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GeForce GTX 550 Ti vs Radeon HD 6870

Intro

The GeForce GTX 550 Ti makes use of a 40 nm design. nVidia has set the core speed at 900 MHz. The GDDR5 memory works at a frequency of 1026 MHz on this particular model. It features 192 SPUs along with 32 Texture Address Units and 24 ROPs.

Compare all that to the Radeon HD 6870, which has a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 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

Performance-wise, the Radeon HD 6870 should theoretically be a lot better than the GeForce GTX 550 Ti overall. (explain)

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

Texel Rate

The Radeon HD 6870 is quite a bit (about 75%) more effective at AF 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 should be quite a bit (approximately 33%) faster with regards to anti-aliasing than the GeForce GTX 550 Ti, and will be able to handle higher resolutions without losing too much performance. (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: Bandwidth is the max amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Comments

4 Responses to “GeForce GTX 550 Ti vs Radeon HD 6870”
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