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GeForce 8800 GTS (G80) 640MB vs GeForce GT 340

Intro

The GeForce 8800 GTS (G80) 640MB features a core clock frequency of 513 MHz and a GDDR3 memory frequency of 792 MHz. It also uses a 320-bit memory bus, and makes use of a 90 nm design. It is made up of 96 SPUs, 48 Texture Address Units, and 20 ROPs.

Compare those specifications to the GeForce GT 340, which has GPU core speed of 550 MHz, and 512 MB of GDDR5 memory running at 850 MHz through a 128-bit bus. It also is made up of 96 SPUs, 32 TAUs, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 74 Watts (107%)

Memory Bandwidth

The GeForce 8800 GTS (G80) 640MB should in theory be a bit faster than the GeForce GT 340 in general. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 8960 (16%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB will be a lot (more or less 40%) faster with regards to anisotropic filtering than the GeForce GT 340. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 7024 (40%)

Pixel Rate

The GeForce 8800 GTS (G80) 640MB is much (about 133%) faster with regards to AA than the GeForce GT 340, and will be able to handle higher resolutions while still performing well. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 5860 (133%)

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 8800 GTS (G80) 640MB

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Specifications

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Model	GeForce 8800 GTS (G80) 640MB	GeForce GT 340
Manufacturer	nVidia	nVidia
Year	Nov 2006 (640)	February 2010
Code Name	G80	GT215
Memory	640 MB	512 MB
Core Speed	513 MHz	550 MHz
Memory Speed	1584 MHz	3400 MHz
Power (Max TDP)	143 watts	69 watts
Bandwidth	63360 MB/sec	54400 MB/sec
Texel Rate	24624 Mtexels/sec	17600 Mtexels/sec
Pixel Rate	10260 Mpixels/sec	4400 Mpixels/sec
Unified Shaders	96	96
Texture Mapping Units	48	32
Render Output Units	20	8
Bus Type	GDDR3	GDDR5
Bus Width	320-bit	128-bit
Fab Process	90 nm	40 nm
Transistors	681 million	727 million
Bus	PCIe x16	PCIe x16
DirectX Version	DirectX 10	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 applied per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to 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 max fill rate.

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