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

Intro

The Radeon HD 4870 1GB has a GPU core speed of 750 MHz, and the 1024 MB of GDDR5 memory is set to run at 900 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 6670 (OEM), which features a core clock speed 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 Texture Address Units, and 8 Raster Operation Units.

(No game benchmarks for this combination yet.)

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 will be 80% faster than the Radeon HD 6670 (OEM) overall, because of its higher data rate. (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 will be a lot (about 56%) more effective 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 should be much (approximately 88%) better at AA than the Radeon HD 6670 (OEM), and also will be capable of handling higher resolutions without losing too much performance. (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

Radeon HD 4870 1GB

Amazon.com

Radeon HD 6670 (OEM)

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

Model Radeon HD 4870 1GB Radeon HD 6670 (OEM)
Manufacturer AMD AMD
Year Jun 25, 2008 February 2011
Code Name RV770 XT Turks
Fab Process 55 nm 40 nm
Bus PCIe 2.0 x16 PCIe 2.1 x16
Memory 1024 MB 512 MB
Core Speed 750 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 900 MHz (3600 MHz effective) 1000 MHz (4000 MHz effective)
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
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1
Power (Max TDP) 150 watts 63 watts
Shader Model 4.1 5.0
Bandwidth 115200 MB/sec 64000 MB/sec
Texel Rate 30000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 6400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure 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 graphics 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 amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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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