GeForce GTX 870M vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which features GPU clock speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also is made up of 800 Stream Processors, 40 Texture Address Units, and 16 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 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

Performance-wise, the GeForce GTX 870M should theoretically be quite a bit superior to 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 will be quite a bit (more or less 193%) faster with regards to 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 using a high screen resolution is important to you, then the GeForce GTX 870M is the winner, and very much so. (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 maximum amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.