Radeon HD 6450 (OEM) 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which features core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon R9 390 8G		275 Watts
	Difference: 244 Watts (787%)

Memory Bandwidth

The Radeon R9 390 8G should in theory be a lot faster than the Radeon HD 6450 (OEM) 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 355200 (1233%)

Texel Rate

The Radeon R9 390 8G should be quite a bit (more or less 2567%) more effective at anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 154000 (2567%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 390 8G is a better choice, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 61000 (2033%)

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 largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 maximum fill rate.