Radeon HD 4850 2GB vs Radeon HD 6450 (OEM)

Intro

Compare that to the Radeon HD 6450 (OEM), which has a clock speed of 625 MHz and a GDDR3 memory speed of 800 MHz. It also features a 64-bit memory bus, and makes use of a 40 nm design. It is made up of 160 SPUs, 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)		31 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 79 Watts (255%)

Memory Bandwidth

In theory, the Radeon HD 4850 2GB should perform a lot faster than the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 4850 2GB		63552 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 2GB should be much (approximately 400%) better at AF than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 20000 (400%)

Pixel Rate

The Radeon HD 4850 2GB is much (approximately 300%) more effective at anti-aliasing than the Radeon HD 6450 (OEM), and also able to handle higher resolutions more effectively. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 7500 (300%)

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: Bandwidth is the largest amount of information (in units of MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.