Radeon HD 4850 512MB vs Radeon HD 6450 (OEM) 1GB

Intro

Compare all that to the Radeon HD 6450 (OEM) 1GB, which comes with GPU core speed of 750 MHz, and 1024 MB of GDDR5 RAM set to run at 900 MHz through a 64-bit bus. It also features 160 Stream Processors, 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 4850 512MB		110 Watts
	Difference: 79 Watts (255%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 512MB should in theory be quite a bit superior to the Radeon HD 6450 (OEM) 1GB overall. (explain)

Radeon HD 4850 512MB		63552 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 34752 (121%)

Texel Rate

The Radeon HD 4850 512MB is a lot (approximately 317%) faster with regards to AF than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 19000 (317%)

Pixel Rate

The Radeon HD 4850 512MB is a lot (more or less 233%) more effective at anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 512MB		10000 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 7000 (233%)

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 (measured in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units by the core 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 applied 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 figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on 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 potential to reach the max fill rate.