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GeForce GTX 550 Ti vs Radeon HD 6870

Intro

The GeForce GTX 550 Ti has a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 memory is set to run at 1026 MHz through a 192-bit bus. It also is made up of 192 Stream Processors, 32 Texture Address Units, and 24 Raster Operation Units.

Compare all that to the Radeon HD 6870, which comes with GPU clock speed of 900 MHz, and 1024 MB of GDDR5 RAM set to run at 1050 MHz through a 256-bit bus. It also features 1120 SPUs, 56 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 550 Ti 116 Watts
Radeon HD 6870 151 Watts
Difference: 35 Watts (30%)

Memory Bandwidth

In theory, the Radeon HD 6870 will be 36% faster than the GeForce GTX 550 Ti overall, due to its higher data rate. (explain)

Radeon HD 6870 134400 MB/sec
GeForce GTX 550 Ti 98496 MB/sec
Difference: 35904 (36%)

Texel Rate

The Radeon HD 6870 will be much (more or less 75%) more effective at texture filtering than the GeForce GTX 550 Ti. (explain)

Radeon HD 6870 50400 Mtexels/sec
GeForce GTX 550 Ti 28800 Mtexels/sec
Difference: 21600 (75%)

Pixel Rate

The Radeon HD 6870 will be quite a bit (about 33%) more effective at FSAA than the GeForce GTX 550 Ti, and also will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 550 Ti 21600 Mpixels/sec
Difference: 7200 (33%)

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 550 Ti

Amazon.com

Radeon HD 6870

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 550 Ti Radeon HD 6870
Manufacturer nVidia AMD
Year March 2011 October 2010
Code Name GF116 Barts XT
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 900 MHz 900 MHz
Shader Speed 1800 MHz (N/A) MHz
Memory Speed 1026 MHz (4104 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 192 1120
Texture Mapping Units 32 56
Render Output Units 24 32
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 116 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 98496 MB/sec 134400 MB/sec
Texel Rate 28800 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If 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 amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

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