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Radeon HD 4850 1GB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4850 1GB features clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare those specifications to the Radeon HD 6770 1GB, which comes with core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should be 6% faster than the Radeon HD 4850 1GB in general, because of its higher data rate. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 3648 (6%)

Texel Rate

The Radeon HD 6770 1GB should be much (about 44%) better at anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 11000 (44%)

Pixel Rate

The Radeon HD 6770 1GB is quite a bit (more or less 44%) more effective at AA than the Radeon HD 4850 1GB, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 4400 (44%)

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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Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon HD 6770 1GB

Amazon.com

Check prices at:

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 Radeon HD 4850 1GB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Jun 25, 2008 January 2011
Code Name RV770 PRO Juniper XT
Memory 1024 MB 1024 MB
Core Speed 625 MHz 900 MHz
Memory Speed 1986 MHz 4200 MHz
Power (Max TDP) 110 watts 108 watts
Bandwidth 63552 MB/sec 67200 MB/sec
Texel Rate 25000 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 800(160x5) 800
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon HD 6770 1GB

Amazon.com

Check prices at:

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.

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