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GeForce GTX 965M vs Radeon HD 4850 512MB

Intro

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

Compare those specifications to the Radeon HD 4850 512MB, which features GPU clock speed of 625 MHz, and 512 MB of GDDR3 RAM set to run at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, 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 512MB		110 Watts
	Difference: 50 Watts (83%)

Memory Bandwidth

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

GeForce GTX 965M		64000 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 448 (1%)

Texel Rate

The GeForce GTX 965M should be quite a bit (approximately 142%) faster with regards to anisotropic filtering than the Radeon HD 4850 512MB. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 35416 (142%)

Pixel Rate

If using a high resolution is important to you, then the GeForce GTX 965M is a better choice, by far. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 20208 (202%)

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 965M

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Radeon HD 4850 512MB

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Specifications

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Model	GeForce GTX 965M	Radeon HD 4850 512MB
Manufacturer	nVidia	AMD
Year	January 5 2015	Jun 25, 2008
Code Name	GM204	RV770 PRO
Memory	2048 MB	512 MB
Core Speed	944 MHz	625 MHz
Memory Speed	4000 MHz	1986 MHz
Power (Max TDP)	60 watts	110 watts
Bandwidth	64000 MB/sec	63552 MB/sec
Texel Rate	60416 Mtexels/sec	25000 Mtexels/sec
Pixel Rate	30208 Mpixels/sec	10000 Mpixels/sec
Unified Shaders	1024	800(160x5)
Texture Mapping Units	64	40
Render Output Units	32	16
Bus Type	GDDR5	GDDR3
Bus Width	128-bit	256-bit
Fab Process	28 nm	55 nm
Transistors	(Unknown) million	956 million
Bus	PCIe 3.0 x16	PCIe 2.0 x16
DirectX Version	DirectX 12	DirectX 10.1
OpenGL Version	OpenGL 4.5	OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few 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.

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