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GeForce 820M vs GeForce 8600 GT 256MB DDR2

Intro

The GeForce 820M features a core clock frequency of 719 MHz and a DDR3 memory speed of 1000 MHz. It also features a 64-bit memory bus, and makes use of a 28 nm design. It is comprised of 96 SPUs, 16 Texture Address Units, and 4 ROPs.

Compare those specifications to the GeForce 8600 GT 256MB DDR2, which comes with a core clock frequency of 540 MHz and a DDR2 memory speed of 400 MHz. It also uses a 128-bit memory bus, and makes use of a 80 nm design. It is made up of 32 SPUs, 16 TAUs, 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

As far as performance goes, the GeForce 820M should in theory be a lot superior to the GeForce 8600 GT 256MB DDR2 in general. (explain)

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

Texel Rate

The GeForce 820M should be much (about 33%) faster with regards to 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

If using high levels of AA is important to you, then the GeForce 8600 GT 256MB DDR2 is superior to the GeForce 820M, by far. (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

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GeForce 8600 GT 256MB DDR2

Amazon.com

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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 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 past the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max 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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