Radeon HD 4670 1GB vs Radeon HD 6670 (OEM)

Intro

Compare all of that to the Radeon HD 6670 (OEM), which features a core clock speed of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 40 nm design. It features 480 SPUs, 24 TAUs, 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 4670 1GB		70 Watts
	Difference: 7 Watts (11%)

Memory Bandwidth

The Radeon HD 6670 (OEM) should in theory perform quite a bit faster than the Radeon HD 4670 1GB in general. (explain)

Radeon HD 6670 (OEM)		64000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 28800 (82%)

Texel Rate

The Radeon HD 4670 1GB is quite a bit (approximately 25%) faster with regards to AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

The Radeon HD 6670 (OEM) will be a small bit (approximately 7%) better at full screen anti-aliasing than the Radeon HD 4670 1GB, and able to handle higher resolutions better. (explain)

Radeon HD 6670 (OEM)		6400 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 400 (7%)

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 maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write 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 the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.