GeForce GTX 850M vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which makes use of a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this card. It features 2048 SPUs as well as 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

Radeon HD 7990		15520 points
GeForce GTX 850M		3340 points
	Difference: 12180 (365%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
GeForce GTX 850M		49 Sol/s
	Difference: 464 (947%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 7990		375 Watts
	Difference: 335 Watts (838%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 will be 1700% quicker than the GeForce GTX 850M in general, due to its greater data rate. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 544000 (1700%)

Texel Rate

The Radeon HD 7990 should be much (approximately 594%) better at texture filtering than the GeForce GTX 850M. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 850M		35040 Mtexels/sec
	Difference: 208160 (594%)

Pixel Rate

The Radeon HD 7990 will be quite a bit (about 334%) more effective at AA than the GeForce GTX 850M, and will be capable of handling higher resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 850M		14016 Mpixels/sec
	Difference: 46784 (334%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it 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 number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.