Re:EVGA GTX 285 FTW Precision settings
Precision tool shows you i/o clock, which is 1323 Mhz.
DDR allows 2 data transfers per clock cycle, thus 2646 megatransfers per second.
A bit off topic but I think system DDR3 has i/o bus clocked at x4 of memory DRAM cell clock.
Say memory cell clock is 200 Mhz, i/o bus is at 800 Mhz and you get 1600 megatransfers per sec, thus DDR3-1600