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Radeon HD 6670 (OEM) vs Radeon HD 6950

Intro

The Radeon HD 6670 (OEM) has a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 24 Texture Address Units, and 8 ROPs.

Compare all that to the Radeon HD 6950, which makes use of a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this card. It features 1408 SPUs as well as 88 TAUs and 32 ROPs.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 6950 200 Watts
Difference: 137 Watts (217%)

Memory Bandwidth

The Radeon HD 6950 should theoretically perform much faster than the Radeon HD 6670 (OEM) in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 6670 (OEM) 64000 MB/sec
Difference: 96000 (150%)

Texel Rate

The Radeon HD 6950 is a lot (about 267%) more effective at AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 6670 (OEM) 19200 Mtexels/sec
Difference: 51200 (267%)

Pixel Rate

The Radeon HD 6950 should be much (about 300%) faster with regards to AA than the Radeon HD 6670 (OEM), and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 19200 (300%)

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 6670 (OEM)

Amazon.com

Radeon HD 6950

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 6670 (OEM) Radeon HD 6950
Manufacturer AMD AMD
Year February 2011 December 2010
Code Name Turks Cayman Pro
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 512 MB 1024 MB
Core Speed 800 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4000 MHz 5000 MHz
Unified Shaders 480 1408
Texture Mapping Units 24 88
Render Output Units 8 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 63 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 160000 MB/sec
Texel Rate 19200 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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