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GeForce GT 240 GDDR5 1GB vs Radeon HD 4770

Intro

The GeForce GT 240 GDDR5 1GB features a GPU core clock speed of 550 MHz, and the 1024 MB of GDDR5 RAM is set to run at 850 MHz through a 128-bit bus. It also is comprised of 96 SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Compare those specs to the Radeon HD 4770, which comes with core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon HD 4770		80 Watts
	Difference: 10 Watts (14%)

Memory Bandwidth

Performance-wise, the GeForce GT 240 GDDR5 1GB should theoretically be a little bit better than the Radeon HD 4770 in general. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4770 will be a lot (approximately 36%) more effective at texture filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 6400 (36%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is superior to the GeForce GT 240 GDDR5 1GB, by a large margin. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 7600 (173%)

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 GT 240 GDDR5 1GB

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Radeon HD 4770

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Specifications

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Model	GeForce GT 240 GDDR5 1GB	Radeon HD 4770
Manufacturer	nVidia	AMD
Year	November 2009	Apr 28, 2009
Code Name	GT215	RV740
Memory	1024 MB	512 MB
Core Speed	550 MHz	750 MHz
Memory Speed	3400 MHz	3200 MHz
Power (Max TDP)	70 watts	80 watts
Bandwidth	54400 MB/sec	51200 MB/sec
Texel Rate	17600 Mtexels/sec	24000 Mtexels/sec
Pixel Rate	4400 Mpixels/sec	12000 Mpixels/sec
Unified Shaders	96	640(128x5)
Texture Mapping Units	32	32
Render Output Units	8	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
Fab Process	40 nm	40 nm
Transistors	289 million	826 million
Bus	PCIe x16	PCIe 2.0 x16
DirectX Version	DirectX 10.1	DirectX 10.1
OpenGL Version	OpenGL 3.2	OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

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

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