oooooh, here is a bit more.
"From AMD RV770 ppt info we got to know that Radeon HD4850 and Radeon HD4870 built in 800SP.
Radeon HD4850 is 625MHz, 800SP and each SP is 2FLOPS, 1000GFLOPS in total. Radeon HD4870 is 725MHz, 800SP and each one is 2FLOPS, 1200GFLOPS in all."
http://en.hardspell.com/doc/showcont.asp?news_id=3540

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