GeForce 830M vs Radeon HD 7790

Intro

Compare all that to the Radeon HD 7790, which comes with core speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon HD 7790		85 Watts
	Difference: 60 Watts (240%)

Memory Bandwidth

The Radeon HD 7790 should in theory be quite a bit faster than the GeForce 830M in general. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 81600 (567%)

Texel Rate

The Radeon HD 7790 is much (approximately 240%) more effective at texture filtering than the GeForce 830M. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 39536 (240%)

Pixel Rate

The Radeon HD 7790 will be much (more or less 94%) better at FSAA than the GeForce 830M, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7790		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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.