Radeon HD 3650 256MB vs Radeon HD 6450 (OEM) 1GB

Intro

Compare those specs to the Radeon HD 6450 (OEM) 1GB, which uses a 40 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM works at a speed of 900 MHz on this card. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 3650 256MB		78 Watts
	Difference: 47 Watts (152%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6450 (OEM) 1GB will be 13% quicker than the Radeon HD 3650 256MB overall, because of its higher data rate. (explain)

Radeon HD 6450 (OEM) 1GB		28800 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon HD 6450 (OEM) 1GB should be a little bit (about 3%) faster with regards to AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 200 (3%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, though only just barely. (explain)

Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 100 (3%)

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 data (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. 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 quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.