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GeForce GTX 965M vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 965M comes with core speeds of 944 MHz on the GPU, and 1000 MHz on the 2048 MB of GDDR5 RAM. It features 1024 SPUs along with 64 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 4850 X2 512MB, which features a core clock frequency of 625 MHz and a GDDR3 memory speed of 993 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M 60 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 190 Watts (317%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 X2 512MB should in theory be much better than the GeForce GTX 965M in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
GeForce GTX 965M 64000 MB/sec
Difference: 63104 (99%)

Texel Rate

The GeForce GTX 965M is much (approximately 21%) better at anisotropic filtering than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 965M 60416 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 10416 (21%)

Pixel Rate

The GeForce GTX 965M will be much (more or less 51%) faster with regards to FSAA than the Radeon HD 4850 X2 512MB, and will be able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 965M 30208 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 10208 (51%)

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 4850 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 4850 X2 512MB
Manufacturer nVidia AMD
Year January 5 2015 Nov 7, 2008
Code Name GM204 R700
Memory 2048 MB 512 MB (x2)
Core Speed 944 MHz 625 MHz (x2)
Memory Speed 4000 MHz 1986 MHz (x2)
Power (Max TDP) 60 watts 250 watts
Bandwidth 64000 MB/sec 127104 MB/sec
Texel Rate 60416 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 30208 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 1024 800(160x5) (x2)
Texture Mapping Units 64 40 (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 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses 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 amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core 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 fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GTX 965M

Amazon.com

Check prices at:

Radeon HD 4850 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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