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Radeon HD 4770 vs Radeon HD 4850 2GB

Intro

The Radeon HD 4770 features a GPU core speed of 750 MHz, and the 512 MB of GDDR5 memory is set to run at 800 MHz through a 128-bit bus. It also features 640(128x5) Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4850 2GB, which features clock speeds of 625 MHz on the GPU, and 993 MHz on the 2048 MB of GDDR4 RAM. It features 800(160x5) SPUs as well as 40 Texture Address Units 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 4850 2GB 110 Watts
Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 2GB will be 24% quicker than the Radeon HD 4770 overall, because of its higher bandwidth. (explain)

Radeon HD 4850 2GB 63552 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12352 (24%)

Texel Rate

The Radeon HD 4850 2GB is a small bit (approximately 4%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

Radeon HD 4850 2GB 25000 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1000 (4%)

Pixel Rate

The Radeon HD 4770 will be a little bit (approximately 20%) better at anti-aliasing than the Radeon HD 4850 2GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 2000 (20%)

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 4850 2GB

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 4850 2GB
Manufacturer AMD AMD
Year Apr 28, 2009 Jun 25, 2008
Code Name RV740 RV770 PRO
Memory 512 MB 2048 MB
Core Speed 750 MHz 625 MHz
Memory Speed 3200 MHz 1986 MHz
Power (Max TDP) 80 watts 110 watts
Bandwidth 51200 MB/sec 63552 MB/sec
Texel Rate 24000 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better 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 most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 4850 2GB

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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