Radeon HD 4770 vs Radeon HD 5670

Intro

Compare those specifications to the Radeon HD 5670, which uses a 40 nm design. ATi has clocked the core speed at 775 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this model. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Battlefield Bad Company 2

Settings:	High Quality
AA:	4x
AF:	8x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 4770		23 FPS
Radeon HD 5670		19 FPS
	Difference: 4 FPS (21%)

Left4Dead 2

Settings:	Very High
AA:	8x
AF:	16x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 4770		53 FPS
Radeon HD 5670		49 FPS
	Difference: 4 FPS (8%)

Mass Effect 2

Settings:	Maximum Quality
AA:	none
AF:	8x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 4770		61 FPS
Radeon HD 5670		57 FPS
	Difference: 4 FPS (7%)

Supreme Commander 2

Settings:	High
AA:	8x
AF:	16x
Resolution:	1920x1200
Test Machine:	Tom's Hardware Test Machine (Source)

Radeon HD 4770		48 FPS
Radeon HD 5670		37 FPS
	Difference: 11 FPS (30%)

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Radeon HD 4770 wins

(Based entirely on the benchmarks listed above)

When combining all game benchmark scores on this page together, the Radeon HD 4770 wins overall, by 23 FPS. Please note that we do not have the results of every benchmark ever done for these cards, so the results may differ wildly in different games.

Radeon HD 4770		185 FPS
Radeon HD 5670		162 FPS
	Difference: 23 FPS (14%)

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670		61 Watts
Radeon HD 4770		80 Watts
	Difference: 19 Watts (31%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5670 will be 25% quicker than the Radeon HD 4770 in general, due to its greater data rate. (explain)

Radeon HD 5670		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 4770 will be a lot (approximately 55%) better at anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 8500 (55%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4770 is superior to the Radeon HD 5670, and very much so. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 5800 (94%)

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 max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.