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Geforce GTX 680 vs Radeon HD 4850 1GB

Intro

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

Compare those specs to the Radeon HD 4850 1GB, which comes with core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

(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

In theory, the Geforce GTX 680 is 203% faster 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 is a lot (approximately 415%) more effective at AF 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 using lots of anti-aliasing is important to you, then the Geforce GTX 680 is superior to the Radeon HD 4850 1GB, and very much so. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Geforce GTX 680

Amazon.com

Other US-based stores

Radeon HD 4850 1GB

Amazon.com

Other US-based stores

Specifications

Model Geforce GTX 680 Radeon HD 4850 1GB
Manufacturer nVidia ATi
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 1502 MHz (6008 MHz effective) 993 MHz (1986 MHz effective)
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 11.1 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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