GeForce 8400 GS 512MB vs GeForce GTX 980

Intro

Compare that to the GeForce GTX 980, which features GPU clock speed of 1126 MHz, and 4096 MB of GDDR5 memory running at 1750 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 980		165 Watts
	Difference: 125 Watts (313%)

Memory Bandwidth

The GeForce GTX 980 should theoretically be quite a bit faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 980		224000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 217600 (3400%)

Texel Rate

The GeForce GTX 980 will be much (about 2672%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 980		144128 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 138928 (2672%)

Pixel Rate

The GeForce GTX 980 will be a lot (about 2672%) more effective at FSAA than the GeForce 8400 GS 512MB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 980		72064 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 69464 (2672%)

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 max amount of information (measured in MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.