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GeForce GTX 480 vs Radeon HD 6850


Intro

The GeForce GTX 480 uses a 40 nm design. nVidia has set the core speed at 700 MHz. The GDDR5 memory works at a speed of 924 MHz on this specific model. It features 480 SPUs as well as 60 Texture Address Units and 48 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6850, which features core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GTX 480 3650 points
Radeon HD 6850 2395 points
Difference: 1255 (52%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
GeForce GTX 480 250 Watts
Difference: 123 Watts (97%)

Memory Bandwidth

Theoretically, the GeForce GTX 480 should be quite a bit faster than the Radeon HD 6850 overall. (explain)

GeForce GTX 480 177408 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 49408 (39%)

Texel Rate

The GeForce GTX 480 should be a small bit (approximately 13%) better at anisotropic filtering than the Radeon HD 6850. (explain)

GeForce GTX 480 42000 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 4800 (13%)

Pixel Rate

The GeForce GTX 480 should be much (approximately 35%) more effective at AA than the Radeon HD 6850, and also will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 480 33600 Mpixels/sec
Radeon HD 6850 24800 Mpixels/sec
Difference: 8800 (35%)

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 480

Radeon HD 6850

Specifications

Display Specifications

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Model GeForce GTX 480 Radeon HD 6850
Manufacturer nVidia AMD
Year March 2010 October 2010
Code Name GF100 Barts Pro
Memory 1536 MB 1024 MB
Core Speed 700 MHz 775 MHz
Memory Speed 3696 MHz 4000 MHz
Power (Max TDP) 250 watts 127 watts
Bandwidth 177408 MB/sec 128000 MB/sec
Texel Rate 42000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 33600 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 480 960
Texture Mapping Units 60 48
Render Output Units 48 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 3000 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

GeForce GTX 480

Radeon HD 6850

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