Radeon HD 3650 256MB vs Radeon R9 270X

Intro

Compare those specifications to the Radeon R9 270X, which comes with a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1400 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is made up of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon R9 270X		180 Watts
	Difference: 102 Watts (131%)

Memory Bandwidth

The Radeon R9 270X, in theory, should perform a lot faster than the Radeon HD 3650 256MB in general. (explain)

Radeon R9 270X		179200 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 153600 (600%)

Texel Rate

The Radeon R9 270X is quite a bit (about 1279%) faster with regards to anisotropic filtering than the Radeon HD 3650 256MB. (explain)

Radeon R9 270X		80000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 74200 (1279%)

Pixel Rate

The Radeon R9 270X is a lot (about 1003%) faster with regards to anti-aliasing than the Radeon HD 3650 256MB, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 270X		32000 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 29100 (1003%)

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 max amount of data (counted in MB per second) that can be transported across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This figure 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.