GeForce 830M vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which features GPU clock speed of 600 MHz, and 1024 MB of GDDR3 RAM running at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 30 Watts (120%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4650 1GB should be 56% faster than the GeForce 830M in general, because of its greater data rate. (explain)

Radeon HD 4650 1GB		22400 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 8000 (56%)

Texel Rate

The Radeon HD 4650 1GB should be a bit (more or less 17%) more effective at AF than the GeForce 830M. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 2736 (17%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 830M is a better choice, by a large margin. (explain)

GeForce 830M		8232 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 3432 (72%)

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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.