GeForce 9800 GTX+ vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce 9800 GTX+		145 Watts
	Difference: 60 Watts (71%)

Memory Bandwidth

Theoretically, the Radeon HD 7790 should be quite a bit faster than the GeForce 9800 GTX+ in general. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 25600 (36%)

Texel Rate

The Radeon HD 7790 will be a small bit (more or less 19%) better at texture filtering than the GeForce 9800 GTX+. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 8768 (19%)

Pixel Rate

The Radeon HD 7790 will be much (approximately 36%) faster with regards to AA than the GeForce 9800 GTX+, and should be capable of handling higher resolutions better. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 4192 (36%)

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 (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at 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 that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends 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.