GeForce GT 340 vs GeForce GTX 275

Intro

Compare that to the GeForce GTX 275, which uses a 55 nm design. nVidia has set the core frequency at 633 MHz. The GDDR3 RAM works at a frequency of 1134 MHz on this card. It features 240 SPUs as well as 80 Texture Address Units and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce GTX 275		219 Watts
	Difference: 150 Watts (217%)

Memory Bandwidth

In theory, the GeForce GTX 275 will be 133% faster than the GeForce GT 340 overall, due to its greater data rate. (explain)

GeForce GTX 275		127008 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 72608 (133%)

Texel Rate

The GeForce GTX 275 is quite a bit (more or less 188%) better at AF than the GeForce GT 340. (explain)

GeForce GTX 275		50640 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 33040 (188%)

Pixel Rate

The GeForce GTX 275 should be much (about 303%) faster with regards to anti-aliasing than the GeForce GT 340, and also will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 275		17724 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 13324 (303%)

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 largest amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.