GeForce GTX 870M vs Radeon HD 4670 512MB

Intro

Compare all that to the Radeon HD 4670 512MB, which has a GPU core clock speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 memory running at 1000 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
GeForce GTX 870M		110 Watts
	Difference: 40 Watts (57%)

Memory Bandwidth

In theory, the GeForce GTX 870M should be a lot faster than the Radeon HD 4670 512MB overall. (explain)

GeForce GTX 870M		96000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 64000 (200%)

Texel Rate

The GeForce GTX 870M will be a lot (about 339%) faster with regards to anisotropic filtering than the Radeon HD 4670 512MB. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 81392 (339%)

Pixel Rate

The GeForce GTX 870M is much (about 276%) better at anti-aliasing than the Radeon HD 4670 512MB, and should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 16584 (276%)

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 MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many 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.