GeForce GTX 850M vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which comes with clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs along with 32 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
Radeon HD 4770		80 Watts
	Difference: 40 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4770 should be quite a bit faster than the GeForce GTX 850M in general. (explain)

Radeon HD 4770		51200 MB/sec
GeForce GTX 850M		32000 MB/sec
	Difference: 19200 (60%)

Texel Rate

The GeForce GTX 850M will be quite a bit (approximately 46%) faster with regards to AF than the Radeon HD 4770. (explain)

GeForce GTX 850M		35040 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 11040 (46%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 850M is the winner, though only just barely. (explain)

GeForce GTX 850M		14016 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 2016 (17%)

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 max amount of information (measured in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be 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 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 most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.