Radeon HD 4850 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. 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 4850 1GB		110 Watts
Radeon R9 390 8G		275 Watts
	Difference: 165 Watts (150%)

Memory Bandwidth

The Radeon R9 390 8G should theoretically perform quite a bit faster than the Radeon HD 4850 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 320448 (504%)

Texel Rate

The Radeon R9 390 8G should be quite a bit (about 540%) better at anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4850 1GB		25000 Mtexels/sec
	Difference: 135000 (540%)

Pixel Rate

The Radeon R9 390 8G should be quite a bit (approximately 540%) better at AA than the Radeon HD 4850 1GB, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 4850 1GB		10000 Mpixels/sec
	Difference: 54000 (540%)

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 (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.