Radeon HD 3650 512MB vs Radeon R9 M390X

Intro

Compare all of that to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also features 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB		78 Watts
Radeon R9 M390X		125 Watts
	Difference: 47 Watts (60%)

Memory Bandwidth

Performance-wise, the Radeon R9 M390X should theoretically be quite a bit better than the Radeon HD 3650 512MB overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 134400 (525%)

Texel Rate

The Radeon R9 M390X should be quite a bit (approximately 1496%) faster with regards to AF than the Radeon HD 3650 512MB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 86744 (1496%)

Pixel Rate

If using a high resolution is important to you, then the Radeon R9 M390X is a better choice, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 3650 512MB		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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.