GeForce 940M vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which features GPU clock speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the Radeon HD 4770 should be much faster than the GeForce 940M overall. (explain)

Radeon HD 4770		51200 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 35200 (220%)

Texel Rate

The GeForce 940M is just a bit (about 7%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

GeForce 940M		25728 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 1728 (7%)

Pixel Rate

The Radeon HD 4770 is a lot (more or less 40%) faster with regards to full screen anti-aliasing than the GeForce 940M, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 3424 (40%)

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 (measured in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out 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 outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.