Radeon HD 4650 512MB vs Radeon HD 6450 (OEM) 1GB

Intro

Compare all of that to the Radeon HD 6450 (OEM) 1GB, which features GPU clock speed of 750 MHz, and 1024 MB of GDDR5 memory set to run at 900 MHz through a 64-bit bus. It also is made up of 160 Stream Processors, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 24 Watts (77%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6450 (OEM) 1GB should theoretically be much superior to the Radeon HD 4650 512MB overall. (explain)

Radeon HD 6450 (OEM) 1GB		28800 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 12800 (80%)

Texel Rate

The Radeon HD 4650 512MB should be a lot (about 220%) more effective at AF than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 13200 (220%)

Pixel Rate

The Radeon HD 4650 512MB should be a lot (more or less 60%) better at anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and will be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 1800 (60%)

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 (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster 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 in one second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per 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 drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.