GeForce 940M vs Radeon HD 4750

Intro

Compare that to the Radeon HD 4750, which comes with clock speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4750 should be 220% quicker than the GeForce 940M overall, because of its higher bandwidth. (explain)

Radeon HD 4750		51200 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 35200 (220%)

Texel Rate

The GeForce 940M is a bit (more or less 10%) faster with regards to AF than the Radeon HD 4750. (explain)

GeForce 940M		25728 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 2368 (10%)

Pixel Rate

The Radeon HD 4750 will be a lot (about 36%) better at full screen anti-aliasing than the GeForce 940M, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 3104 (36%)

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 (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.