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GeForce GTX 850M vs Radeon HD 3690/3830

Intro

The GeForce GTX 850M comes with a core clock speed of 876 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 3690/3830, which makes use of a 55 nm design. AMD has set the core speed at 668 MHz. The GDDR3 memory runs at a frequency of 828 MHz on this specific model. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M 40 Watts
Radeon HD 3690/3830 75 Watts
Difference: 35 Watts (88%)

Memory Bandwidth

The GeForce GTX 850M, in theory, should be much faster than the Radeon HD 3690/3830 in general. (explain)

GeForce GTX 850M 32000 MB/sec
Radeon HD 3690/3830 26496 MB/sec
Difference: 5504 (21%)

Texel Rate

The GeForce GTX 850M is a lot (more or less 228%) more effective at AF than the Radeon HD 3690/3830. (explain)

GeForce GTX 850M 35040 Mtexels/sec
Radeon HD 3690/3830 10688 Mtexels/sec
Difference: 24352 (228%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 850M is superior to the Radeon HD 3690/3830, and very much so. (explain)

GeForce GTX 850M 14016 Mpixels/sec
Radeon HD 3690/3830 10688 Mpixels/sec
Difference: 3328 (31%)

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

Check prices at:

Radeon HD 3690/3830

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.

Specifications

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Model GeForce GTX 850M Radeon HD 3690/3830
Manufacturer nVidia AMD
Year March 12 2014 2008
Code Name GM107 RV670 PRO
Memory 2048 MB 256 MB
Core Speed 876 MHz 668 MHz
Memory Speed 2000 MHz 1656 MHz
Power (Max TDP) 40 watts 75 watts
Bandwidth 32000 MB/sec 26496 MB/sec
Texel Rate 35040 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 14016 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 640 320(64x5)
Texture Mapping Units 40 16
Render Output Units 16 16
Bus Type DDR3 GDDR3
Bus Width 128-bit 128-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) 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: Bandwidth is the largest amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster 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 can be applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTX 850M

Amazon.com

Check prices at:

Radeon HD 3690/3830

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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