GF110 has 4 GPCs each capable of 8 pixels per clock. This limits complete GPU to 32 pixels per clock and because of that it can't feed all 48 ROPs when they all require data at the same time.
Each Streaming Multiprocessor(SM) in the chip architecture contains 8 SPs and 2 SFUs. Each SP can fulfill up to two single precision operations MAD per clock. Each SFU can fulfill up to four ...