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Radeon HD 4870 1GB vs Radeon HD 6850

Intro

The Radeon HD 4870 1GB has core speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare all that to the Radeon HD 6850, which has core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs along with 48 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 23 Watts (18%)

Memory Bandwidth

The Radeon HD 6850, in theory, should perform a small bit faster than the Radeon HD 4870 1GB overall. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 12800 (11%)

Texel Rate

The Radeon HD 6850 should be quite a bit (more or less 24%) faster with regards to texture filtering than the Radeon HD 4870 1GB. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 7200 (24%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6850 is superior to the Radeon HD 4870 1GB, by a large margin. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 12800 (107%)

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 4870 1GB

Amazon.com

Radeon HD 6850

Amazon.com

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 4870 1GB Radeon HD 6850
Manufacturer AMD AMD
Year Jun 25, 2008 October 2010
Code Name RV770 XT Barts Pro
Memory 1024 MB 1024 MB
Core Speed 750 MHz 775 MHz
Memory Speed 3600 MHz 4000 MHz
Power (Max TDP) 150 watts 127 watts
Bandwidth 115200 MB/sec 128000 MB/sec
Texel Rate 30000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1700 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: Bandwidth is the max amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4870 1GB

Amazon.com

Radeon HD 6850

Amazon.com

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.

Comments

One Response to “Radeon HD 4870 1GB vs Radeon HD 6850”
Möglichst preisgünstige, gleichwertige Ersatzkarte zur HD4870? - Diablo 3 Forum | inDiablo.de by ingame™ says:

[...] zu einer Karte aus dem Performancesegment wie die HD6850/6870 sieht es schon ganz anders aus (siehe hier). Preis liegt bei ca. 130 Euro für eine 6850. Die Leistungsaufnahme dieser Karten ist ebenfalls [...]

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