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GeForce 820M vs GeForce 8600 GT 256MB DDR2

Intro

The GeForce 820M uses a 28 nm design. nVidia has set the core speed at 719 MHz. The DDR3 memory is set to run at a speed of 1000 MHz on this particular card. It features 96 SPUs as well as 16 Texture Address Units and 4 ROPs.

Compare all that to the GeForce 8600 GT 256MB DDR2, which uses a 80 nm design. nVidia has set the core frequency at 540 MHz. The DDR2 memory runs at a speed of 400 MHz on this specific card. It features 32 SPUs along with 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 8600 GT 256MB DDR2 47 Watts
Difference: 32 Watts (213%)

Memory Bandwidth

In theory, the GeForce 820M should be much faster than the GeForce 8600 GT 256MB DDR2 overall. (explain)

GeForce 820M 16000 MB/sec
GeForce 8600 GT 256MB DDR2 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 820M should be a lot (approximately 33%) more effective at AF than the GeForce 8600 GT 256MB DDR2. (explain)

GeForce 820M 11504 Mtexels/sec
GeForce 8600 GT 256MB DDR2 8640 Mtexels/sec
Difference: 2864 (33%)

Pixel Rate

The GeForce 8600 GT 256MB DDR2 should be a lot (more or less 50%) faster with regards to anti-aliasing than the GeForce 820M, and should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce 8600 GT 256MB DDR2 4320 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 1444 (50%)

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

Amazon.com

Check prices at:

GeForce 8600 GT 256MB DDR2

Amazon.com

Check prices at:

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 8600 GT 256MB DDR2
Manufacturer nVidia nVidia
Year February 2014 April 2007
Code Name GF117 G84
Memory 2048 MB 256 MB
Core Speed 719 MHz 540 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 15 watts 47 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 11504 Mtexels/sec 8640 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 4320 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 80 nm
Transistors (Unknown) million 289 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the 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 the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

GeForce 8600 GT 256MB DDR2

Amazon.com

Check prices at:

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.

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