GeForce GTX 880M vs Radeon HD 4830 512MB

Intro

Compare all of that to the Radeon HD 4830 512MB, which features a core clock frequency of 575 MHz and a GDDR3 memory speed of 900 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
GeForce GTX 880M		130 Watts
	Difference: 35 Watts (37%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should be 122% quicker than the Radeon HD 4830 512MB in general, due to its higher data rate. (explain)

GeForce GTX 880M		128000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 70400 (122%)

Texel Rate

The GeForce GTX 880M is a lot (approximately 564%) more effective at AF than the Radeon HD 4830 512MB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 103712 (564%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 880M is superior to the Radeon HD 4830 512MB, and very much so. (explain)

GeForce GTX 880M		30528 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 21328 (232%)

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 (in units of megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once 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 number of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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