Radeon HD 5450 vs Radeon HD 7770

Intro

Compare those specifications to the Radeon HD 7770, which has GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 Stream Processors, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450		19 Watts
Radeon HD 7770		80 Watts
	Difference: 61 Watts (321%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7770 should in theory be much superior to the Radeon HD 5450 in general. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 5450		12800 MB/sec
	Difference: 59200 (463%)

Texel Rate

The Radeon HD 7770 should be quite a bit (approximately 669%) more effective at texture filtering than the Radeon HD 5450. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 5450		5200 Mtexels/sec
	Difference: 34800 (669%)

Pixel Rate

The Radeon HD 7770 will be quite a bit (more or less 515%) faster with regards to AA than the Radeon HD 5450, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7770		16000 Mpixels/sec
Radeon HD 5450		2600 Mpixels/sec
	Difference: 13400 (515%)

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 (in units of MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.