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Radeon HD 4650 512MB vs Radeon HD 6950

Intro

The Radeon HD 4650 512MB comes with a clock frequency of 600 MHz and a DDR2 memory frequency of 500 MHz. It also makes use of a 128-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Compare all that to the Radeon HD 6950, which features a core clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB 55 Watts
Radeon HD 6950 200 Watts
Difference: 145 Watts (264%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 should be a lot faster than the Radeon HD 4650 512MB in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 144000 (900%)

Texel Rate

The Radeon HD 6950 should be much (more or less 267%) faster with regards to texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 51200 (267%)

Pixel Rate

The Radeon HD 6950 will be much (about 433%) more effective at full screen anti-aliasing than the Radeon HD 4650 512MB, and will be able to handle higher screen resolutions better. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 20800 (433%)

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 4650 512MB

Amazon.com

Check prices at:

Radeon HD 6950

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 4650 512MB Radeon HD 6950
Manufacturer AMD AMD
Year Sep 10, 2008 December 2010
Code Name RV730 PRO Cayman Pro
Memory 512 MB 1024 MB
Core Speed 600 MHz 800 MHz
Memory Speed 1000 MHz 5000 MHz
Power (Max TDP) 55 watts 200 watts
Bandwidth 16000 MB/sec 160000 MB/sec
Texel Rate 19200 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 320(64x5) 1408
Texture Mapping Units 32 88
Render Output Units 8 32
Bus Type 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: Bandwidth is the max amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4650 512MB

Amazon.com

Check prices at:

Radeon HD 6950

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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