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Radeon HD 4870 1GB vs Radeon HD 6870

Intro

The Radeon HD 4870 1GB features a GPU core speed of 750 MHz, and the 1024 MB of GDDR5 RAM runs at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6870, which comes with GPU clock speed of 900 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also is made up of 1120 SPUs, 56 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 1GB 150 Watts
Radeon HD 6870 151 Watts
Difference: 1 Watts (1%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 will be 17% faster than the Radeon HD 4870 1GB in general, due to its greater bandwidth. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 19200 (17%)

Texel Rate

The Radeon HD 6870 should be a lot (more or less 68%) more effective at anisotropic filtering than the Radeon HD 4870 1GB. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 20400 (68%)

Pixel Rate

The Radeon HD 6870 is quite a bit (approximately 140%) more effective at anti-aliasing than the Radeon HD 4870 1GB, and also capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 16800 (140%)

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 6870

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 6870
Manufacturer AMD AMD
Year Jun 25, 2008 October 2010
Code Name RV770 XT Barts XT
Memory 1024 MB 1024 MB
Core Speed 750 MHz 900 MHz
Memory Speed 3600 MHz 4200 MHz
Power (Max TDP) 150 watts 151 watts
Bandwidth 115200 MB/sec 134400 MB/sec
Texel Rate 30000 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 800(160x5) 1120
Texture Mapping Units 40 56
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 (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be processed in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4870 1GB

Amazon.com

Radeon HD 6870

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 6870”
Verkaufe Einiges an Hardware... - TweakPC Hardware Forum says:

[...] Einiges an Hardware... nachfolger sind in der regel immer besser Radeon HD 4870 1GB vs Radeon HD 6870 – Performance Comparison Benchmarks @ Hardware Compare dadazu kommt noch das die 6870 nicht nur schneller sondern auch mehr futures hat DirectX11 usw. [...]

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