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Radeon HD 4850 X2 512MB vs Radeon HD 6870

Intro

The Radeon HD 4850 X2 512MB has core clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this card. It features 1120 SPUs along with 56 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 99 Watts (66%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6870 should in theory be a small bit superior to the Radeon HD 4850 X2 512MB in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 7296 (6%)

Texel Rate

The Radeon HD 6870 is a little bit (more or less 1%) better at anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 400 (1%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6870 is a better choice, and very much so. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 8800 (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.

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 6870

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 6870
Manufacturer AMD AMD
Year Nov 7, 2008 October 2010
Code Name R700 Barts XT
Memory 512 MB (x2) 1024 MB
Core Speed 625 MHz (x2) 900 MHz
Memory Speed 1986 MHz (x2) 4200 MHz
Power (Max TDP) 250 watts 151 watts
Bandwidth 127104 MB/sec 134400 MB/sec
Texel Rate 50000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) (x2) 1120
Texture Mapping Units 40 (x2) 56
Render Output Units 16 (x2) 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially 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

Hide Prices

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6870

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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