GeForce GTX 880M vs Radeon HD 6950 2GB

Intro

Compare those specifications to the Radeon HD 6950 2GB, which features a clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 70 Watts (54%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 2GB is 25% quicker than the GeForce GTX 880M overall, due to its greater data rate. (explain)

Radeon HD 6950 2GB		160000 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 32000 (25%)

Texel Rate

The GeForce GTX 880M is much (about 73%) more effective at texture filtering than the Radeon HD 6950 2GB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon HD 6950 2GB		70400 Mtexels/sec
	Difference: 51712 (73%)

Pixel Rate

The GeForce GTX 880M will be just a bit (more or less 19%) better at AA than the Radeon HD 6950 2GB, and should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon HD 6950 2GB		25600 Mpixels/sec
	Difference: 4928 (19%)

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 (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 - the lower the bandwidth is, the lower the ability to get to the max fill rate.