Radeon HD 3650 vs Radeon HD 3870 1GB

Intro

Compare all of that to the Radeon HD 3870 1GB, which has a GPU core clock speed of 775 MHz, and 1024 MB of GDDR4 RAM running at 1125 MHz through a 256-bit bus. It also features 320(64x5) Stream Processors, 16 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 3870 1GB		106 Watts
	Difference: 28 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 1GB should be 181% quicker than the Radeon HD 3650 overall, because of its higher bandwidth. (explain)

Radeon HD 3870 1GB		72000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 46400 (181%)

Texel Rate

The Radeon HD 3870 1GB will be much (approximately 114%) better at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 3870 1GB		12400 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 6600 (114%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3870 1GB is superior to the Radeon HD 3650, by far. (explain)

Radeon HD 3870 1GB		12400 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 9500 (328%)

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 (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.