Radeon HD 3870 1GB vs Radeon HD 6450 (OEM)

Intro

Compare that to the Radeon HD 6450 (OEM), which has core clock speeds of 625 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 memory. It features 160 SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 3870 1GB		106 Watts
	Difference: 75 Watts (242%)

Memory Bandwidth

The Radeon HD 3870 1GB should in theory perform a lot faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon HD 3870 1GB		72000 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 3870 1GB is quite a bit (approximately 148%) faster with regards to anisotropic filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 3870 1GB		12400 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 7400 (148%)

Pixel Rate

The Radeon HD 3870 1GB is a lot (more or less 396%) faster with regards to full screen anti-aliasing than the Radeon HD 6450 (OEM), and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 3870 1GB		12400 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 9900 (396%)

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 (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.