Radeon HD 4730 vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which comes with core speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs along with 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
Radeon HD 4730		140 Watts
	Difference: 55 Watts (65%)

Memory Bandwidth

The Radeon HD 7790 should in theory perform much faster than the Radeon HD 4730 overall. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 38400 (67%)

Texel Rate

The Radeon HD 7790 should be quite a bit (about 150%) faster with regards to anisotropic filtering than the Radeon HD 4730. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 33600 (150%)

Pixel Rate

The Radeon HD 7790 should be quite a bit (approximately 186%) faster with regards to anti-aliasing than the Radeon HD 4730, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 10400 (186%)

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 (counted in MB per second) that can be transferred past the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.