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Radeon HD 4850 512MB vs Radeon HD 7850


Intro

The Radeon HD 4850 512MB features a core clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Compare all that to the Radeon HD 7850, which features a clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1024 SPUs, 64 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB 110 Watts
Radeon HD 7850 130 Watts
Difference: 20 Watts (18%)

Memory Bandwidth

The Radeon HD 7850, in theory, should be quite a bit faster than the Radeon HD 4850 512MB in general. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 4850 512MB 63552 MB/sec
Difference: 90048 (142%)

Texel Rate

The Radeon HD 7850 will be a lot (approximately 120%) faster with regards to texture filtering than the Radeon HD 4850 512MB. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 4850 512MB 25000 Mtexels/sec
Difference: 30040 (120%)

Pixel Rate

The Radeon HD 7850 is a lot (approximately 175%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 512MB, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 4850 512MB 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

Radeon HD 4850 512MB

Radeon HD 7850

Specifications

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Model Radeon HD 4850 512MB Radeon HD 7850
Manufacturer AMD AMD
Year Jun 25, 2008 March 2012
Code Name RV770 PRO Pitcairn Pro
Memory 512 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 GDDR3 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 max amount of information (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 4850 512MB

Radeon HD 7850

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