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

Intro

Compare those specs to the Radeon HD 6450 (OEM), which features clock speeds of 625 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 memory. It features 160 SPUs as well as 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 512MB		110 Watts
	Difference: 79 Watts (255%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 512MB will be 397% quicker than the Radeon HD 6450 (OEM) overall, due to its greater bandwidth. (explain)

Radeon HD 4850 512MB		63552 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 50752 (397%)

Texel Rate

The Radeon HD 4850 512MB should be a lot (approximately 400%) faster with regards to texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 20000 (400%)

Pixel Rate

The Radeon HD 4850 512MB will be much (approximately 300%) more effective at FSAA than the Radeon HD 6450 (OEM), and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4850 512MB		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 (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.