GeForce GT 340 vs GeForce GTX 650

Intro

Compare those specifications to the GeForce GTX 650, which comes with a GPU core clock speed of 1058 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 128-bit bus. It also is made up of 384 SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
GeForce GT 340		69 Watts
	Difference: 5 Watts (8%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 650 should perform quite a bit faster than the GeForce GT 340 in general. (explain)

GeForce GTX 650		80000 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 25600 (47%)

Texel Rate

The GeForce GTX 650 is much (approximately 92%) better at AF than the GeForce GT 340. (explain)

GeForce GTX 650		33856 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 16256 (92%)

Pixel Rate

The GeForce GTX 650 should be a lot (about 285%) faster with regards to FSAA than the GeForce GT 340, and able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 650		16928 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 12528 (285%)

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 data (measured in megabytes per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record 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 clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.