Radeon HD 6450 (OEM) 1GB vs Radeon HD 7950 3GB

Intro

Compare that to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this card. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 169 Watts (545%)

Memory Bandwidth

The Radeon HD 7950 3GB should theoretically be much faster than the Radeon HD 6450 (OEM) 1GB overall. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 211200 (733%)

Texel Rate

The Radeon HD 7950 3GB should be quite a bit (more or less 1393%) better at texture filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 83600 (1393%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7950 3GB is superior to the Radeon HD 6450 (OEM) 1GB, and very much so. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 22600 (753%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 are applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.