Radeon HD 3470 256MB vs Radeon HD 6450 (OEM)

Intro

Compare those specifications to the Radeon HD 6450 (OEM), which has a clock frequency of 625 MHz and a GDDR3 memory speed of 800 MHz. It also uses a 64-bit bus, and makes use of a 40 nm design. It is made up of 160 SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 3470 256MB should theoretically be much superior to the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 3470 256MB		30400 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 17600 (138%)

Texel Rate

The Radeon HD 6450 (OEM) should be quite a bit (more or less 56%) faster with regards to anisotropic filtering than the Radeon HD 3470 256MB. (explain)

Radeon HD 6450 (OEM)		5000 Mtexels/sec
Radeon HD 3470 256MB		3200 Mtexels/sec
	Difference: 1800 (56%)

Pixel Rate

The Radeon HD 3470 256MB will be much (about 28%) more effective at FSAA than the Radeon HD 6450 (OEM), and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 3470 256MB		3200 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 700 (28%)

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 maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.