GeForce 840M vs Radeon R9 M270X

Intro

Compare those specs to the Radeon R9 M270X, which comes with a clock speed of 725 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M270X should be a lot faster than the GeForce 840M in general. (explain)

Radeon R9 M270X		72000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 56000 (350%)

Texel Rate

The Radeon R9 M270X is a little bit (more or less 17%) faster with regards to AF than the GeForce 840M. (explain)

Radeon R9 M270X		29000 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 4304 (17%)

Pixel Rate

The Radeon R9 M270X will be much (about 41%) faster with regards to FSAA than the GeForce 840M, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M270X		11600 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 3368 (41%)

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 largest amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. 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 output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.