GeForce GTX 850M vs Radeon HD 5770

Intro

Compare those specs to the Radeon HD 5770, which uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory works at a speed of 1200 MHz on this particular model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 5770		108 Watts
	Difference: 68 Watts (170%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5770 should theoretically be much superior to the GeForce GTX 850M overall. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 44800 (140%)

Texel Rate

The GeForce GTX 850M will be just a bit (more or less 3%) more effective at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 1040 (3%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 850M is the winner, though not by far. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 416 (3%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.