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GeForce 820M vs GeForce 9500 GT DDR2

Intro

The GeForce 820M makes use of a 28 nm design. nVidia has clocked the core frequency at 719 MHz. The DDR3 RAM works at a speed of 1000 MHz on this particular model. It features 96 SPUs along with 16 TAUs and 4 ROPs.

Compare those specs to the GeForce 9500 GT DDR2, which has a clock frequency of 550 MHz and a DDR2 memory speed of 500 MHz. It also features a 128-bit bus, and makes use of a 65 nm design. It features 32 SPUs, 16 Texture Address Units, and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
GeForce 9500 GT DDR2		50 Watts
	Difference: 35 Watts (233%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The GeForce 820M will be quite a bit (about 31%) more effective at texture filtering than the GeForce 9500 GT DDR2. (explain)

GeForce 820M		11504 Mtexels/sec
GeForce 9500 GT DDR2		8800 Mtexels/sec
	Difference: 2704 (31%)

Pixel Rate

The GeForce 9500 GT DDR2 will be a lot (approximately 53%) faster with regards to AA than the GeForce 820M, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 9500 GT DDR2		4400 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 1524 (53%)

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 820M

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GeForce 9500 GT DDR2

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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 820M	GeForce 9500 GT DDR2
Manufacturer	nVidia	nVidia
Year	February 2014	July 2008
Code Name	GF117	G96a
Memory	2048 MB	256 MB
Core Speed	719 MHz	550 MHz
Memory Speed	2000 MHz	1000 MHz
Power (Max TDP)	15 watts	50 watts
Bandwidth	16000 MB/sec	16000 MB/sec
Texel Rate	11504 Mtexels/sec	8800 Mtexels/sec
Pixel Rate	2876 Mpixels/sec	4400 Mpixels/sec
Unified Shaders	96	32
Texture Mapping Units	16	16
Render Output Units	4	8
Bus Type	DDR3	DDR2
Bus Width	64-bit	128-bit
Fab Process	28 nm	65 nm
Transistors	(Unknown) million	314 million
Bus	PCIe 2.0 x16	PCIe x16 2.0, PCI
DirectX Version	DirectX 12	DirectX 10
OpenGL Version	OpenGL 4.5	OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per 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 number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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