GeForce 820M vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which features a GPU core clock speed of 900 MHz, and 512 MB of GDDR5 memory set to run at 1050 MHz through a 128-bit bus. It also features 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6770		1520 points
GeForce 820M		850 points
	Difference: 670 (79%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 6770		108 Watts
	Difference: 93 Watts (620%)

Memory Bandwidth

Performance-wise, the Radeon HD 6770 should theoretically be much better than the GeForce 820M overall. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 51200 (320%)

Texel Rate

The Radeon HD 6770 is a lot (approximately 213%) better at anisotropic filtering than the GeForce 820M. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 24496 (213%)

Pixel Rate

The Radeon HD 6770 will be a lot (about 401%) faster with regards to anti-aliasing than the GeForce 820M, and should be capable of handling higher resolutions better. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 11524 (401%)

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 largest amount of data (in units of MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its 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 the core 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 also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.