Compare any two graphics cards:
GeForce 8800 GT 512MB vs GeForce GT 340
IntroThe GeForce 8800 GT 512MB has core clock speeds of 600 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 memory. It features 112 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.
Compare those specifications to the GeForce GT 340, which uses a 40 nm design. nVidia has set the core frequency at 550 MHz. The GDDR5 RAM works at a speed of 850 MHz on this specific card. It features 96 SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
In theory, the GeForce 8800 GT 512MB should be 6% quicker than the GeForce GT 340 overall, due to its greater bandwidth. (explain)
Texel RateThe GeForce 8800 GT 512MB will be much (more or less 91%) faster with regards to texture filtering than the GeForce GT 340. (explain)
Pixel RateThe GeForce 8800 GT 512MB will be a lot (approximately 118%) faster with regards to AA than the GeForce GT 340, and should be capable of handling higher resolutions more effectively. (explain)
Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB 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 the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant 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.