GeForce GTX 870M vs Geforce GTX 770

Intro

Compare those specs to the Geforce GTX 770, which features a clock frequency of 1046 MHz and a GDDR5 memory frequency of 1753 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 128 TAUs, and 32 Raster Operation 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

Geforce GTX 770		7854 points
GeForce GTX 870M		4770 points
	Difference: 3084 (65%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 870M		110 Watts
Geforce GTX 770		230 Watts
	Difference: 120 Watts (109%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 770 should perform a lot faster than the GeForce GTX 870M in general. (explain)

Geforce GTX 770		224384 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 128384 (134%)

Texel Rate

The Geforce GTX 770 should be much (more or less 27%) better at AF than the GeForce GTX 870M. (explain)

Geforce GTX 770		133888 Mtexels/sec
GeForce GTX 870M		105392 Mtexels/sec
	Difference: 28496 (27%)

Pixel Rate

The Geforce GTX 770 will be a lot (about 48%) better at AA than the GeForce GTX 870M, and also able to handle higher resolutions without slowing down too much. (explain)

Geforce GTX 770		33472 Mpixels/sec
GeForce GTX 870M		22584 Mpixels/sec
	Difference: 10888 (48%)

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 largest amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling 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 the graphics card could possibly write to its local memory in a 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 - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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.