Radeon HD 4650 1GB vs Radeon R9 280X

Intro

Compare those specifications to the Radeon R9 280X, which features clock speeds of 850 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R9 280X		250 Watts
	Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 280X should be 1186% quicker than the Radeon HD 4650 1GB in general, because of its higher bandwidth. (explain)

Radeon R9 280X		288000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 265600 (1186%)

Texel Rate

The Radeon R9 280X should be quite a bit (approximately 467%) better at texture filtering than the Radeon HD 4650 1GB. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 89600 (467%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 280X is a better choice, and very much so. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 22400 (467%)

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 (counted in megabytes per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.