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Radeon HD 4770 vs Radeon HD 4850 1GB

Intro

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

Compare all of that to the Radeon HD 4850 1GB, which features clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 RAM. It features 800(160x5) SPUs along with 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 1GB 110 Watts
Difference: 30 Watts (38%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 1GB should in theory be a lot superior to the Radeon HD 4770 overall. (explain)

Radeon HD 4850 1GB 63552 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12352 (24%)

Texel Rate

The Radeon HD 4850 1GB should be just a bit (about 4%) faster with regards to AF than the Radeon HD 4770. (explain)

Radeon HD 4850 1GB 25000 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1000 (4%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4770 is superior to the Radeon HD 4850 1GB, though not by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4850 1GB 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

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Radeon HD 4850 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 4850 1GB
Manufacturer AMD AMD
Year Apr 28, 2009 Jun 25, 2008
Code Name RV740 RV770 PRO
Memory 512 MB 1024 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 max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory 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 4850 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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