Radeon HD 4650 1GB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which features core speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs as well as 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 4650 1GB		55 Watts
Radeon R9 390 8G		275 Watts
	Difference: 220 Watts (400%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should perform a lot faster than the Radeon HD 4650 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 361600 (1614%)

Texel Rate

The Radeon R9 390 8G will be quite a bit (more or less 733%) more effective at anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 140800 (733%)

Pixel Rate

If using a high 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 4650 1GB		4800 Mpixels/sec
	Difference: 59200 (1233%)

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 information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, 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 figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at 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 the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.