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GeForce GTX 850M vs Radeon HD 3690/3830

Intro

The GeForce GTX 850M uses a 28 nm design. nVidia has set the core speed at 876 MHz. The DDR3 memory runs at a frequency of 1000 MHz on this model. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 3690/3830, which has clock speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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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

Performance-wise, the GeForce GTX 850M should in theory be quite a bit better 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 should be quite a bit (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

The GeForce GTX 850M is much (more or less 31%) faster with regards to FSAA than the Radeon HD 3690/3830, and also will be able to handle higher screen resolutions without losing too much performance. (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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential 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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