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GeForce GTX 550 Ti vs Radeon HD 4850 1GB

Intro

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

Compare all of that to the Radeon HD 4850 1GB, which uses a 55 nm design. AMD has set the core frequency at 625 MHz. The GDDR4 memory is set to run at a speed of 993 MHz on this particular card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

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

Performance-wise, the GeForce GTX 550 Ti should in theory be a lot better 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 is a bit (about 15%) more effective at texture 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

If running with high levels of AA is important to you, then the GeForce GTX 550 Ti is the winner, by a large margin. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be applied per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better 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 can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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