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Radeon HD 4770 vs Radeon HD 6670 (OEM)

Intro

The Radeon HD 4770 comes with core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6670 (OEM), which comes with clock speeds of 800 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 480 SPUs as well as 24 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 4770 80 Watts
Difference: 17 Watts (27%)

Memory Bandwidth

The Radeon HD 6670 (OEM) should theoretically perform a lot faster than the Radeon HD 4770 overall. (explain)

Radeon HD 6670 (OEM) 64000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12800 (25%)

Texel Rate

The Radeon HD 4770 will be a lot (about 25%) more effective at AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 6670 (OEM) 19200 Mtexels/sec
Difference: 4800 (25%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4770 is a better choice, and very much so. (explain)

Radeon HD 4770 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 4770

Amazon.com

Check prices at:

Radeon HD 6670 (OEM)

Amazon.com

Check prices at:

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 4770 Radeon HD 6670 (OEM)
Manufacturer AMD AMD
Year Apr 28, 2009 February 2011
Code Name RV740 Turks
Memory 512 MB 512 MB
Core Speed 750 MHz 800 MHz
Memory Speed 3200 MHz 4000 MHz
Power (Max TDP) 80 watts 63 watts
Bandwidth 51200 MB/sec 64000 MB/sec
Texel Rate 24000 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 6400 Mpixels/sec
Unified Shaders 640(128x5) 480
Texture Mapping Units 32 24
Render Output Units 16 8
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 826 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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should 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 anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 6670 (OEM)

Amazon.com

Check prices at:

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.

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