GeForce 825M 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 RAM set to run at 1500 MHz through a 512-bit bus. It also is made up of 2816 Stream Processors, 176 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 242 Watts (733%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G should be 2567% faster than the GeForce 825M overall, due to its greater data rate. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 369600 (2567%)

Texel Rate

The Radeon R9 390X 8G will be much (about 1259%) faster with regards to texture filtering than the GeForce 825M. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 171200 (1259%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 390X 8G is the winner, and very much so. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 60400 (888%)

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 largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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