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GeForce 840M vs GeForce 8500 GT

Intro

The GeForce 840M features core 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 specifications to the GeForce 8500 GT, which makes use of a 80 nm design. nVidia has set the core frequency at 450 MHz. The DDR2 RAM runs at a speed of 400 MHz on this particular model. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
GeForce 8500 GT 45 Watts
Difference: 15 Watts (50%)

Memory Bandwidth

In theory, the GeForce 840M should be quite a bit faster than the GeForce 8500 GT overall. (explain)

GeForce 840M 16000 MB/sec
GeForce 8500 GT 12800 MB/sec
Difference: 3200 (25%)

Texel Rate

The GeForce 840M will be much (about 586%) better at anisotropic filtering than the GeForce 8500 GT. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 21096 (586%)

Pixel Rate

The GeForce 840M should be a lot (about 357%) faster with regards to FSAA than the GeForce 8500 GT, and also should be able to handle higher resolutions more effectively. (explain)

GeForce 840M 8232 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 6432 (357%)

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

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GeForce 8500 GT

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 840M GeForce 8500 GT
Manufacturer nVidia nVidia
Year March 12 2014 April 2007
Code Name GM108 G86
Memory 2048 MB 512 MB
Core Speed 1029 MHz 450 MHz
Memory Speed 2000 MHz 800 MHz
Power (Max TDP) 30 watts 45 watts
Bandwidth 16000 MB/sec 12800 MB/sec
Texel Rate 24696 Mtexels/sec 3600 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 1800 Mpixels/sec
Unified Shaders 384 16
Texture Mapping Units 24 8
Render Output Units 8 4
Bus Type DDR3 DDR2
Bus Width 64-bit 128-bit
Fab Process 28 nm 80 nm
Transistors (Unknown) million 210 million
Bus PCIe 3.0 x16 PCIe x16, PCI, PCIe x16 2.0
DirectX Version DirectX 12 DirectX 10
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

Display Prices

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GeForce 840M

Amazon.com

Check prices at:

GeForce 8500 GT

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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