GeForce 840M vs GeForce 8500 GT

Intro

Compare those specifications to the GeForce 8500 GT, which features a core clock speed of 450 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 128-bit bus, and uses a 80 nm design. It is made up of 16 SPUs, 8 TAUs, and 4 Raster Operation Units.

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 should perform much faster than the GeForce 8500 GT in general. (explain)

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

Texel Rate

The GeForce 840M will be a lot (approximately 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

If using a high resolution 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 largest amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.