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GeForce GTX 550 Ti vs Radeon HD 4850 1GB

Intro

The GeForce GTX 550 Ti has a GPU clock speed of 900 MHz, and the 1024 MB of GDDR5 memory is set to run at 1026 MHz through a 192-bit bus. It also is comprised of 192 Stream Processors, 32 TAUs, and 24 ROPs.

Compare those specifications to the Radeon HD 4850 1GB, which features GPU core speed of 625 MHz, and 1024 MB of GDDR4 RAM set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 1GB 110 Watts
GeForce GTX 550 Ti 116 Watts
Difference: 6 Watts (5%)

Memory Bandwidth

In theory, the GeForce GTX 550 Ti should be much faster than the Radeon HD 4850 1GB overall. (explain)

GeForce GTX 550 Ti 98496 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 34944 (55%)

Texel Rate

The GeForce GTX 550 Ti should be a little bit (more or less 15%) better at anisotropic filtering than the Radeon HD 4850 1GB. (explain)

GeForce GTX 550 Ti 28800 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 3800 (15%)

Pixel Rate

The GeForce GTX 550 Ti will be much (approximately 116%) more effective at anti-aliasing than the Radeon HD 4850 1GB, and will be able to handle higher screen resolutions better. (explain)

GeForce GTX 550 Ti 21600 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 11600 (116%)

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

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GeForce GTX 550 Ti

Amazon.com

Radeon HD 4850 1GB

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

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Model GeForce GTX 550 Ti Radeon HD 4850 1GB
Manufacturer nVidia AMD
Year March 2011 Jun 25, 2008
Code Name GF116 RV770 PRO
Memory 1024 MB 1024 MB
Core Speed 900 MHz 625 MHz
Memory Speed 4104 MHz 1986 MHz
Power (Max TDP) 116 watts 110 watts
Bandwidth 98496 MB/sec 63552 MB/sec
Texel Rate 28800 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 21600 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 192 800(160x5)
Texture Mapping Units 32 40
Render Output Units 24 16
Bus Type GDDR5 GDDR4
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 max amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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