Radeon HD 4770 vs Radeon HD 6670 (OEM)

Intro

Compare that to the Radeon HD 6670 (OEM), which comes with GPU clock speed of 800 MHz, and 512 MB of GDDR5 memory running at 1000 MHz through a 128-bit bus. It also features 480 Stream Processors, 24 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 4770		80 Watts
	Difference: 17 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6670 (OEM) will be 25% faster than the Radeon HD 4770 in general, because of its higher data rate. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 4770 will be much (approximately 25%) more effective at AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4770		24000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

The Radeon HD 4770 is a lot (approximately 88%) more effective at anti-aliasing than the Radeon HD 6670 (OEM), and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 5600 (88%)

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 information (counted in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends 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.