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Radeon HD 4670 512MB vs Radeon HD 6950 2GB

Intro

The Radeon HD 4670 512MB has a clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory frequency of 1000 MHz. It also features a 128-bit bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Compare all of that to the Radeon HD 6950 2GB, which has a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It features 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 130 Watts (186%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6950 2GB should in theory be quite a bit superior to the Radeon HD 4670 512MB in general. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 4670 512MB 32000 MB/sec
Difference: 128000 (400%)

Texel Rate

The Radeon HD 6950 2GB is a lot (approximately 193%) better at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 4670 512MB 24000 Mtexels/sec
Difference: 46400 (193%)

Pixel Rate

The Radeon HD 6950 2GB is quite a bit (more or less 327%) faster with regards to AA than the Radeon HD 4670 512MB, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 6950 2GB 25600 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 19600 (327%)

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 4670 512MB

Amazon.com

Check prices at:

Radeon HD 6950 2GB

Amazon.com

Check prices at:

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 4670 512MB Radeon HD 6950 2GB
Manufacturer AMD AMD
Year Sep 10, 2008 December 2010
Code Name RV730 XT Cayman Pro
Memory 512 MB 2048 MB
Core Speed 750 MHz 800 MHz
Memory Speed 2000 MHz 5000 MHz
Power (Max TDP) 70 watts 200 watts
Bandwidth 32000 MB/sec 160000 MB/sec
Texel Rate 24000 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 6000 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 320(64x5) 1408
Texture Mapping Units 32 88
Render Output Units 8 32
Bus Type GDDR4/GDDR3/DDR3/DDR2 GDDR5
Bus Width 128-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 514 million 2640 million
Bus PCIe 2.0 x16, AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4670 512MB

Amazon.com

Check prices at:

Radeon HD 6950 2GB

Amazon.com

Check prices at:

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.

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