GeForce GT 340 1GB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which makes use of a 28 nm design. AMD has clocked the core frequency at 950 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this specific card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 7990		375 Watts
	Difference: 306 Watts (443%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should in theory be quite a bit better than the GeForce GT 340 1GB overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 521600 (959%)

Texel Rate

The Radeon HD 7990 is a lot (more or less 1282%) better at anisotropic filtering than the GeForce GT 340 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 225600 (1282%)

Pixel Rate

The Radeon HD 7990 is quite a bit (more or less 1282%) better at FSAA than the GeForce GT 340 1GB, and also able to handle higher resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 56400 (1282%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 number of texture map elements (texels) that are applied per 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's 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 get to the maximum fill rate.