Radeon HD 4670 512MB vs Radeon HD 6450 (OEM) 1GB

Intro

Compare that to the Radeon HD 6450 (OEM) 1GB, which uses a 40 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this model. It features 160 SPUs as well as 8 Texture Address Units and 4 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 4670 512MB		70 Watts
	Difference: 39 Watts (126%)

Memory Bandwidth

In theory, the Radeon HD 4670 512MB should be 11% faster than the Radeon HD 6450 (OEM) 1GB in general, because of its greater data rate. (explain)

Radeon HD 4670 512MB		32000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 3200 (11%)

Texel Rate

The Radeon HD 4670 512MB will be quite a bit (about 300%) faster with regards to anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 18000 (300%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4670 512MB is superior to the Radeon HD 6450 (OEM) 1GB, by a large margin. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 3000 (100%)

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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units 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 bandwidth is, the lower the ability to reach the maximum fill rate.