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Radeon HD 7850 vs Radeon HD 7970

Intro

The Radeon HD 7850 comes with a core clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 32 Raster Operation Units.

Compare those specs to the Radeon HD 7970, which has a clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also makes use of a 384-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 7970 250 Watts
Difference: 120 Watts (92%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7970 should in theory be a lot superior to the Radeon HD 7850 overall. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 110400 (72%)

Texel Rate

The Radeon HD 7970 is a lot (approximately 115%) more effective at anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 63360 (115%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 7970 is the winner, not by a very large margin though. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 2080 (8%)

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 7850

Amazon.com

Radeon HD 7970

Amazon.com

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 7850 Radeon HD 7970
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn Pro Tahiti XT
Memory 2048 MB 3072 MB
Core Speed 860 MHz 925 MHz
Memory Speed 4800 MHz 5500 MHz
Power (Max TDP) 130 watts 250 watts
Bandwidth 153600 MB/sec 264000 MB/sec
Texel Rate 55040 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1024 2048
Texture Mapping Units 64 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video 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 maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant 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.

Comments

One Response to “Radeon HD 7850 vs Radeon HD 7970”
arnold says:

para la diferencia que tiene me quedo con la 7850 aparte para masturbarme no importa la vga jajaja a cagarce a pajas amigos

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