GeForce 8800 GT 512MB vs GeForce GTX 650

Intro

Compare all that to the GeForce GTX 650, which features core clock speeds of 1058 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 41 Watts (64%)

Memory Bandwidth

The GeForce GTX 650 should theoretically be a lot faster than the GeForce 8800 GT 512MB overall. (explain)

GeForce GTX 650		80000 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 22400 (39%)

Texel Rate

The GeForce GTX 650 should be a small bit (about 1%) better at anisotropic filtering than the GeForce 8800 GT 512MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 256 (1%)

Pixel Rate

The GeForce GTX 650 will be quite a bit (about 76%) better at full screen anti-aliasing than the GeForce 8800 GT 512MB, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 7328 (76%)

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 data (counted in MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.