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GeForce GTX 850M vs Radeon HD 4670 1GB

Intro

The GeForce GTX 850M makes use of a 28 nm design. nVidia has clocked the core speed at 876 MHz. The DDR3 RAM is set to run at a speed of 1000 MHz on this specific model. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 4670 1GB, which comes with GPU clock speed of 750 MHz, and 1024 MB of GDDR4/GDDR3/DDR3/DDR2 memory set to run at 1100 MHz through a 128-bit bus. It also is comprised of 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M 40 Watts
Radeon HD 4670 1GB 70 Watts
Difference: 30 Watts (75%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 1GB should in theory be a small bit superior to the GeForce GTX 850M overall. (explain)

Radeon HD 4670 1GB 35200 MB/sec
GeForce GTX 850M 32000 MB/sec
Difference: 3200 (10%)

Texel Rate

The GeForce GTX 850M should be much (about 46%) more effective at texture filtering than the Radeon HD 4670 1GB. (explain)

GeForce GTX 850M 35040 Mtexels/sec
Radeon HD 4670 1GB 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, by a large margin. (explain)

GeForce GTX 850M 14016 Mpixels/sec
Radeon HD 4670 1GB 6000 Mpixels/sec
Difference: 8016 (134%)

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 4670 1GB

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 4670 1GB
Manufacturer nVidia AMD
Year March 12 2014 Sep 10, 2008
Code Name GM107 RV730 XT
Memory 2048 MB 1024 MB
Core Speed 876 MHz 750 MHz
Memory Speed 2000 MHz 2200 MHz
Power (Max TDP) 40 watts 70 watts
Bandwidth 32000 MB/sec 35200 MB/sec
Texel Rate 35040 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 14016 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 640 320(64x5)
Texture Mapping Units 40 32
Render Output Units 16 8
Bus Type DDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 128-bit 128-bit
Fab Process 28 nm 55 nm
Transistors (Unknown) million 514 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: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video 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 amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - 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 4670 1GB

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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