Question about the i5 and overclocking

Hey guys i have a question, i have a i5 2.66Ghz Overclock with "overclock genie" which is something that is out for MSI motherboards (if you dont know what it is, it is a 1sec overclock button.. just push the button and it overclocks your system).. it overclocked my CPU too 3.4 Ghz..

my question is when i play games like crysis, COD world at war, GTA IV, basicly high end games.. i get low frames or to what i think is low.. how many frames should i be getting is my question basicly

this is what i currently get

Crysis DIRECT 10(20-30 FPS) 1920X1080, NO AA OR AAA, EVERYTHING IS ON VERY HIGH WHICH IS ITS MAX
GTA IV (30-40 FPS) 1920X1080, EVERYTHING MAXED
COD World at war (50-60 FPS) 1920X1080. EVERYTHING MAXED
Assassins Creed (30-40 FPS) 1920x1080 everything maxed

those are just some games.. im not sure but is that normal or should i be getting more? and btw does frames are on good day when they feel like running good..

this is my set up with newegg links

CPU (i5 2.66GHZ)
http://www.newegg.com/Product/Prod [...] 6819115215

MOTHERBOARD (MSI P55-GD65)
http://www.newegg.com/Product/Prod [...] 6813130239

RAM (DDR3 200 G.SKILL TRIDENT 4GB)
http://www.newegg.com/Product/Prod [...] 6820231282

GRAPHICS CARD (XFX HD4890 XXX EDITION)
http://www.newegg.com/Product/Prod [...] 6814150368

MONITOR (ACER 23" )
http://www.newegg.com/Product/Prod [...] 6824009163

CPU COOLER (CORSAIR H50)
http://www.newegg.com/Product/Prod [...] 6835181009