550 Ti OverClock Help Needed

Ok so i have the EVGA GTX Geforce 550 Ti (2GB) and it's slow I mean i thought this card could run all games on at least high. But, I ran  DayZ 33 Fps at times with Low everything & i record for Youtube so thats a problem with Fraps it gets to like 22 Fps which is literally unplayable! So i've overclocked it from 900Mhz - 1100Mhz & it's better and it's stable, also the memory is clocked from 2004Mhz - 2220Mhz all this using EVGA precision X. This is considered good from what I've seen on other places. My degress in Celcius is 38C Idle & 59C - 60C under Load, but my problem is it has a throttle back! it says in CPU-Z that its at the 1100Mhz & 2220Mhz mark. But when i put it under the EVGA OC scanner X (as well as in the Precision X) it throttles it back to 999Mhz & 2197Mhz! My system has 2 intake fans and 2 exhaust I don't know why it's clocking it down so hard if it hasn't even gone above 70C PLZ HELP (Also i got it to go 1050Mhz for awhile then it just downclocked once i reopened program the C was only like 38C it was idling at the time).

What's the CPU?