GeForce GT 340 1GB vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 7790		85 Watts
	Difference: 16 Watts (23%)

Memory Bandwidth

In theory, the Radeon HD 7790 should be 76% faster than the GeForce GT 340 1GB in general, because of its greater data rate. (explain)

Radeon HD 7790		96000 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 41600 (76%)

Texel Rate

The Radeon HD 7790 should be a lot (approximately 218%) better at AF than the GeForce GT 340 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 38400 (218%)

Pixel Rate

The Radeon HD 7790 will be a lot (approximately 264%) faster with regards to full screen anti-aliasing than the GeForce GT 340 1GB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 11600 (264%)

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 (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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