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GeForce GTX 850M vs Radeon HD 4770

Intro

The GeForce GTX 850M has a GPU core clock speed of 876 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 128-bit bus. It also is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 4770, which comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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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

As far as performance goes, the Radeon HD 4770 should theoretically be much superior to 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 is quite a bit (approximately 46%) more effective at 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 lots of anti-aliasing is important to you, then the GeForce GTX 850M is the winner, but only just. (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

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GeForce GTX 850M

Amazon.com

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Radeon HD 4770

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 850M Radeon HD 4770
Manufacturer nVidia AMD
Year March 12 2014 Apr 28, 2009
Code Name GM107 RV740
Memory 2048 MB 512 MB
Core Speed 876 MHz 750 MHz
Memory Speed 2000 MHz 3200 MHz
Power (Max TDP) 40 watts 80 watts
Bandwidth 32000 MB/sec 51200 MB/sec
Texel Rate 35040 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 14016 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 640 640(128x5)
Texture Mapping Units 40 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 40 nm
Transistors (Unknown) million 826 million
Bus PCIe 3.0 x16 PCIe 2.0 x16
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce GTX 850M

Amazon.com

Check prices at:

Radeon HD 4770

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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