GeForce 840M vs GeForce 8500 GT

Intro

Compare those specifications to the GeForce 8500 GT, which has core clock speeds of 450 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 RAM. It features 16 SPUs along with 8 Texture Address Units and 4 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the GeForce 840M is 25% quicker than the GeForce 8500 GT overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce 840M is quite a bit (approximately 586%) faster with regards to texture filtering than the GeForce 8500 GT. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 840M is superior to the GeForce 8500 GT, by far. (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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.