I got a "better" motherboard and my computer is running slower than b4

[mistatwista]

Ok so here are my specs
ASUS P8Z68 DELUXE/GEN3 LGA 1155 Intel Z68 SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5"
Intel Core i5-2500K Sandy Bridge
Coolmaster Extreme at 600 watts
HIS HD 5870 Turbo

I had a GIGABYTE GA-Z68XP-UD3P LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard and I used to be able to max black ops @ 120 fps and mw2 @ 90 fps. Now in mw2 I cant get above 70 and in Black ops I cant get above 60. I looked into my BIOS and each stick is running at 800mhz and I was told you have to double it because its ddr so that means its really running at 1600 mhz my cpu is OC to 4.2ghz and my gpu clock is at 875 and memory clock is at 1225 for my graphics card. I don't know what's going on and I'm flipping out.

 

[mistatwista]

Nvm, I got a blue screen after I went into the bios and OC my cpu to 4.2 ghz so I but it back to default settings.

 

[Wamphryi]

I assume that you reinstalled your OS and drivers etc when you changed the board? If you didn't then this will be a big problem. A PC wont perform after a board change unless this is done.

 

[mistatwista]

Yes, I formatted my hard drive.