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Radeon HD 4850 X2 512MB vs Radeon HD 6770

Intro

The Radeon HD 4850 X2 512MB has a clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 6770, which comes with clock speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 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 X2 512MB 250 Watts
Difference: 142 Watts (131%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 512MB should theoretically be a lot superior to the Radeon HD 6770 overall. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 59904 (89%)

Texel Rate

The Radeon HD 4850 X2 512MB should be a lot (approximately 39%) faster with regards to AF than the Radeon HD 6770. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 14000 (39%)

Pixel Rate

The Radeon HD 4850 X2 512MB is much (approximately 39%) more effective at FSAA than the Radeon HD 6770, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 6770 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 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 X2 512MB Radeon HD 6770
Manufacturer AMD AMD
Year Nov 7, 2008 January 2011
Code Name R700 Juniper XT
Memory 512 MB (x2) 512 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 (measured in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics 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 Raster Operations Pipelines 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 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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