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

Intro

Compare all that to the Radeon HD 6450 (OEM), which uses a 40 nm design. AMD has set the core frequency at 625 MHz. The GDDR3 RAM runs at a frequency of 800 MHz on this specific model. It features 160 SPUs along with 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 4850 2GB		110 Watts
	Difference: 79 Watts (255%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 2GB will be 397% quicker than the Radeon HD 6450 (OEM) in general, due to its greater bandwidth. (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 will be a lot (about 400%) faster with regards to anisotropic filtering 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

If running with high levels of AA is important to you, then the Radeon HD 4850 2GB is superior to the Radeon HD 6450 (OEM), by a large margin. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 reach the max fill rate.