GeForce 825M vs Radeon R9 390X 8G

Intro

Compare those specifications to the Radeon R9 390X 8G, which uses a 28 nm design. AMD has clocked the core speed at 1050 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this card. It features 2816 SPUs along with 176 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

Theoretically speaking, the Radeon R9 390X 8G is 2567% quicker than the GeForce 825M in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon R9 390X 8G is 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

The Radeon R9 390X 8G should be a lot (about 888%) better at anti-aliasing than the GeForce 825M, and also capable of handling higher screen resolutions while still performing well. (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: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. 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 texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.