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

Intro

Compare those specs to the Radeon R9 390 8G, which comes with 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

Theoretically speaking, the Radeon R9 390 8G will be 1233% quicker than the Radeon HD 6450 (OEM) 1GB in general, due to its higher bandwidth. (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 (approximately 2567%) faster with regards to texture 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

The Radeon R9 390 8G will be quite a bit (approximately 2033%) more effective at full screen anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and also should be able to handle higher resolutions better. (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 (counted in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, 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 the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends 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 maximum fill rate.