GeForce 840M vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which uses a 28 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM runs at a speed of 1375 MHz on this specific card. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
Radeon R9 M295X		125 Watts
	Difference: 95 Watts (317%)

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should in theory be a lot better than the GeForce 840M overall. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 160000 (1000%)

Texel Rate

The Radeon R9 M295X is a lot (approximately 289%) more effective at texture filtering than the GeForce 840M. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 71304 (289%)

Pixel Rate

The Radeon R9 M295X will be much (approximately 192%) faster with regards to full screen anti-aliasing than the GeForce 840M, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 15768 (192%)

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 data (in units of MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.