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Radeon HD 4870 1GB vs Radeon HD 6670 (OEM)


The Radeon HD 4870 1GB features a core clock speed of 750 MHz and a GDDR5 memory speed of 900 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6670 (OEM), which comes with a clock frequency of 800 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 24 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 87 Watts (138%)

Memory Bandwidth

In theory, the Radeon HD 4870 1GB is 80% quicker than the Radeon HD 6670 (OEM) in general, due to its greater bandwidth. (explain)

Radeon HD 4870 1GB 115200 MB/sec
Radeon HD 6670 (OEM) 64000 MB/sec
Difference: 51200 (80%)

Texel Rate

The Radeon HD 4870 1GB is much (approximately 56%) faster with regards to AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
Radeon HD 6670 (OEM) 19200 Mtexels/sec
Difference: 10800 (56%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4870 1GB is superior to the Radeon HD 6670 (OEM), by far. (explain)

Radeon HD 4870 1GB 12000 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 5600 (88%)

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

Radeon HD 6670 (OEM)

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.


Display Specifications

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Model Radeon HD 4870 1GB Radeon HD 6670 (OEM)
Manufacturer AMD AMD
Year Jun 25, 2008 February 2011
Code Name RV770 XT Turks
Memory 1024 MB 512 MB
Core Speed 750 MHz 800 MHz
Memory Speed 3600 MHz 4000 MHz
Power (Max TDP) 150 watts 63 watts
Bandwidth 115200 MB/sec 64000 MB/sec
Texel Rate 30000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 800(160x5) 480
Texture Mapping Units 40 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 715 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that 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 number of colour ROPs by the the core speed of the card. 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.


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