GeForce GTS 450 1GB vs GeForce GTX 650

Intro

Compare all of that to the GeForce GTX 650, which makes use of a 28 nm design. nVidia has clocked the core speed at 1058 MHz. The GDDR5 memory works at a speed of 1250 MHz on this model. It features 384 SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 42 Watts (66%)

Memory Bandwidth

In theory, the GeForce GTX 650 is 39% quicker than the GeForce GTS 450 1GB overall, due to its greater data rate. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 22272 (39%)

Texel Rate

The GeForce GTX 650 should be a lot (about 35%) better at anisotropic filtering than the GeForce GTS 450 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 8800 (35%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 650 is superior to the GeForce GTS 450 1GB, by a large margin. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 4400 (35%)

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 largest amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.