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Radeon HD 7850 vs Radeon HD 7970

Intro

The Radeon HD 7850 makes use of a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this particular model. It features 1024 SPUs as well as 64 Texture Address Units and 32 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7970, which features GPU clock speed of 925 MHz, and 3072 MB of GDDR5 memory set to run at 1375 MHz through a 384-bit bus. It also is comprised of 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

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

In theory, the Radeon HD 7970 should be 72% quicker than the Radeon HD 7850 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7970 is quite a bit (more or less 115%) faster with regards to AF than the Radeon HD 7850. (explain)

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

Pixel Rate

The Radeon HD 7970 should be just a bit (about 8%) faster with regards to AA than the Radeon HD 7850, and also should be able to handle higher resolutions without losing too much performance. (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
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 860 MHz 925 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1375 MHz (5500 MHz effective)
Unified Shaders 1024 2048
Texture Mapping Units 64 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 130 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 264000 MB/sec
Texel Rate 55040 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card 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 processed in a 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 amount of Render Output Units by the the core 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach 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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