Radeon HD 3650 512MB vs Radeon R9 280X

Intro

Compare those specifications to the Radeon R9 280X, which uses a 28 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 memory works at a speed of 1500 MHz on this specific card. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB		78 Watts
Radeon R9 280X		250 Watts
	Difference: 172 Watts (221%)

Memory Bandwidth

Performance-wise, the Radeon R9 280X should theoretically be a lot superior to the Radeon HD 3650 512MB overall. (explain)

Radeon R9 280X		288000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 262400 (1025%)

Texel Rate

The Radeon R9 280X should be a lot (approximately 1776%) faster with regards to anisotropic filtering than the Radeon HD 3650 512MB. (explain)

Radeon R9 280X		108800 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 103000 (1776%)

Pixel Rate

The Radeon R9 280X will be quite a bit (about 838%) more effective at full screen anti-aliasing than the Radeon HD 3650 512MB, and also capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R9 280X		27200 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 24300 (838%)

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 (measured in MB per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once 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 anti-aliasing, 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 number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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