Radeon HD 6450 (OEM) vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which makes use of a 28 nm design. AMD has set the core speed at 723 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

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

Performance-wise, the Radeon R9 M390X should in theory be quite a bit better 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 much (about 1751%) faster with regards to anisotropic 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 screen 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 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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many 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.