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Radeon HD 6450 (OEM) 1GB vs Radeon HD 6570 (OEM) 2GB

Intro

The Radeon HD 6450 (OEM) 1GB has a core clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also features a 64-bit bus, and makes use of a 40 nm design. It is made up of 160 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare all of that to the Radeon HD 6570 (OEM) 2GB, which has a GPU core clock speed of 650 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB 31 Watts
Radeon HD 6570 (OEM) 2GB 50 Watts
Difference: 19 Watts (61%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6570 (OEM) 2GB should be 122% quicker than the Radeon HD 6450 (OEM) 1GB overall, due to its greater bandwidth. (explain)

Radeon HD 6570 (OEM) 2GB 64000 MB/sec
Radeon HD 6450 (OEM) 1GB 28800 MB/sec
Difference: 35200 (122%)

Texel Rate

The Radeon HD 6570 (OEM) 2GB is quite a bit (approximately 160%) faster with regards to texture filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 6570 (OEM) 2GB 15600 Mtexels/sec
Radeon HD 6450 (OEM) 1GB 6000 Mtexels/sec
Difference: 9600 (160%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6570 (OEM) 2GB is a better choice, by a large margin. (explain)

Radeon HD 6570 (OEM) 2GB 5200 Mpixels/sec
Radeon HD 6450 (OEM) 1GB 3000 Mpixels/sec
Difference: 2200 (73%)

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 6450 (OEM) 1GB

Amazon.com

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Radeon HD 6570 (OEM) 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 6450 (OEM) 1GB Radeon HD 6570 (OEM) 2GB
Manufacturer AMD AMD
Year February 2011 February 2011
Code Name Caicos Turks
Memory 1024 MB 1024 MB
Core Speed 750 MHz 650 MHz
Memory Speed 3600 MHz 4000 MHz
Power (Max TDP) 31 watts 50 watts
Bandwidth 28800 MB/sec 64000 MB/sec
Texel Rate 6000 Mtexels/sec 15600 Mtexels/sec
Pixel Rate 3000 Mpixels/sec 5200 Mpixels/sec
Unified Shaders 160 480
Texture Mapping Units 8 24
Render Output Units 4 8
Bus Type GDDR5 GDDR5
Bus Width 64-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 370 million 715 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 6450 (OEM) 1GB

Amazon.com

Check prices at:

Radeon HD 6570 (OEM) 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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