Radeon HD 5750 1GB vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which makes use of a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5750 1GB		86 Watts
Radeon HD 5770		108 Watts
	Difference: 22 Watts (26%)

Memory Bandwidth

The Radeon HD 5770 should in theory be a bit faster than the Radeon HD 5750 1GB in general. (explain)

Radeon HD 5770		76800 MB/sec
Radeon HD 5750 1GB		73600 MB/sec
	Difference: 3200 (4%)

Texel Rate

The Radeon HD 5770 is a lot (approximately 35%) faster with regards to anisotropic filtering than the Radeon HD 5750 1GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 8800 (35%)

Pixel Rate

The Radeon HD 5770 is quite a bit (more or less 21%) more effective at anti-aliasing than the Radeon HD 5750 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 2400 (21%)

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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 reach the max fill rate.