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Radeon HD 4770 vs Radeon HD 6750

Intro

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

Compare those specifications to the Radeon HD 6750, which has clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 memory. It features 720 SPUs along with 36 TAUs and 16 Rasterization Operator 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

Performance-wise, the Radeon HD 6750 should in theory be a lot better 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 is just a bit (about 9%) faster with regards to 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

If using lots of anti-aliasing is important to you, then the Radeon HD 4770 is a better choice, but it probably won't make a huge difference. (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 information (in units of megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, 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 number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max 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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