Radeon HD 3650 512MB vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which comes with clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2048 SPUs along with 128 Texture Address Units and 32 ROPs.

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

Theoretically speaking, the Radeon R9 M390X should be a lot faster 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 is quite a bit (about 1496%) more effective at 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 far. (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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.