Radeon HD 4830 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2560 SPUs as well as 160 TAUs 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

As far as performance goes, the Radeon R9 390 8G should in theory be much superior to the Radeon HD 4830 1GB in general. (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 quite a bit (more or less 770%) better at anisotropic filtering 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 screen 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: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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