Radeon HD 3690/3830 vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which has core clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs as well as 176 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3690/3830		75 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 200 Watts (267%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390X 8G should theoretically be a lot superior to the Radeon HD 3690/3830 in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 3690/3830		26496 MB/sec
	Difference: 357504 (1349%)

Texel Rate

The Radeon R9 390X 8G will be quite a bit (about 1629%) faster with regards to texture filtering than the Radeon HD 3690/3830. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 3690/3830		10688 Mtexels/sec
	Difference: 174112 (1629%)

Pixel Rate

The Radeon R9 390X 8G should be much (approximately 529%) more effective at AA than the Radeon HD 3690/3830, and capable of handling higher resolutions better. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 3690/3830		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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.