GeForce GTX 850M vs Radeon HD 4830 512MB

Intro

Compare those specifications to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has set the core frequency at 575 MHz. The GDDR3 memory is set to run at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 55 Watts (138%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4830 512MB should perform much faster than the GeForce GTX 850M overall. (explain)

Radeon HD 4830 512MB		57600 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The GeForce GTX 850M will be much (more or less 90%) more effective at texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 16640 (90%)

Pixel Rate

The GeForce GTX 850M will be a lot (about 52%) better at full screen anti-aliasing than the Radeon HD 4830 512MB, and also should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 4816 (52%)

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 (counted in megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.