GeForce GTX 275 vs GeForce GTX 465

Intro

Compare all that to the GeForce GTX 465, which features a clock frequency of 607 MHz and a GDDR5 memory speed of 802 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 352 SPUs, 44 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
GeForce GTX 275		219 Watts
	Difference: 19 Watts (10%)

Memory Bandwidth

In theory, the GeForce GTX 275 will be 24% faster than the GeForce GTX 465 overall, because of its higher data rate. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 24416 (24%)

Texel Rate

The GeForce GTX 275 should be a lot (more or less 90%) better at texture filtering than the GeForce GTX 465. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 23932 (90%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX 465 is a better choice, though only just barely. (explain)

GeForce GTX 465		19424 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 1700 (10%)

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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.