GeForce GTX 850M vs Radeon HD 4670 1GB

Intro

Compare those specifications 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 TAUs and 8 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 4670 1GB		70 Watts
	Difference: 30 Watts (75%)

Memory Bandwidth

Performance-wise, the Radeon HD 4670 1GB should theoretically be just a bit superior to the GeForce GTX 850M overall. (explain)

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

Texel Rate

The GeForce GTX 850M should be a lot (more or less 46%) faster with regards to AF 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 much (more or less 134%) faster with regards to FSAA than the Radeon HD 4670 1GB, and will be capable of handling higher 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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few 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.