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GeForce GTX 965M vs Radeon HD 3870 X2 1GB

Intro

The GeForce GTX 965M makes use of a 28 nm design. nVidia has clocked the core frequency at 944 MHz. The GDDR5 memory works at a speed of 1000 MHz on this model. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Compare all of that to the Radeon HD 3870 X2 1GB, which features a clock frequency of 825 MHz and a GDDR4 memory speed of 1126 MHz. It also features a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 X2 1GB should in theory be quite a bit superior to the GeForce GTX 965M in general. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce GTX 965M 64000 MB/sec
Difference: 80128 (125%)

Texel Rate

The GeForce GTX 965M will be much (about 129%) more effective at AF than the Radeon HD 3870 X2 1GB. (explain)

GeForce GTX 965M 60416 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 34016 (129%)

Pixel Rate

The GeForce GTX 965M will be a bit (about 14%) better at full screen anti-aliasing than the Radeon HD 3870 X2 1GB, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 965M 30208 Mpixels/sec
Radeon HD 3870 X2 1GB 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 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.

Specifications

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Model GeForce GTX 965M Radeon HD 3870 X2 1GB
Manufacturer nVidia AMD
Year January 5 2015 Jan 28, 2008
Code Name GM204 R680
Memory 2048 MB 1024 MB (x2)
Core Speed 944 MHz 825 MHz (x2)
Memory Speed 4000 MHz 2252 MHz (x2)
Power (Max TDP) 60 watts (Unknown) watts
Bandwidth 64000 MB/sec 144128 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 GDDR4
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 largest amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability 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 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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