GeForce GTX 850M vs Radeon HD 4670 1GB

Intro

Compare that to the Radeon HD 4670 1GB, which has core clock speeds of 750 MHz on the GPU, and 1100 MHz on the 1024 MB of GDDR4/GDDR3/DDR3/DDR2 RAM. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 4670 1GB		70 Watts
	Difference: 30 Watts (75%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4670 1GB should perform a little bit faster than the GeForce GTX 850M in general. (explain)

Radeon HD 4670 1GB		35200 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 3200 (10%)

Texel Rate

The GeForce GTX 850M will be a lot (about 46%) more effective at texture filtering than the Radeon HD 4670 1GB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 11040 (46%)

Pixel Rate

The GeForce GTX 850M should be a lot (approximately 134%) faster with regards to full screen anti-aliasing than the Radeon HD 4670 1GB, and also able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 8016 (134%)

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 data (measured in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.