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Radeon HD 4850 2GB vs Radeon HD 7850

Intro

The Radeon HD 4850 2GB makes use of a 55 nm design. AMD has set the core frequency at 625 MHz. The GDDR4 RAM runs at a speed of 993 MHz on this model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 7850, which features a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1024 Stream Processors, 64 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB 110 Watts
Radeon HD 7850 130 Watts
Difference: 20 Watts (18%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be quite a bit superior to the Radeon HD 4850 2GB overall. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 90048 (142%)

Texel Rate

The Radeon HD 7850 is quite a bit (approximately 120%) faster with regards to anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 30040 (120%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7850 is a better choice, by a large margin. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 17520 (175%)

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 4850 2GB

Amazon.com

Check prices at:

Radeon HD 7850

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 4850 2GB Radeon HD 7850
Manufacturer AMD AMD
Year Jun 25, 2008 March 2012
Code Name RV770 PRO Pitcairn Pro
Memory 2048 MB 2048 MB
Core Speed 625 MHz 860 MHz
Memory Speed 1986 MHz 4800 MHz
Power (Max TDP) 110 watts 130 watts
Bandwidth 63552 MB/sec 153600 MB/sec
Texel Rate 25000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 800(160x5) 1024
Texture Mapping Units 40 64
Render Output Units 16 32
Bus Type GDDR4 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 956 million 2800 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video 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. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. 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 is also dependant on lots of 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

Hide Prices

Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 7850

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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