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GeForce GTX 550 Ti vs Radeon HD 4870 2GB

Intro

The GeForce GTX 550 Ti has clock speeds of 900 MHz on the GPU, and 1026 MHz on the 1024 MB of GDDR5 memory. It features 192 SPUs along with 32 TAUs and 24 Rasterization Operator Units.

Compare those specifications to the Radeon HD 4870 2GB, which features core speeds of 750 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator 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 4870 2GB 150 Watts
Difference: 34 Watts (29%)

Memory Bandwidth

Theoretically, the Radeon HD 4870 2GB should be just a bit faster than the GeForce GTX 550 Ti overall. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce GTX 550 Ti 98496 MB/sec
Difference: 16704 (17%)

Texel Rate

The Radeon HD 4870 2GB should be a bit (approximately 4%) better at AF than the GeForce GTX 550 Ti. (explain)

Radeon HD 4870 2GB 30000 Mtexels/sec
GeForce GTX 550 Ti 28800 Mtexels/sec
Difference: 1200 (4%)

Pixel Rate

The GeForce GTX 550 Ti is much (about 80%) more effective at full screen anti-aliasing than the Radeon HD 4870 2GB, and will be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 550 Ti 21600 Mpixels/sec
Radeon HD 4870 2GB 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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 550 Ti

Amazon.com

Other US-based stores

Radeon HD 4870 2GB

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 550 Ti Radeon HD 4870 2GB
Manufacturer nVidia ATi
Year March 2011 Jun 25, 2008
Code Name GF116 RV770 XT
Fab Process 40 nm 55 nm
Bus PCIe 2.1 x16 PCIe 2.0 x16
Memory 1024 MB 2048 MB
Core Speed 900 MHz 750 MHz
Shader Speed 1800 MHz (N/A) MHz
Memory Speed 1026 MHz (4104 MHz effective) 900 MHz (3600 MHz effective)
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
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0
Power (Max TDP) 116 watts 150 watts
Shader Model 5.0 4.1
Bandwidth 98496 MB/sec 115200 MB/sec
Texel Rate 28800 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 12000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of 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.

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