GeForce 8800 Ultra vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which comes with GPU core speed of 1058 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 128-bit bus. It also is made up of 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce 8800 Ultra		171 Watts
	Difference: 107 Watts (167%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 Ultra should perform much faster than the GeForce GTX 650 overall. (explain)

GeForce 8800 Ultra		103680 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 23680 (30%)

Texel Rate

The GeForce 8800 Ultra will be just a bit (about 16%) more effective at texture filtering than the GeForce GTX 650. (explain)

GeForce 8800 Ultra		39168 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 5312 (16%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTX 650 is a better choice, though only just barely. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce 8800 Ultra		14688 Mpixels/sec
	Difference: 2240 (15%)

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 data (in units of megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.