Radeon HD 3650 vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which features GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon R9 M390X		125 Watts
	Difference: 47 Watts (60%)

Memory Bandwidth

In theory, the Radeon R9 M390X should be a lot faster than the Radeon HD 3650 in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 134400 (525%)

Texel Rate

The Radeon R9 M390X is much (more or less 1496%) faster with regards to texture filtering than the Radeon HD 3650. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 86744 (1496%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M390X is superior to the Radeon HD 3650, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 20236 (698%)

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 maximum amount of data (in units of MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 are applied in one second. This number is worked out by multiplying the total number of texture units 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.