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GeForce GTX 870M vs Radeon R9 M385X

Intro

The GeForce GTX 870M features a clock speed of 941 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 192-bit memory bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 24 ROPs.

Compare those specifications to the Radeon R9 M385X, which features core speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should have the same performance. (explain)

Texel Rate

The GeForce GTX 870M is quite a bit (approximately 71%) faster with regards to anisotropic filtering than the Radeon R9 M385X. (explain)

GeForce GTX 870M 105392 Mtexels/sec
Radeon R9 M385X 61600 Mtexels/sec
Difference: 43792 (71%)

Pixel Rate

The GeForce GTX 870M should be a lot (approximately 28%) faster with regards to FSAA than the Radeon R9 M385X, and capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 870M 22584 Mpixels/sec
Radeon R9 M385X 17600 Mpixels/sec
Difference: 4984 (28%)

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 870M

Amazon.com

Check prices at:

Radeon R9 M385X

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 870M Radeon R9 M385X
Manufacturer nVidia AMD
Year March 12 2014 2015
Code Name GK104 Bonaire
Memory 3072 MB 4096 MB
Core Speed 941 MHz 1100 MHz
Memory Speed 4000 MHz 6000 MHz
Power (Max TDP) 110 watts (Unknown) watts
Bandwidth 96000 MB/sec 96000 MB/sec
Texel Rate 105392 Mtexels/sec 61600 Mtexels/sec
Pixel Rate 22584 Mpixels/sec 17600 Mpixels/sec
Unified Shaders 1344 896
Texture Mapping Units 112 56
Render Output Units 24 16
Bus Type GDDR5 GDDR5
Bus Width 192-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. It's 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 DDR5, multiply by 4 instead. The higher the memory bandwidth, the better 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 processed per second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTX 870M

Amazon.com

Check prices at:

Radeon R9 M385X

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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