Radeon HD 4830 1GB vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which comes with GPU core speed of 1000 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is made up of 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Radeon R9 390 8G		275 Watts
	Difference: 180 Watts (189%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should perform a lot faster than the Radeon HD 4830 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 326400 (567%)

Texel Rate

The Radeon R9 390 8G is a lot (more or less 770%) more effective at AF than the Radeon HD 4830 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 141600 (770%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon HD 4830 1GB, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 54800 (596%)

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 data (in units of megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.