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GeForce GTX 550 Ti vs Radeon HD 6870

Intro

The GeForce GTX 550 Ti comes with core speeds of 900 MHz on the GPU, and 1026 MHz on the 1024 MB of GDDR5 memory. It features 192 SPUs as well as 32 Texture Address Units and 24 ROPs.

Compare all of that to the Radeon HD 6870, which has a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 ROPs.

(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 quite a bit superior to the GeForce GTX 550 Ti in general. (explain)

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

Texel Rate

The Radeon HD 6870 should be much (about 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 much (about 33%) faster with regards to anti-aliasing than the GeForce GTX 550 Ti, and capable of handling higher resolutions while still performing well. (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 largest amount of data (measured in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units 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 applied in a second.

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

Comments

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