GeForce 940M vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which has core speeds of 600 MHz on the GPU, and 700 MHz on the 1024 MB of GDDR3 RAM. It features 320(64x5) SPUs along with 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 overall, 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 is a lot (more or less 34%) more effective 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

If using a high resolution is important to you, then the GeForce 940M is the winner, by a large margin. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.