Radeon HD 4650 1GB vs Radeon R9 280

Intro

Compare those specs to the Radeon R9 280, which comes with core speeds of 933 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs along with 112 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 280		250 Watts
	Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 280 should be 971% faster than the Radeon HD 4650 1GB overall, due to its higher bandwidth. (explain)

Radeon R9 280		240000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 217600 (971%)

Texel Rate

The Radeon R9 280 should be a lot (more or less 444%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 85296 (444%)

Pixel Rate

The Radeon R9 280 should be quite a bit (more or less 522%) faster with regards to anti-aliasing than the Radeon HD 4650 1GB, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 25056 (522%)

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 max amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.