GeForce 830M vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory runs at a speed of 1500 MHz on this card. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon HD 7790 should theoretically be quite a bit better 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 a lot (more or less 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

If using a high resolution is important to you, then the Radeon HD 7790 is a better choice, by far. (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 maximum amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 are processed in one second. This is worked out by multiplying the total number of texture units by the core clock 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 a second.

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