GeForce 840M vs Radeon R9 290X

Intro

Compare those specs to the Radeon R9 290X, which uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this model. It features 2816 SPUs along with 176 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon R9 290X		10609 points
GeForce 840M		1600 points
	Difference: 9009 (563%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
Radeon R9 290X		300 Watts
	Difference: 270 Watts (900%)

Memory Bandwidth

Performance-wise, the Radeon R9 290X should in theory be a lot superior to the GeForce 840M overall. (explain)

Radeon R9 290X		320000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 304000 (1900%)

Texel Rate

The Radeon R9 290X is much (more or less 470%) more effective at AF than the GeForce 840M. (explain)

Radeon R9 290X		140800 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 116104 (470%)

Pixel Rate

The Radeon R9 290X will be a lot (more or less 522%) faster with regards to anti-aliasing than the GeForce 840M, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 290X		51200 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 42968 (522%)

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 max amount of data (counted in megabytes per second) that can be transferred over 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 it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 can be applied per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.