Radeon R9 390 8G vs Radeon R9 M265X

Intro

Compare all of that to the Radeon R9 M265X, which features GPU clock speed of 575 MHz, and 2048 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon R9 390 8G should theoretically be a lot faster than the Radeon R9 M265X in general. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon R9 M265X		72000 MB/sec
	Difference: 312000 (433%)

Texel Rate

The Radeon R9 390 8G will be a lot (about 596%) better at anisotropic filtering than the Radeon R9 M265X. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon R9 M265X		23000 Mtexels/sec
	Difference: 137000 (596%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 390 8G is superior to the Radeon R9 M265X, by far. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon R9 M265X		9200 Mpixels/sec
	Difference: 54800 (596%)

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 data (counted in MB per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling 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 that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.