GeForce GTS 450 1GB vs GeForce GTX 275

Intro

Compare those specs to the GeForce GTX 275, which makes use of a 55 nm design. nVidia has set the core frequency at 633 MHz. The GDDR3 RAM works at a speed of 1134 MHz on this specific model. It features 240 SPUs along with 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

The GeForce GTX 275 should in theory perform much faster than the GeForce GTS 450 1GB in general. (explain)

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

Texel Rate

The GeForce GTX 275 is quite a bit (more or less 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

The GeForce GTX 275 is a lot (more or less 41%) faster with regards to full screen anti-aliasing than the GeForce GTS 450 1GB, and also will be capable of handling higher resolutions while still performing well. (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 data (measured in MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 are processed per second. This is calculated by multiplying the total number of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.