GeForce GT 340 vs GeForce GTS 150

Intro

Compare that to the GeForce GTS 150, which features a core clock speed of 740 MHz and a GDDR3 memory frequency of 500 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is made up of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
GeForce GTS 150		141 Watts
	Difference: 72 Watts (104%)

Memory Bandwidth

As far as performance goes, the GeForce GT 340 should theoretically be much better than the GeForce GTS 150 in general. (explain)

GeForce GT 340		54400 MB/sec
GeForce GTS 150		32000 MB/sec
	Difference: 22400 (70%)

Texel Rate

The GeForce GTS 150 will be quite a bit (more or less 169%) better at AF than the GeForce GT 340. (explain)

GeForce GTS 150		47360 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 29760 (169%)

Pixel Rate

The GeForce GTS 150 will be quite a bit (approximately 169%) more effective at AA than the GeForce GT 340, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTS 150		11840 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 7440 (169%)

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 information (measured in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units by the core clock 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 applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.