Radeon HD 6450 (OEM) 1GB vs Radeon HD 6950 2GB

Intro

Compare those specs to the Radeon HD 6950 2GB, which uses a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this specific model. It features 1408 SPUs along with 88 Texture Address Units 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 6950 2GB		200 Watts
	Difference: 169 Watts (545%)

Memory Bandwidth

The Radeon HD 6950 2GB should in theory be a lot faster than the Radeon HD 6450 (OEM) 1GB in general. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 131200 (456%)

Texel Rate

The Radeon HD 6950 2GB should be much (about 1073%) better at AF than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 64400 (1073%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6950 2GB is the winner, by far. (explain)

Radeon HD 6950 2GB		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: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.