GeForce 840M vs GeForce GTX 880M

Intro

Compare all of that to the GeForce GTX 880M, which features GPU clock speed of 954 MHz, and 4096 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also features 1536 SPUs, 128 TAUs, and 32 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

GeForce GTX 880M		6360 points
GeForce 840M		1600 points
	Difference: 4760 (298%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M		30 Watts
GeForce GTX 880M		130 Watts
	Difference: 100 Watts (333%)

Memory Bandwidth

In theory, the GeForce GTX 880M should perform much faster than the GeForce 840M in general. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce 840M		16000 MB/sec
	Difference: 112000 (700%)

Texel Rate

The GeForce GTX 880M should be quite a bit (approximately 394%) more effective at anisotropic filtering than the GeForce 840M. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 97416 (394%)

Pixel Rate

The GeForce GTX 880M is a lot (more or less 271%) faster with regards to AA than the GeForce 840M, and should be capable of handling higher resolutions better. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 22296 (271%)

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 information (in units of MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 memory bandwidth is, the lower the ability to reach the max fill rate.