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Radeon HD 6970 vs Radeon HD 7850

Intro

The Radeon HD 6970 has a clock frequency of 880 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare that to the Radeon HD 7850, which comes with a clock speed of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses 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.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6970 250 Watts
Difference: 120 Watts (92%)

Memory Bandwidth

In theory, the Radeon HD 6970 will be 15% faster than the Radeon HD 7850 overall, because of its higher data rate. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 22400 (15%)

Texel Rate

The Radeon HD 6970 will be much (more or less 53%) faster with regards to anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 29440 (53%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6970 is superior to the Radeon HD 7850, though not by far. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 640 (2%)

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 6970

Amazon.com

Radeon HD 7850

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 6970 Radeon HD 7850
Manufacturer AMD AMD
Year December 2010 March 2012
Code Name Cayman XT Pitcairn Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 880 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1375 MHz (5500 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1536 1024
Texture Mapping Units 96 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 250 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 176000 MB/sec 153600 MB/sec
Texel Rate 84480 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be applied per second. This figure is calculated by multiplying the total amount of texture units 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs 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 also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

One Response to “Radeon HD 6970 vs Radeon HD 7850”
Anonymous says:
[...] viel von der Leistung her, lediglich braucht die 7850 weniger Strom und hat den neueren Chip. Radeon HD 6970 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare Verkaufe GW2 Acc mit Lvl80 Guardian & 5G (gold/orange equippt) Hardware: Bitfenix Prodigy [...]

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