Radeon HD 4650 512MB vs Radeon R9 390 8G

Intro

Compare all of that to the Radeon R9 390 8G, which features a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 RAM set to run at 1500 MHz through a 512-bit bus. It also is made up of 2560 SPUs, 160 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
Radeon R9 390 8G		275 Watts
	Difference: 220 Watts (400%)

Memory Bandwidth

The Radeon R9 390 8G should in theory perform quite a bit faster than the Radeon HD 4650 512MB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 368000 (2300%)

Texel Rate

The Radeon R9 390 8G should be quite a bit (about 733%) more effective at anisotropic filtering than the Radeon HD 4650 512MB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 140800 (733%)

Pixel Rate

The Radeon R9 390 8G is quite a bit (more or less 1233%) more effective at anti-aliasing than the Radeon HD 4650 512MB, and also should be able to handle higher screen resolutions better. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 4650 512MB		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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.