Radeon HD 5750 512MB vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1500 MHz through a 128-bit bus. It also is made up 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)

Radeon HD 7790		85 Watts
Radeon HD 5750 512MB		86 Watts
	Difference: 1 Watts (1%)

Memory Bandwidth

Performance-wise, the Radeon HD 7790 should theoretically be quite a bit superior to the Radeon HD 5750 512MB overall. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 5750 512MB		73600 MB/sec
	Difference: 22400 (30%)

Texel Rate

The Radeon HD 7790 is quite a bit (more or less 122%) more effective at texture filtering than the Radeon HD 5750 512MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 5750 512MB		25200 Mtexels/sec
	Difference: 30800 (122%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7790 is a better choice, by far. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 5750 512MB		11200 Mpixels/sec
	Difference: 4800 (43%)

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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.