Radeon HD 4650 512MB vs Radeon HD 6450 (OEM)

Intro

Compare all of that to the Radeon HD 6450 (OEM), which comes with a core clock speed of 625 MHz and a GDDR3 memory speed of 800 MHz. It also features a 64-bit bus, and makes use of a 40 nm design. It is made up of 160 SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 24 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 4650 512MB will be 25% faster than the Radeon HD 6450 (OEM) in general, due to its higher bandwidth. (explain)

Radeon HD 4650 512MB		16000 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The Radeon HD 4650 512MB should be a lot (approximately 284%) faster with regards to texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 14200 (284%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 4650 512MB is the winner, by far. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 2300 (92%)

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 MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.