GeForce 820M vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which features core speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 RAM. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 80 Watts (533%)

Memory Bandwidth

The Radeon HD 4830 1GB, in theory, should be a lot faster than the GeForce 820M in general. (explain)

Radeon HD 4830 1GB		57600 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 41600 (260%)

Texel Rate

The Radeon HD 4830 1GB should be much (approximately 60%) better at anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 4830 1GB		18400 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 6896 (60%)

Pixel Rate

The Radeon HD 4830 1GB is quite a bit (more or less 220%) more effective at AA than the GeForce 820M, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 4830 1GB		9200 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 6324 (220%)

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 information (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, 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 record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.