5770 Size

Hello and welcome to the forums
It's about 8 inches
http://www.neoseeker.com/Articles/Hardware/Reviews/sapp...
"This mid-range HD 5770 video card is about the same length as a the high-end cards of 2 generations back (the 8800 GT or HD 3870), coming in at a length of about 8 inches, and has a double width cooler."

I would assume the older 5770s that are completely covered (http://i.neoseeker.com/neo_image/172641/article/sapphir...) are the same size as the newer partially covered ones (http://ecx.images-amazon.com/images/I/81PICPMyM7L._AA15...), then?

You could try to email them try this link http://www.sapphiretech.com/presentation/company/?cid=2... hope this helps