GeForce GTS 450 1GB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 21 Watts (25%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7790 should theoretically be much superior to the GeForce GTS 450 1GB in general. (explain)

Radeon HD 7790		96000 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 38272 (66%)

Texel Rate

The Radeon HD 7790 should be quite a bit (approximately 123%) more effective at texture filtering than the GeForce GTS 450 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 30944 (123%)

Pixel Rate

The Radeon HD 7790 will be a lot (more or less 28%) more effective at full screen anti-aliasing than the GeForce GTS 450 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 3472 (28%)

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 megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 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 clock speed of the chip. The better this number, the better the card will be at 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 video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.