Radeon HD 3650 512MB vs Radeon HD 6570 (OEM) 1GB

Intro

Compare those specs to the Radeon HD 6570 (OEM) 1GB, which comes with a clock frequency of 650 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6570 (OEM) 1GB		50 Watts
Radeon HD 3650 512MB		78 Watts
	Difference: 28 Watts (56%)

Memory Bandwidth

In theory, the Radeon HD 6570 (OEM) 1GB should be 13% quicker than the Radeon HD 3650 512MB in general, due to its greater data rate. (explain)

Radeon HD 6570 (OEM) 1GB		28800 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon HD 6570 (OEM) 1GB is quite a bit (about 169%) faster with regards to AF than the Radeon HD 3650 512MB. (explain)

Radeon HD 6570 (OEM) 1GB		15600 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 9800 (169%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6570 (OEM) 1GB is the winner, and very much so. (explain)

Radeon HD 6570 (OEM) 1GB		5200 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 2300 (79%)

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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This 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 in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.