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Radeon HD 4850 2GB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4850 2GB has a GPU core clock speed of 625 MHz, and the 2048 MB of GDDR4 memory is set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 TAUs, and 16 ROPs.

Compare all that to the Radeon HD 6770 1GB, which has a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 6770 1GB should be a bit faster than the Radeon HD 4850 2GB overall. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 3648 (6%)

Texel Rate

The Radeon HD 6770 1GB will be quite a bit (about 44%) faster with regards to texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 11000 (44%)

Pixel Rate

The Radeon HD 6770 1GB will be much (approximately 44%) better at full screen anti-aliasing than the Radeon HD 4850 2GB, and able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 4850 2GB 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 2GB

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 2GB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Jun 25, 2008 January 2011
Code Name RV770 PRO Juniper XT
Memory 2048 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 (counted in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels 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 number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably 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 2GB

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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