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Radeon HD 4850 512MB vs Radeon HD 6770

Intro

The Radeon HD 4850 512MB comes with a GPU core clock speed of 625 MHz, and the 512 MB of GDDR3 RAM is set to run at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6770, which has GPU core speed of 900 MHz, and 512 MB of GDDR5 RAM running at 1050 MHz through a 128-bit bus. It also is comprised of 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

The Radeon HD 6770, in theory, should perform a bit faster than the Radeon HD 4850 512MB overall. (explain)

Radeon HD 6770 67200 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 3648 (6%)

Texel Rate

The Radeon HD 6770 is quite a bit (approximately 44%) better at anisotropic filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 6770 36000 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 11000 (44%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6770 is superior to the Radeon HD 4850 512MB, and very much so. (explain)

Radeon HD 6770 14400 Mpixels/sec
Radeon HD 4850 512MB 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 512MB

Amazon.com

Check prices at:

Radeon HD 6770

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 512MB Radeon HD 6770
Manufacturer AMD AMD
Year Jun 25, 2008 January 2011
Code Name RV770 PRO Juniper XT
Memory 512 MB 512 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 GDDR3 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 largest amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses 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 can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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Radeon HD 4850 512MB

Amazon.com

Check prices at:

Radeon HD 6770

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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