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Radeon HD 4670 512MB vs Radeon HD 6950 2GB

Intro

The Radeon HD 4670 512MB features a GPU clock speed of 750 MHz, and the 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM is set to run at 1000 MHz through a 128-bit bus. It also is comprised of 320(64x5) Stream Processors, 32 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 6950 2GB, which uses a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this specific card. It features 1408 SPUs as well as 88 Texture Address Units and 32 Rasterization Operator Units.

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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 better than the Radeon HD 4670 512MB overall. (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 (more or less 193%) better at AF 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 will be a lot (about 327%) more effective at AA than the Radeon HD 4670 512MB, and will be able to handle higher resolutions without slowing down too much. (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 information (measured in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must 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 AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics 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 number of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max 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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