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GeForce GTS 450 1GB vs Radeon HD 4770

Intro

The GeForce GTS 450 1GB features clock speeds of 783 MHz on the GPU, and 902 MHz on the 1024 MB of GDDR5 memory. It features 192 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 4770, which uses a 40 nm design. AMD has set the core speed at 750 MHz. The GDDR5 RAM runs at a frequency of 800 MHz on this model. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 26 Watts (33%)

Memory Bandwidth

In theory, the GeForce GTS 450 1GB should be 13% quicker than the Radeon HD 4770 in general, because of its greater bandwidth. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 6528 (13%)

Texel Rate

The GeForce GTS 450 1GB will be a little bit (approximately 4%) faster with regards to AF than the Radeon HD 4770. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 1056 (4%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTS 450 1GB is superior to the Radeon HD 4770, not by a very large margin though. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 528 (4%)

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 GTS 450 1GB

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Radeon HD 4770

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Specifications

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Model	GeForce GTS 450 1GB	Radeon HD 4770
Manufacturer	nVidia	AMD
Year	September 2010	Apr 28, 2009
Code Name	GF106	RV740
Memory	1024 MB	512 MB
Core Speed	783 MHz	750 MHz
Memory Speed	3608 MHz	3200 MHz
Power (Max TDP)	106 watts	80 watts
Bandwidth	57728 MB/sec	51200 MB/sec
Texel Rate	25056 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	12528 Mpixels/sec	12000 Mpixels/sec
Unified Shaders	192	640(128x5)
Texture Mapping Units	32	32
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	40 nm	40 nm
Transistors	1170 million	826 million
Bus	PCIe x16	PCIe 2.0 x16
DirectX Version	DirectX 11	DirectX 10.1
OpenGL Version	OpenGL 4.1	OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of 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 per second.

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

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