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GeForce 8800 GTX vs GeForce GT 450 (OEM)

Intro

The GeForce 8800 GTX features clock speeds of 575 MHz on the GPU, and 900 MHz on the 768 MB of GDDR3 RAM. It features 128 SPUs along with 64 Texture Address Units and 24 ROPs.

Compare all that to the GeForce GT 450 (OEM), which has core speeds of 790 MHz on the GPU, and 1000 MHz on the 1536 MB of GDDR5 RAM. It features 144 SPUs as well as 24 Texture Address Units and 24 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
GeForce 8800 GTX		155 Watts
	Difference: 49 Watts (46%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 450 (OEM) should perform a bit faster than the GeForce 8800 GTX in general. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
GeForce 8800 GTX		86400 MB/sec
	Difference: 9600 (11%)

Texel Rate

The GeForce 8800 GTX will be much (about 94%) faster with regards to AF than the GeForce GT 450 (OEM). (explain)

GeForce 8800 GTX		36800 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 17840 (94%)

Pixel Rate

The GeForce GT 450 (OEM) is much (approximately 37%) faster with regards to AA than the GeForce 8800 GTX, and will be capable of handling higher screen resolutions better. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 5160 (37%)

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 GTX

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GeForce GT 450 (OEM)

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model	GeForce 8800 GTX	GeForce GT 450 (OEM)
Manufacturer	nVidia	nVidia
Year	Nov 2006	October 2010
Code Name	G80	GF106
Memory	768 MB	1536 MB
Core Speed	575 MHz	790 MHz
Memory Speed	1800 MHz	4000 MHz
Power (Max TDP)	155 watts	106 watts
Bandwidth	86400 MB/sec	96000 MB/sec
Texel Rate	36800 Mtexels/sec	18960 Mtexels/sec
Pixel Rate	13800 Mpixels/sec	18960 Mpixels/sec
Unified Shaders	128	144
Texture Mapping Units	64	24
Render Output Units	24	24
Bus Type	GDDR3	GDDR5
Bus Width	384-bit	192-bit
Fab Process	90 nm	40 nm
Transistors	681 million	1170 million
Bus	PCIe x16	PCIe x16
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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