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Radeon HD 4770 vs Radeon HD 4830 512MB

Intro

The Radeon HD 4770 makes use of a 40 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory runs at a speed of 800 MHz on this particular model. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Compare all of that to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has clocked the core frequency at 575 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 4830 512MB 95 Watts
Difference: 15 Watts (19%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 512MB will be 13% faster than the Radeon HD 4770 overall, due to its greater data rate. (explain)

Radeon HD 4830 512MB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The Radeon HD 4770 is quite a bit (more or less 30%) faster with regards to texture filtering than the Radeon HD 4830 512MB. (explain)

Radeon HD 4770 24000 Mtexels/sec
Radeon HD 4830 512MB 18400 Mtexels/sec
Difference: 5600 (30%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4770 is a better choice, by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4830 512MB 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

Check prices at:

Radeon HD 4830 512MB

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 4830 512MB
Manufacturer AMD AMD
Year Apr 28, 2009 Oct 21, 2008
Code Name RV740 RV770 LE
Memory 512 MB 512 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 GDDR3
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: Bandwidth is the max amount of information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - 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 4830 512MB

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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