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


The Radeon HD 4870 1GB comes with clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6670 (OEM), which comes with core clock speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 480 SPUs along with 24 TAUs and 8 ROPs.

Display Graphs

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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

Theoretically speaking, the Radeon HD 4870 1GB will be 80% quicker than the Radeon HD 6670 (OEM) in general, because of its higher 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 (about 56%) better at 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

The Radeon HD 4870 1GB is quite a bit (about 88%) better at FSAA than the Radeon HD 6670 (OEM), and will be capable of handling higher screen resolutions better. (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 largest amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.


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