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Radeon HD 4650 512MB vs Radeon HD 6950 2GB

Intro

The Radeon HD 4650 512MB uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The DDR2 RAM works at a frequency of 500 MHz on this model. It features 320(64x5) SPUs as well as 32 TAUs and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6950 2GB, which has a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, 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 2GB 200 Watts
Difference: 145 Watts (264%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 2GB is 900% quicker than the Radeon HD 4650 512MB overall, because of its higher data rate. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 144000 (900%)

Texel Rate

The Radeon HD 6950 2GB should be a lot (about 267%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 51200 (267%)

Pixel Rate

The Radeon HD 6950 2GB should be quite a bit (about 433%) more effective at AA than the Radeon HD 4650 512MB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6950 2GB 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

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Radeon HD 6950 2GB

Amazon.com

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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 2GB
Manufacturer AMD AMD
Year Sep 10, 2008 December 2010
Code Name RV730 PRO Cayman Pro
Memory 512 MB 2048 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 largest amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to 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 potential to get to the max fill rate.

Display Prices

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Radeon HD 4650 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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