GeForce 825M vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which comes with a clock speed of 860 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit bus, and uses a 28 nm design. It is made up of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon HD 7850		130 Watts
	Difference: 97 Watts (294%)

Memory Bandwidth

Theoretically, the Radeon HD 7850 should be a lot faster than the GeForce 825M in general. (explain)

Radeon HD 7850		153600 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 139200 (967%)

Texel Rate

The Radeon HD 7850 is much (about 305%) more effective at anisotropic filtering than the GeForce 825M. (explain)

Radeon HD 7850		55040 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 41440 (305%)

Pixel Rate

The Radeon HD 7850 is quite a bit (approximately 305%) more effective at anti-aliasing than the GeForce 825M, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7850		27520 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 20720 (305%)

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 data (in units of MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once 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 AA, HDR and higher screen resolutions.

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

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