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GeForce GTX 965M vs Radeon HD 5770

Intro

The GeForce GTX 965M uses a 28 nm design. nVidia has clocked the core speed at 944 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this specific model. It features 1024 SPUs along with 64 TAUs and 32 ROPs.

Compare that to the Radeon HD 5770, which has clock speeds of 850 MHz on the GPU, and 1200 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 965M		60 Watts
Radeon HD 5770		108 Watts
	Difference: 48 Watts (80%)

Memory Bandwidth

In theory, the Radeon HD 5770 should be 20% faster than the GeForce GTX 965M overall, due to its greater data rate. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTX 965M		64000 MB/sec
	Difference: 12800 (20%)

Texel Rate

The GeForce GTX 965M will be much (more or less 78%) more effective at anisotropic filtering than the Radeon HD 5770. (explain)

GeForce GTX 965M		60416 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 26416 (78%)

Pixel Rate

The GeForce GTX 965M is much (more or less 122%) faster with regards to AA than the Radeon HD 5770, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 965M		30208 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 16608 (122%)

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 5770

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Specifications

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Model	GeForce GTX 965M	Radeon HD 5770
Manufacturer	nVidia	AMD
Year	January 5 2015	October 13, 2009
Code Name	GM204	Juniper XT
Memory	2048 MB	1024 MB
Core Speed	944 MHz	850 MHz
Memory Speed	4000 MHz	4800 MHz
Power (Max TDP)	60 watts	108 watts
Bandwidth	64000 MB/sec	76800 MB/sec
Texel Rate	60416 Mtexels/sec	34000 Mtexels/sec
Pixel Rate	30208 Mpixels/sec	13600 Mpixels/sec
Unified Shaders	1024	800(160x5)
Texture Mapping Units	64	40
Render Output Units	32	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	40 nm
Transistors	(Unknown) million	1040 million
Bus	PCIe 3.0 x16	PCIe 2.1 x16
DirectX Version	DirectX 12	DirectX 11
OpenGL Version	OpenGL 4.5	OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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