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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 particular model. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 4850 1GB, which features GPU clock speed of 625 MHz, and 1024 MB of GDDR4 RAM set to run at 993 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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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 will be 203% quicker than the Radeon HD 4850 1GB overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Geforce GTX 680 should be a lot (approximately 415%) better at 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 a high resolution 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

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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
Memory 2048 MB 1024 MB
Core Speed 1006 MHz 625 MHz
Memory Speed 6008 MHz 1986 MHz
Power (Max TDP) 195 watts 110 watts
Bandwidth 192256 MB/sec 63552 MB/sec
Texel Rate 128768 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 10000 Mpixels/sec
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
Fab Process 28 nm 55 nm
Transistors 3540 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.2 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock 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 also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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