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GeForce GTX 850M vs Radeon HD 3850 256MB

Intro

The GeForce GTX 850M has a core clock speed of 876 MHz and a DDR3 memory speed of 1000 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 3850 256MB, which makes use of a 55 nm design. AMD has clocked the core speed at 668 MHz. The GDDR3 RAM runs at a speed of 828 MHz on this particular model. 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 3850 256MB 75 Watts
Difference: 35 Watts (88%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3850 256MB should be 66% quicker than the GeForce GTX 850M in general, because of its higher data rate. (explain)

Radeon HD 3850 256MB 52992 MB/sec
GeForce GTX 850M 32000 MB/sec
Difference: 20992 (66%)

Texel Rate

The GeForce GTX 850M should be a lot (approximately 228%) better at texture filtering than the Radeon HD 3850 256MB. (explain)

GeForce GTX 850M 35040 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 24352 (228%)

Pixel Rate

The GeForce GTX 850M is a lot (approximately 31%) more effective at AA than the Radeon HD 3850 256MB, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 850M 14016 Mpixels/sec
Radeon HD 3850 256MB 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 3850 256MB

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 3850 256MB
Manufacturer nVidia AMD
Year March 12 2014 Nov 19, 2007
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 52992 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 256-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

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

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory 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 3850 256MB

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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