GeForce 830M vs Radeon HD 7970

Intro

Compare that to the Radeon HD 7970, which comes with a clock speed of 925 MHz and a GDDR5 memory frequency of 1375 MHz. It also features a 384-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
Radeon HD 7970		250 Watts
	Difference: 225 Watts (900%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should perform a lot faster than the GeForce 830M overall. (explain)

Radeon HD 7970		264000 MB/sec
GeForce 830M		14400 MB/sec
	Difference: 249600 (1733%)

Texel Rate

The Radeon HD 7970 is much (more or less 619%) more effective at texture filtering than the GeForce 830M. (explain)

Radeon HD 7970		118400 Mtexels/sec
GeForce 830M		16464 Mtexels/sec
	Difference: 101936 (619%)

Pixel Rate

The Radeon HD 7970 will be much (approximately 260%) more effective at FSAA than the GeForce 830M, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7970		29600 Mpixels/sec
GeForce 830M		8232 Mpixels/sec
	Difference: 21368 (260%)

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 information (measured in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.