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Radeon HD 4770 vs Radeon HD 6750

Intro

The Radeon HD 4770 comes with a clock speed of 750 MHz and a GDDR5 memory speed of 800 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6750, which comes with GPU core speed of 725 MHz, and 512 MB of GDDR5 RAM running at 1000 MHz through a 128-bit bus. It also features 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 6750 86 Watts
Difference: 6 Watts (8%)

Memory Bandwidth

The Radeon HD 6750 should theoretically perform a lot faster than the Radeon HD 4770 overall. (explain)

Radeon HD 6750 64000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 should be a small bit (more or less 9%) more effective at texture filtering than the Radeon HD 4770. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 2100 (9%)

Pixel Rate

The Radeon HD 4770 will be a little bit (about 3%) better at AA than the Radeon HD 6750, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 400 (3%)

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 6750

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 6750
Manufacturer AMD AMD
Year Apr 28, 2009 January 2011
Code Name RV740 Juniper Pro
Memory 512 MB 512 MB
Core Speed 750 MHz 725 MHz
Memory Speed 3200 MHz 4000 MHz
Power (Max TDP) 80 watts 86 watts
Bandwidth 51200 MB/sec 64000 MB/sec
Texel Rate 24000 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 640(128x5) 720
Texture Mapping Units 32 36
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 826 million 1040 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.0

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 6750

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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