GeForce GTX 870M vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which makes use of a 40 nm design. AMD has clocked the core speed at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this model. It features 800 SPUs as well as 40 Texture Address Units and 16 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

GeForce GTX 870M		4770 points
Radeon HD 6770		1520 points
	Difference: 3250 (214%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
GeForce GTX 870M		110 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

The GeForce GTX 870M, in theory, should be a lot faster than the Radeon HD 6770 in general. (explain)

GeForce GTX 870M		96000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 28800 (43%)

Texel Rate

The GeForce GTX 870M should be a lot (more or less 193%) better at anisotropic filtering than the Radeon HD 6770. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 69392 (193%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 870M is the winner, by far. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 8184 (57%)

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 largest amount of information (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.