GeForce GT 340 vs Geforce GTX 670

Intro

Compare those specifications to the Geforce GTX 670, which features a clock frequency of 915 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1344 SPUs, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Geforce GTX 670		170 Watts
	Difference: 101 Watts (146%)

Memory Bandwidth

Theoretically, the Geforce GTX 670 should perform much faster than the GeForce GT 340 overall. (explain)

Geforce GTX 670		192000 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 137600 (253%)

Texel Rate

The Geforce GTX 670 should be quite a bit (more or less 482%) faster with regards to texture filtering than the GeForce GT 340. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 84880 (482%)

Pixel Rate

The Geforce GTX 670 will be a lot (about 565%) better at full screen anti-aliasing than the GeForce GT 340, and also will be able to handle higher resolutions while still performing well. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 24880 (565%)

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 maximum amount of data (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 amount of texture map elements (texels) that are processed in one 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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 max fill rate.