GeForce 825M vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which makes use of a 55 nm design. AMD has set the core frequency at 600 MHz. The DDR2 memory runs at a speed of 500 MHz on this specific model. It features 320(64x5) SPUs along with 32 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 22 Watts (67%)

Memory Bandwidth

The Radeon HD 4650 512MB, in theory, should be just a bit faster than the GeForce 825M overall. (explain)

Radeon HD 4650 512MB		16000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The Radeon HD 4650 512MB is much (approximately 41%) better at AF than the GeForce 825M. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 5600 (41%)

Pixel Rate

The GeForce 825M will be a lot (approximately 42%) faster with regards to AA than the Radeon HD 4650 512MB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce 825M		6800 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 2000 (42%)

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 (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 in one second. This figure 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.