Submit Benchmarks!

Submit SSD Benchmark
Submit GPU Benchmark

Compare any two graphics cards:
VS

GeForce 825M vs GeForce 840M

Intro

The GeForce 825M uses a 28 nm design. nVidia has set the core speed at 850 MHz. The DDR3 RAM runs at a frequency of 900 MHz on this specific card. It features 384 SPUs along with 16 TAUs and 8 ROPs.

Compare those specs to the GeForce 840M, which uses a 28 nm design. nVidia has set the core frequency at 1029 MHz. The DDR3 RAM runs at a frequency of 1000 MHz on this specific card. It features 384 SPUs as well as 24 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 840M 30 Watts
GeForce 825M 33 Watts
Difference: 3 Watts (10%)

Memory Bandwidth

The GeForce 840M should in theory be a bit faster than the GeForce 825M in general. (explain)

GeForce 840M 16000 MB/sec
GeForce 825M 14400 MB/sec
Difference: 1600 (11%)

Texel Rate

The GeForce 840M is a lot (about 82%) faster with regards to AF than the GeForce 825M. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 11096 (82%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 840M is the winner, by a large margin. (explain)

GeForce 840M 8232 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 1432 (21%)

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

Display Prices

Hide Prices

GeForce 825M

Amazon.com

Check prices at:

GeForce 840M

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

Display Specifications

Hide Specifications

Model GeForce 825M GeForce 840M
Manufacturer nVidia nVidia
Year January 27 2014 March 12 2014
Code Name GK208 GM108
Memory 2048 MB 2048 MB
Core Speed 850 MHz 1029 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 33 watts 30 watts
Bandwidth 14400 MB/sec 16000 MB/sec
Texel Rate 13600 Mtexels/sec 24696 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 8232 Mpixels/sec
Unified Shaders 384 384
Texture Mapping Units 16 24
Render Output Units 8 8
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x8 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at 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 could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 825M

Amazon.com

Check prices at:

GeForce 840M

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.

Comments

Be the first to leave a comment!

Your email address will not be published. Required fields are marked *


*

WordPress Anti Spam by WP-SpamShield