Radeon HD 6670 (OEM) 1GB vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which has a clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 1024 SPUs, 64 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon HD 7850		130 Watts
	Difference: 67 Watts (106%)

Memory Bandwidth

In theory, the Radeon HD 7850 should be 140% quicker than the Radeon HD 6670 (OEM) 1GB overall, due to its greater data rate. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 89600 (140%)

Texel Rate

The Radeon HD 7850 will be a lot (more or less 187%) more effective at anisotropic filtering than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 35840 (187%)

Pixel Rate

The Radeon HD 7850 will be a lot (approximately 330%) better at full screen anti-aliasing than the Radeon HD 6670 (OEM) 1GB, and also able to handle higher screen resolutions better. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 21120 (330%)

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 data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.