GeForce GTX 870M vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which comes with clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
GeForce GTX 870M		110 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

In theory, the GeForce GTX 870M is 25% quicker than the Radeon HD 5770 overall, due to its greater data rate. (explain)

GeForce GTX 870M		96000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 19200 (25%)

Texel Rate

The GeForce GTX 870M will be a lot (approximately 210%) more effective at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 71392 (210%)

Pixel Rate

The GeForce GTX 870M should be much (about 66%) more effective at anti-aliasing than the Radeon HD 5770, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 8984 (66%)

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 (measured in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.