Radeon HD 3850 1GB vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which has a GPU core clock speed of 1050 MHz, and 8192 MB of GDDR5 memory running at 1500 MHz through a 512-bit bus. It also is made up of 2816 Stream Processors, 176 TAUs, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 1GB		75 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 200 Watts (267%)

Memory Bandwidth

Performance-wise, the Radeon R9 390X 8G should in theory be a lot better than the Radeon HD 3850 1GB in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 3850 1GB		52992 MB/sec
	Difference: 331008 (625%)

Texel Rate

The Radeon R9 390X 8G should be a lot (more or less 1629%) faster with regards to AF than the Radeon HD 3850 1GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 3850 1GB		10688 Mtexels/sec
	Difference: 174112 (1629%)

Pixel Rate

The Radeon R9 390X 8G should be a lot (about 529%) better at anti-aliasing than the Radeon HD 3850 1GB, and should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 3850 1GB		10688 Mpixels/sec
	Difference: 56512 (529%)

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 maximum amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the 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 most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.