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GeForce GTX 650 Ti 2GB vs Radeon HD 7770

Intro

The GeForce GTX 650 Ti 2GB uses a 28 nm design. nVidia has clocked the core speed at 928 MHz. The GDDR5 memory is set to run at a speed of 1350 MHz on this model. It features 768 SPUs along with 64 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 1125 MHz on this particular card. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
GeForce GTX 650 Ti 2GB		110 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 Ti 2GB should be 20% quicker than the Radeon HD 7770 overall, because of its greater data rate. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The GeForce GTX 650 Ti 2GB is quite a bit (more or less 48%) better at AF than the Radeon HD 7770. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 19392 (48%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7770 is the winner, though not by far. (explain)

Radeon HD 7770		16000 Mpixels/sec
GeForce GTX 650 Ti 2GB		14848 Mpixels/sec
	Difference: 1152 (8%)

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 650 Ti 2GB

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Radeon HD 7770

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Specifications

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Model	GeForce GTX 650 Ti 2GB	Radeon HD 7770
Manufacturer	nVidia	AMD
Year	October 2012	February 2012
Code Name	GK106	Cape Verde XT
Memory	2048 MB	1024 MB
Core Speed	928 MHz	1000 MHz
Memory Speed	5400 MHz	4500 MHz
Power (Max TDP)	110 watts	80 watts
Bandwidth	86400 MB/sec	72000 MB/sec
Texel Rate	59392 Mtexels/sec	40000 Mtexels/sec
Pixel Rate	14848 Mpixels/sec	16000 Mpixels/sec
Unified Shaders	768	640
Texture Mapping Units	64	40
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	28 nm
Transistors	2540 million	1500 million
Bus	PCIe 3.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 11.0	DirectX 11.1
OpenGL Version	OpenGL 4.3	OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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