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Radeon HD 4770 vs Radeon HD 4830 1GB

Intro

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

Compare all of that to the Radeon HD 4830 1GB, which features a clock frequency of 575 MHz and a GDDR4 memory speed of 900 MHz. It also uses a 256-bit memory bus, and makes use of a 55 nm design. It features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 4830 1GB 95 Watts
Difference: 15 Watts (19%)

Memory Bandwidth

The Radeon HD 4830 1GB should theoretically perform a little bit faster than the Radeon HD 4770 overall. (explain)

Radeon HD 4830 1GB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 will be much (more or less 30%) better at AF than the Radeon HD 4830 1GB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 4830 1GB 18400 Mtexels/sec
Difference: 5600 (30%)

Pixel Rate

The Radeon HD 4770 will be much (more or less 30%) better at full screen anti-aliasing than the Radeon HD 4830 1GB, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4830 1GB 9200 Mpixels/sec
Difference: 2800 (30%)

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

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Radeon HD 4830 1GB

Amazon.com

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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 4830 1GB
Manufacturer AMD AMD
Year Apr 28, 2009 Oct 21, 2008
Code Name RV740 RV770 LE
Memory 512 MB 1024 MB
Core Speed 750 MHz 575 MHz
Memory Speed 3200 MHz 1800 MHz
Power (Max TDP) 80 watts 95 watts
Bandwidth 51200 MB/sec 57600 MB/sec
Texel Rate 24000 Mtexels/sec 18400 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 9200 Mpixels/sec
Unified Shaders 640(128x5) 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 826 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - 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 4830 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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