GeForce 920M vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which uses 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 card. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the Radeon HD 4650 512MB should theoretically be a small bit better than the GeForce 920M in general. (explain)

Radeon HD 4650 512MB		16000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 920M will be much (about 59%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

GeForce 920M		30528 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 11328 (59%)

Pixel Rate

The GeForce 920M will be quite a bit (more or less 59%) better at anti-aliasing than the Radeon HD 4650 512MB, and will be able to handle higher screen resolutions more effectively. (explain)

GeForce 920M		7632 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 2832 (59%)

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 max amount of information (counted in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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