GeForce 920M vs Radeon HD 7770

Intro

Compare all of that to the Radeon HD 7770, which has clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs along with 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 7770		3180 points
GeForce 920M		1180 points
	Difference: 2000 (169%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 7770 should in theory be much faster than the GeForce 920M in general. (explain)

Radeon HD 7770		72000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 57600 (400%)

Texel Rate

The Radeon HD 7770 should be much (approximately 31%) better at anisotropic filtering than the GeForce 920M. (explain)

Radeon HD 7770		40000 Mtexels/sec
GeForce 920M		30528 Mtexels/sec
	Difference: 9472 (31%)

Pixel Rate

The Radeon HD 7770 is a lot (approximately 110%) more effective at AA than the GeForce 920M, and should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce 920M		7632 Mpixels/sec
	Difference: 8368 (110%)

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 maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 can be processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the 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 the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.