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Radeon HD 7850 vs Radeon HD 7970

Intro

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

Compare all that to the Radeon HD 7970, which uses a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 RAM works at a speed of 1375 MHz on this particular card. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

(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

The Radeon HD 7970 should theoretically be much faster than 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 should be quite a bit (approximately 115%) better 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

The Radeon HD 7970 will be just a bit (more or less 8%) more effective at AA than the Radeon HD 7850, and should be able to handle higher screen resolutions while still performing well. (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

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

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: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, 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 maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max 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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