Radeon HD 6450 (OEM) vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with a core clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon R9 M390X		125 Watts
	Difference: 94 Watts (303%)

Memory Bandwidth

In theory, the Radeon R9 M390X should perform much faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 147200 (1150%)

Texel Rate

The Radeon R9 M390X is quite a bit (approximately 1751%) faster with regards to texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 87544 (1751%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M390X is the winner, and very much so. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 20636 (825%)

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 data (measured in MB per second) that can be transferred across 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 memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 applied per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.