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Radeon HD 4770 vs Radeon HD 6750 1GB

Intro

The Radeon HD 4770 makes use of a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory runs at a frequency of 800 MHz on this particular model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6750 1GB, which comes with a clock frequency of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 720 SPUs, 36 Texture Address Units, 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 1GB 86 Watts
Difference: 6 Watts (8%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB should be much faster than the Radeon HD 4770 in general. (explain)

Radeon HD 6750 1GB 64000 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 1GB is a bit (more or less 9%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 2100 (9%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4770 is the winner, but not by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 6750 1GB 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 1GB

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 1GB
Manufacturer AMD AMD
Year Apr 28, 2009 January 2011
Code Name RV740 Juniper Pro
Memory 512 MB 1024 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 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 6750 1GB

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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