GeForce GTS 450 1GB vs GeForce GTX 275

Intro

Compare all of that to the GeForce GTX 275, which comes with GPU clock speed of 633 MHz, and 896 MB of GDDR3 memory running at 1134 MHz through a 448-bit bus. It also features 240 SPUs, 80 Texture Address Units, and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB		106 Watts
GeForce GTX 275		219 Watts
	Difference: 113 Watts (107%)

Memory Bandwidth

In theory, the GeForce GTX 275 should be 120% faster than the GeForce GTS 450 1GB overall, due to its higher bandwidth. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 69280 (120%)

Texel Rate

The GeForce GTX 275 should be quite a bit (approximately 102%) better at AF than the GeForce GTS 450 1GB. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 25584 (102%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 275 is a better choice, by far. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 5196 (41%)

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 information (measured in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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