GeForce GTX 650 vs Radeon HD 3650

Intro

Compare those specifications to the Radeon HD 3650, which has a core clock frequency of 725 MHz and a GDDR4 memory speed of 800 MHz. It also uses a 128-bit memory bus, and uses a 55 nm design. It is comprised of 120(24x5) SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 3650		78 Watts
	Difference: 14 Watts (22%)

Memory Bandwidth

The GeForce GTX 650 should theoretically perform a lot faster than the Radeon HD 3650 overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 54400 (213%)

Texel Rate

The GeForce GTX 650 will be much (more or less 484%) better at anisotropic filtering than the Radeon HD 3650. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 28056 (484%)

Pixel Rate

The GeForce GTX 650 is a lot (approximately 484%) more effective at AA than the Radeon HD 3650, and should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 14028 (484%)

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 (measured in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.