Radeon HD 4650 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which comes with a GPU core clock speed of 1000 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also is comprised of 2560 SPUs, 160 TAUs, and 64 ROPs.

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 is 1614% faster than the Radeon HD 4650 1GB in general, because of its higher bandwidth. (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 should be quite a bit (about 733%) better at texture 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

The Radeon R9 390 8G is a lot (approximately 1233%) better at full screen anti-aliasing than the Radeon HD 4650 1GB, and will be able to handle higher screen resolutions without losing too much performance. (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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.