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GeForce GTX 965M vs Radeon HD 3870 X2 512MB

Intro

The GeForce GTX 965M uses a 28 nm design. nVidia has set the core speed at 944 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this particular card. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon HD 3870 X2 512MB, which comes with core clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 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

Memory Bandwidth

The Radeon HD 3870 X2 512MB, in theory, should be quite a bit faster than the GeForce GTX 965M in general. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
GeForce GTX 965M 64000 MB/sec
Difference: 51200 (80%)

Texel Rate

The GeForce GTX 965M will be much (approximately 129%) faster with regards to AF than the Radeon HD 3870 X2 512MB. (explain)

GeForce GTX 965M 60416 Mtexels/sec
Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Difference: 34016 (129%)

Pixel Rate

The GeForce GTX 965M should be a bit (about 14%) better at AA than the Radeon HD 3870 X2 512MB, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 965M 30208 Mpixels/sec
Radeon HD 3870 X2 512MB 26400 Mpixels/sec
Difference: 3808 (14%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTX 965M

Amazon.com

Check prices at:

Radeon HD 3870 X2 512MB

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 965M Radeon HD 3870 X2 512MB
Manufacturer nVidia AMD
Year January 5 2015 Jan 28, 2008
Code Name GM204 R680
Memory 2048 MB 512 MB (x2)
Core Speed 944 MHz 825 MHz (x2)
Memory Speed 4000 MHz 1800 MHz (x2)
Power (Max TDP) 60 watts (Unknown) watts
Bandwidth 64000 MB/sec 115200 MB/sec
Texel Rate 60416 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 30208 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 1024 320(64x5) (x2)
Texture Mapping Units 64 16 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce GTX 965M

Amazon.com

Check prices at:

Radeon HD 3870 X2 512MB

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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