Processor and DRAM speeds help

Ok so I just built a pc recently here are the specs:

Windows 7 x64
ASUS SABERTOOTH Z77 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboar
Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I53570K
EVGA 015-P3-1480-KR GeForce GTX 480 (Fermi) 1536MB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power Supply
Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
NZXT Phantom PHAN-001RD Red Steel / Plastic Enthusiast ATX Full Tower Computer Case
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 15000) Desktop Memory Model CMZ8GX3M2A1866C9R
ASUS Black 12X BD-ROM 16X DVD-ROM 48X CD-ROM SATA Internal Blu-ray Drive Model BC-12B1ST/BLK/B/AS - OEM $

So I noticed the cpu was hitting around 75 degrees C under load with the turbo turned on running at 3.8 ghz. So I turned off the turbo and now according to CPU-z the cpu is running at 1.6 ghz even though the only things I did were turning off the turbo. Also according to my temperature utility the cpu is at 1 degree C, so not sure whats happening there. So how do I increase the speed? I notice the dram speed is only 1333 when its rated for 1866 so I manually set it to 1866. I was reading online about this FSB:DRAM ratio stuff and got extremely confused so any help would be appreciated. I bought Cool master evo 212 hyper and am waiting for it to come in by mail but I still want to figure this issue out in case it happens in the future.
 
What temperature utility are you using? Clearly 1C is wrong.

You need to check your CPU speed when it's under load, downclocking when idle is a power saving feature of all Intel and AMD CPUs.

When reading about the FSB to RAM ratio stuff make sure you ONLY read the Sandy Bridge/Ivy Bridge articles because previous Intel generations work differently. For your IB CPU the FSB speed is pretty much set to 100Mhz so you need a ratio of 18 to get to 1800Mhz on the RAM.
 
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