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GeForce GTX 550 Ti vs Radeon HD 4870 512MB


Intro

The GeForce GTX 550 Ti comes with a GPU clock speed of 900 MHz, and the 1024 MB of GDDR5 memory runs at 1026 MHz through a 192-bit bus. It also features 192 Stream Processors, 32 Texture Address Units, and 24 ROPs.

Compare those specs to the Radeon HD 4870 512MB, which features GPU clock speed of 750 MHz, and 512 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also features 800(160x5) Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 550 Ti 116 Watts
Radeon HD 4870 512MB 150 Watts
Difference: 34 Watts (29%)

Memory Bandwidth

In theory, the Radeon HD 4870 512MB is 17% quicker than the GeForce GTX 550 Ti overall, because of its higher data rate. (explain)

Radeon HD 4870 512MB 115200 MB/sec
GeForce GTX 550 Ti 98496 MB/sec
Difference: 16704 (17%)

Texel Rate

The Radeon HD 4870 512MB is just a bit (approximately 4%) more effective at anisotropic filtering than the GeForce GTX 550 Ti. (explain)

Radeon HD 4870 512MB 30000 Mtexels/sec
GeForce GTX 550 Ti 28800 Mtexels/sec
Difference: 1200 (4%)

Pixel Rate

The GeForce GTX 550 Ti is much (about 80%) faster with regards to anti-aliasing than the Radeon HD 4870 512MB, and capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 550 Ti 21600 Mpixels/sec
Radeon HD 4870 512MB 12000 Mpixels/sec
Difference: 9600 (80%)

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

Radeon HD 4870 512MB

Specifications

Display Specifications

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Model GeForce GTX 550 Ti Radeon HD 4870 512MB
Manufacturer nVidia AMD
Year March 2011 Jun 25, 2008
Code Name GF116 RV770 XT
Memory 1024 MB 512 MB
Core Speed 900 MHz 750 MHz
Memory Speed 4104 MHz 3600 MHz
Power (Max TDP) 116 watts 150 watts
Bandwidth 98496 MB/sec 115200 MB/sec
Texel Rate 28800 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 192 800(160x5)
Texture Mapping Units 32 40
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1170 million 956 million
Bus PCIe 2.1 x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

GeForce GTX 550 Ti

Radeon HD 4870 512MB

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