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Geforce GTX 680 vs Radeon HD 4850 1GB

Intro

The Geforce GTX 680 uses a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 RAM works at a frequency of 1502 MHz on this specific card. It features 1536 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 4850 1GB, which features core clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 1GB 110 Watts
Geforce GTX 680 195 Watts
Difference: 85 Watts (77%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 is 203% faster than the Radeon HD 4850 1GB in general, due to its greater data rate. (explain)

Geforce GTX 680 192256 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 128704 (203%)

Texel Rate

The Geforce GTX 680 is a lot (about 415%) faster with regards to anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 103768 (415%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 680 is a better choice, by far. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 22192 (222%)

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

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Geforce GTX 680

Amazon.com

Radeon HD 4850 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

Display Specifications

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Model Geforce GTX 680 Radeon HD 4850 1GB
Manufacturer nVidia AMD
Year March 2012 Jun 25, 2008
Code Name GK104 RV770 PRO
Fab Process 28 nm 55 nm
Bus PCIe 3.0 x16 PCIe 2.0 x16
Memory 2048 MB 1024 MB
Core Speed 1006 MHz 625 MHz
Shader Speed 1006 MHz (N/A) MHz
Memory Speed 6008 MHz 1986 MHz
Unified Shaders 1536 800(160x5)
Texture Mapping Units 128 40
Render Output Units 32 16
Bus Type GDDR5 GDDR4
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0
Power (Max TDP) 195 watts 110 watts
Shader Model 5.0 4.1
Bandwidth 192256 MB/sec 63552 MB/sec
Texel Rate 128768 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 10000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few 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.

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