GeForce GTX 850M vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which features core speeds of 575 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. 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

The Radeon HD 4830 512MB, in theory, should be a lot 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 (approximately 90%) better at AF 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 much (about 52%) faster with regards to anti-aliasing than the Radeon HD 4830 512MB, and able to handle higher screen 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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once 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 can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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