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GeForce GTX 550 Ti vs Radeon HD 4870 512MB

Intro

The GeForce GTX 550 Ti has a clock frequency of 900 MHz and a GDDR5 memory frequency of 1026 MHz. It also makes use of a 192-bit memory bus, and makes use of a 40 nm design. It is comprised of 192 SPUs, 32 TAUs, and 24 ROPs.

Compare those specs to the Radeon HD 4870 512MB, which makes use of a 55 nm design. ATi has set the core speed at 750 MHz. The GDDR5 memory runs at a speed of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 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 512MB 150 Watts
Difference: 34 Watts (29%)

Memory Bandwidth

Theoretically, the Radeon HD 4870 512MB should perform just a bit faster than the GeForce GTX 550 Ti overall. (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 should be a bit (approximately 4%) more effective at AF 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

If using lots of anti-aliasing is important to you, then the GeForce GTX 550 Ti is superior to the Radeon HD 4870 512MB, by a large margin. (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

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 512MB

Amazon.com

Other US-based stores

Specifications

Model GeForce GTX 550 Ti Radeon HD 4870 512MB
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 512 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: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 are applied in one 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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