The architecture of the HD 4670's GPU is similar to that of the HD 4850 and 4870, in that it is built using ATI's second generation 55nm process. Also similar is the high number of streaming processors, the 4670 has 320, which is 80 more than nVidia's flagship GTX 280. This should give us performance far beyond the price point of the HD 4670, as we have seen with the HD 4850.
For the past several months I have been dealing with mostly larger cards, 9" or longer, so the HD 4670 looks tiny, but at 6.5", it is the size of the last generation of midrange gaming cards. It should fit in pretty much any PC case.
The HD 4670 is clocked at the reference 750mHz, and the GDDR3 memory clocked at 2000mHz. 512 megs is a lot for a video card in this price range. Sapphire used Hynix memory for the HD 4670.
The card has a very low power draw, about 55 watts max. No additional power connector is required. This makes the HD 4670 a viable upgrade for "store bought" systems, those with PCI-E interface anyway. Those systems usually don't have extra power connectors, which makes installation simple.
Sapphire used a reference cooler on this card. The card really needs to take only one expansion slot space, so a larger cooler wouldn't make much sense.
Output is through a pair of DVI connectors and S-video. No S/PDIF connector is necessary for HD Audio via HDMI due to ATI's inclusion of an audio processor in the 4000 series GPUs.
Sapphire includes a nice bundle with the HD 4670, which really makes sense. The purchaser of one of these cards will likely not have a lot of extra stuff laying around left over from other builds, and this full bundle will be appreciated. The bundle includes: DVI/sub-15 adapter, DVI/HDMI adapter, S-video HDTV adapter, S-video/coaxial adapter, and a CrossFire bridge. Besides the driver disk, Cyberlink's PowerDVD and DVD Suite are included, and also AMD's Ruby ROM version 11.