GeForce GTS 450 vs GeForce GTX 275

Intro

Compare those specs to the GeForce GTX 275, which comes with a clock speed of 633 MHz and a GDDR3 memory frequency of 1134 MHz. It also uses a 448-bit memory bus, and makes use of a 55 nm design. It features 240 SPUs, 80 TAUs, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 should be 120% faster than the GeForce GTS 450 overall, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 275 is a lot (approximately 102%) faster with regards to AF than the GeForce GTS 450. (explain)

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

Pixel Rate

The GeForce GTX 275 is quite a bit (more or less 41%) better at anti-aliasing than the GeForce GTS 450, and will be capable of handling higher screen resolutions better. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GTS 450		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 (counted in MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it must 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. 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.