GeForce 8800 Ultra vs GeForce GTX 650

Intro

Compare that to the GeForce GTX 650, which uses a 28 nm design. nVidia has clocked the core frequency at 1058 MHz. The GDDR5 RAM runs at a speed of 1250 MHz on this particular card. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

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 be 30% faster than the GeForce GTX 650 in general, because of its greater data rate. (explain)

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

Texel Rate

The GeForce 8800 Ultra should be a small bit (approximately 16%) better at anisotropic filtering than the GeForce GTX 650. (explain)

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

Pixel Rate

The GeForce GTX 650 is just a bit (about 15%) better at full screen anti-aliasing than the GeForce 8800 Ultra, and also should be able to handle higher screen resolutions better. (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 past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 are applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.