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GeForce 840M vs GeForce 8600 GT 512MB DDR2

Intro

The GeForce 840M has clock speeds of 1029 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the GeForce 8600 GT 512MB DDR2, which comes with GPU clock speed of 540 MHz, and 512 MB of DDR2 RAM set to run at 400 MHz through a 128-bit bus. It also is comprised of 32 Stream Processors, 16 Texture Address Units, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
GeForce 8600 GT 512MB DDR2 47 Watts
Difference: 17 Watts (57%)

Memory Bandwidth

Performance-wise, the GeForce 840M should theoretically be a lot better than the GeForce 8600 GT 512MB DDR2 in general. (explain)

GeForce 840M 16000 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be a lot (about 186%) better at anisotropic filtering than the GeForce 8600 GT 512MB DDR2. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 16056 (186%)

Pixel Rate

The GeForce 840M should be quite a bit (more or less 91%) faster with regards to AA than the GeForce 8600 GT 512MB DDR2, and also capable of handling higher resolutions while still performing well. (explain)

GeForce 840M 8232 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 3912 (91%)

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 840M

Amazon.com

Check prices at:

GeForce 8600 GT 512MB 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 840M GeForce 8600 GT 512MB DDR2
Manufacturer nVidia nVidia
Year March 12 2014 April 2007
Code Name GM108 G84
Memory 2048 MB 512 MB
Core Speed 1029 MHz 540 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 30 watts 47 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 24696 Mtexels/sec 8640 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 4320 Mpixels/sec
Unified Shaders 384 32
Texture Mapping Units 24 16
Render Output Units 8 8
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 80 nm
Transistors (Unknown) million 289 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel 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.

Display Prices

Hide Prices

GeForce 840M

Amazon.com

Check prices at:

GeForce 8600 GT 512MB 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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