GeForce 920M vs Radeon HD 4670 512MB

Intro

Compare those specifications to the Radeon HD 4670 512MB, which comes with a clock speed of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1000 MHz. It also makes use of a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4670 512MB should be quite a bit faster than the GeForce 920M in general. (explain)

Radeon HD 4670 512MB		32000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 17600 (122%)

Texel Rate

The GeForce 920M is much (approximately 27%) faster with regards to anisotropic filtering than the Radeon HD 4670 512MB. (explain)

GeForce 920M		30528 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 6528 (27%)

Pixel Rate

The GeForce 920M will be a lot (more or less 27%) faster with regards to AA than the Radeon HD 4670 512MB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce 920M		7632 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 1632 (27%)

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 max amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 processed in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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 reach the maximum fill rate.