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Radeon HD 4850 X2 1GB vs Radeon HD 6770 1GB

Intro

The Radeon HD 4850 X2 1GB has core speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6770 1GB, which comes with clock 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 X2 1GB 250 Watts
Difference: 142 Watts (131%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB should perform quite a bit faster than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 59904 (89%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (more or less 39%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Radeon HD 6770 1GB 36000 Mtexels/sec
Difference: 14000 (39%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4850 X2 1GB is a better choice, by a large margin. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Radeon HD 6770 1GB 14400 Mpixels/sec
Difference: 5600 (39%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4850 X2 1GB

Amazon.com

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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 X2 1GB Radeon HD 6770 1GB
Manufacturer AMD AMD
Year Nov 7, 2008 January 2011
Code Name R700 Juniper XT
Memory 1024 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 900 MHz
Memory Speed 1986 MHz (x2) 4200 MHz
Power (Max TDP) 250 watts 108 watts
Bandwidth 127104 MB/sec 67200 MB/sec
Texel Rate 50000 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed 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 the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 4850 X2 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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