GeForce 8800 Ultra vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which comes with a core clock frequency of 1058 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 384 SPUs, 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 is 30% quicker than the GeForce GTX 650 overall, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce 8800 Ultra should 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

The GeForce GTX 650 should be a bit (more or less 15%) more effective at anti-aliasing than the GeForce 8800 Ultra, and capable of handling higher 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 maximum amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.