GeForce GTX 275 vs GeForce GTX 465

Intro

Compare those specifications to the GeForce GTX 465, which features a GPU core clock speed of 607 MHz, and 1024 MB of GDDR5 RAM set to run at 802 MHz through a 256-bit bus. It also features 352 SPUs, 44 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

The GeForce GTX 275, in theory, should perform quite a bit faster than the GeForce GTX 465 overall. (explain)

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

Texel Rate

The GeForce GTX 275 should be much (about 90%) better at anisotropic filtering than the GeForce GTX 465. (explain)

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

Pixel Rate

The GeForce GTX 465 should be a small bit (about 10%) faster with regards to full screen anti-aliasing than the GeForce GTX 275, and should be able to handle higher resolutions without losing too much performance. (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 max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.