870 X2 230400 MB/sec
Geforce GTX 680 192256 MB/sec
Difference: 38144 (20%)

Texel Rate

The Geforce GTX 680 is much (more or less 115%) more effective at anisotropic filtering than the Radeon HD 4870 X2. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 4870 X2 60000 Mtexels/sec
Difference: 68768 (115%)

Pixel Rate

The Geforce GTX 680 will be quite a bit (about 34%) faster with regards to anti-aliasing than the Radeon HD 4870 X2, and should be capable of handling higher resolutions better. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 4870 X2 24000 Mpixels/sec
Difference: 8192 (34%)

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 680

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 680 Radeon HD 4870 X2
Manufacturer nVidia AMD
Year March 2012 Aug 12, 2008
Code Name GK104 R700
Memory 2048 MB 1024 MB (x2)
Core Speed 1006 MHz 750 MHz (x2)
Memory Speed 6008 MHz 3600 MHz (x2)
Power (Max TDP) 195 watts 350 watts
Bandwidth 192256 MB/sec 230400 MB/sec
Texel Rate 128768 Mtexels/sec 60000 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 24000 Mpixels/sec
Unified Shaders 1536 800(160x5) (x2)
Texture Mapping Units 128 40 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 3540 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Geforce GTX 680

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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