GeForce GTX 970M vs Radeon HD 4830 512MB

Intro

Compare that to the Radeon HD 4830 512MB, which makes use of a 55 nm design. AMD has set the core speed at 575 MHz. The GDDR3 memory works at a frequency of 900 MHz on this specific model. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 970M		75 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 20 Watts (27%)

Memory Bandwidth

The GeForce GTX 970M, in theory, should be quite a bit faster than the Radeon HD 4830 512MB overall. (explain)

GeForce GTX 970M		96000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The GeForce GTX 970M is quite a bit (about 302%) more effective at anisotropic filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 970M		73920 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 55520 (302%)

Pixel Rate

The GeForce GTX 970M is a lot (approximately 382%) more effective at FSAA than the Radeon HD 4830 512MB, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 970M		44352 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 35152 (382%)

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 (counted in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.