Radeon HD 3690/3830 vs Radeon HD 6450 (OEM)

Intro

Compare those specifications to the Radeon HD 6450 (OEM), which features a core clock speed of 625 MHz and a GDDR3 memory speed of 800 MHz. It also uses a 64-bit memory bus, and uses a 40 nm design. It is made up of 160 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 3690/3830		75 Watts
	Difference: 44 Watts (142%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3690/3830 should be much faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon HD 3690/3830		26496 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 13696 (107%)

Texel Rate

The Radeon HD 3690/3830 will be quite a bit (about 114%) more effective at AF than the Radeon HD 6450 (OEM). (explain)

Radeon HD 3690/3830		10688 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 5688 (114%)

Pixel Rate

The Radeon HD 3690/3830 should be quite a bit (about 328%) more effective at AA than the Radeon HD 6450 (OEM), and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 3690/3830		10688 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 8188 (328%)

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 data (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video 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 number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.