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Geforce GTX 680 vs Radeon HD 4850 1GB

Intro

The Geforce GTX 680 uses a 28 nm design. nVidia has clocked the core speed at 1006 MHz. The GDDR5 RAM runs at a speed of 1502 MHz on this specific model. It features 1536 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Compare all of that to the Radeon HD 4850 1GB, which has clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

(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 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 much (about 415%) better 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

The Geforce GTX 680 is quite a bit (approximately 222%) more effective at full screen anti-aliasing than the Radeon HD 4850 1GB, and capable of handling higher resolutions without losing too much performance. (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

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

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 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 11.0 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 largest amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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