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Radeon HD 4650 1GB vs Radeon HD 6970

Intro

The Radeon HD 4650 1GB comes with a GPU clock speed of 600 MHz, and the 1024 MB of GDDR3 memory runs at 700 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

Compare that to the Radeon HD 6970, which comes with a GPU core clock speed of 880 MHz, and 2048 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 TAUs, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
Radeon HD 6970 250 Watts
Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically, the Radeon HD 6970 should perform a lot faster than the Radeon HD 4650 1GB overall. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 153600 (686%)

Texel Rate

The Radeon HD 6970 is quite a bit (approximately 340%) more effective at AF than the Radeon HD 4650 1GB. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 4650 1GB 19200 Mtexels/sec
Difference: 65280 (340%)

Pixel Rate

The Radeon HD 6970 will be a lot (about 487%) faster with regards to FSAA than the Radeon HD 4650 1GB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 23360 (487%)

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 1GB

Amazon.com

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Radeon HD 6970

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 1GB Radeon HD 6970
Manufacturer AMD AMD
Year Sep 10, 2008 December 2010
Code Name RV730 PRO Cayman XT
Memory 1024 MB 2048 MB
Core Speed 600 MHz 880 MHz
Memory Speed 1400 MHz 5500 MHz
Power (Max TDP) 55 watts 250 watts
Bandwidth 22400 MB/sec 176000 MB/sec
Texel Rate 19200 Mtexels/sec 84480 Mtexels/sec
Pixel Rate 4800 Mpixels/sec 28160 Mpixels/sec
Unified Shaders 320(64x5) 1536
Texture Mapping Units 32 96
Render Output Units 8 32
Bus Type GDDR3 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 (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 4650 1GB

Amazon.com

Check prices at:

Radeon HD 6970

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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