GeForce 940M vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which has a core clock frequency of 600 MHz and a GDDR3 memory speed of 700 MHz. It also uses a 128-bit memory bus, and makes use of a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4650 1GB will be 40% faster than the GeForce 940M in general, because of its higher data rate. (explain)

Radeon HD 4650 1GB		22400 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 6400 (40%)

Texel Rate

The GeForce 940M will be much (about 34%) better at texture filtering than the Radeon HD 4650 1GB. (explain)

GeForce 940M		25728 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 6528 (34%)

Pixel Rate

The GeForce 940M will be quite a bit (more or less 79%) better at anti-aliasing than the Radeon HD 4650 1GB, and should be capable of handling higher resolutions more effectively. (explain)

GeForce 940M		8576 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 3776 (79%)

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 max amount of information (measured in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 are applied per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.