Radeon HD 4550 256MB vs Radeon HD 6450 (OEM) 1GB

Intro

Compare those specs to the Radeon HD 6450 (OEM) 1GB, which makes use of a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM works at a frequency of 900 MHz on this specific card. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 256MB		25 Watts
Radeon HD 6450 (OEM) 1GB		31 Watts
	Difference: 6 Watts (24%)

Memory Bandwidth

The Radeon HD 6450 (OEM) 1GB should in theory be quite a bit faster than the Radeon HD 4550 256MB overall. (explain)

Radeon HD 6450 (OEM) 1GB		28800 MB/sec
Radeon HD 4550 256MB		12800 MB/sec
	Difference: 16000 (125%)

Texel Rate

The Radeon HD 6450 (OEM) 1GB should be much (approximately 25%) faster with regards to AF than the Radeon HD 4550 256MB. (explain)

Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
Radeon HD 4550 256MB		4800 Mtexels/sec
	Difference: 1200 (25%)

Pixel Rate

The Radeon HD 6450 (OEM) 1GB is quite a bit (more or less 25%) more effective at FSAA than the Radeon HD 4550 256MB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
Radeon HD 4550 256MB		2400 Mpixels/sec
	Difference: 600 (25%)

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 maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.