GeForce 830M vs Radeon HD 4890 1GB

Intro

Compare those specifications to the Radeon HD 4890 1GB, which features a clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 165 Watts (660%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 1GB should perform a lot faster than the GeForce 830M in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 110400 (767%)

Texel Rate

The Radeon HD 4890 1GB is quite a bit (more or less 143%) better at AF than the GeForce 830M. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 23536 (143%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4890 1GB is a better choice, by far. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 7768 (94%)

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 MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.