GeForce 840M vs Radeon R9 290X

Intro

Compare all that to the Radeon R9 290X, which features a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 512-bit bus, and uses a 28 nm design. It is made up of 2816 SPUs, 176 TAUs, and 64 ROPs.

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 quite a bit better than the GeForce 840M in general. (explain)

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

Texel Rate

The Radeon R9 290X is quite a bit (about 470%) more effective at anisotropic filtering 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 is a lot (approximately 522%) better at anti-aliasing than the GeForce 840M, and also will be capable of handling higher resolutions without slowing down too much. (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: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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 potential to reach the maximum fill rate.