TechSpot

Processor and DRAM speeds help

By Ryan L
Jul 26, 2012
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  1. 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.
  2. slh28

    slh28 TechSpot Paladin Posts: 1,925   +170

    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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