I have been experiencing a little bit of lag issues with my system...
Alright, I see people with the same specs as me playing crysis 2 maxed out with good frames... Also when I play Dayz it can drop down to below 30 fps :0.

My system specs are:

MOBO: ASRock Z68 Extreme3 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

PS: Diablotek UL Series PSUL775 775W ATX 12V v2.31 SLI Ready CrossFire Ready Power Supply

CPU: Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K

GPU: SAPPHIRE Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card (100314-3L )

Ram: Mushkin Enhanced Blackline 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model 996776

and windows 7 64 bit...

I have no OC's.. No coolers.. Everything is stock...
I also built this pc

Now, could anyone tell me an idea why this is running slower than others?
And if its because I need to OC?
I will plus rep.. Not much, but hey, Its something