Geforce GTX 780 vs Radeon HD 3650 256MB

Intro

Compare those specs to the Radeon HD 3650 256MB, which comes with a core clock frequency of 725 MHz and a DDR2 memory frequency of 800 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It features 120(24x5) SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Geforce GTX 780		250 Watts
	Difference: 172 Watts (221%)

Memory Bandwidth

The Geforce GTX 780, in theory, should perform much faster than the Radeon HD 3650 256MB overall. (explain)

Geforce GTX 780		288384 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 262784 (1027%)

Texel Rate

The Geforce GTX 780 will be a lot (approximately 2757%) more effective at anisotropic filtering than the Radeon HD 3650 256MB. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 159896 (2757%)

Pixel Rate

The Geforce GTX 780 will be much (more or less 1328%) faster with regards to anti-aliasing than the Radeon HD 3650 256MB, and will be able to handle higher resolutions without slowing down too much. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 38524 (1328%)

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 information (in units of MB per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the 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 amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.