Overclocking Q8400 on DP45SG

Hey guys,
been reading over these forums for a couple weeks now pulling together pieces on how to oc my system. Current system specs from CPU-Z are:

Name Intel Core 2 Quad
Codename Yorkfield
Specification Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz
Package (platform ID) Socket 775 LGA (0x4)
Extended CPUID 6.17
Core Stepping R0
Technology 45 nm
Core Speed 2666.7 MHz
Multiplier x FSB 8.0 x 333.3 MHz
Rated Bus speed 1333.4 MHz
Stock frequency 2666 MHz
Northbridge Intel P45/P43 rev. A3
Southbridge Intel 82801JR (ICH10R) rev. 00
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR3
Memory Size 4096 MBytes
Channels Dual, (Symmetric)
Memory Frequency 666.7 MHz (1:2)
CAS# latency (CL) 9.0
RAS# to CAS# delay (tRCD) 9
RAS# Precharge (tRP) 9
Cycle Time (tRAS) 24
Row Refresh Cycle Time (tRFC) 74
Command Rate (CR) 2T
MCHBAR I/O Base address 0x0FED14000
MCHBAR I/O Size 4096

I have tried to increase the bus speed from 333.3 to 375 to get 3.0 ghz but i get a post error. Can anyone help? I tried messing with some one the voltages but that didnt fix anything. Im a bit lost here.

Thanks for your time!
6 answers Last reply
More about overclocking q8400 dp45sg
  1. Correct me if I am wrong, but since I have DD3-1333 memory I cant increase my FSB past 333.3? Is that the limiting factor in this build?
  2. Hi hammyboy21,

    You can check what I did to reach 3.0 GHz on my Q8400 here:

    I have my sights set higher but it's a start...:)

    "Correct me if I am wrong, but since I have DD3-1333 memory I cant increase my FSB past 333.3? Is that the limiting factor in this build?" -- simple answer: NO, it's not.
  3. thanks for the reply. I have read your post and had a couple questions. did you change the timing of your memory at all? So you increased your FSB to 375? The people on your thread seem to think you have DDR2 800 which is incorrect. According to the sticky, with DDR3 you divide by 4, so 1333/4=333.3. I'm a newb at this so any help would be appreciated.
  4. Hi hammy,

    Late reply but here goes:

    I did not change the memory timings. But I might go that way trying to push my cpu further.

    Yes, I increased the FSB to 375. And I actually do have DDR2 PC6400 (800 MHz) memory.

    When you increased your FSB, what memory ratio are you using? Did you up the Vcore some?
    Did you reach any further since your last post?

    And which motherboard do you have?
  5. I have an intel DP45SG motherboard. I am not sure how to change my memory ratio. Yes, I increased the Vcore, but i am having trouble getting it to boot. At 375, I cant even POST, but at like 350, it will POST but sit there and not load the OS. I have tried to read up about this a little more but find it very confusing :(
  6. hey so i have aprob similar. cept i gave up using the 8 x muliplier
    because for some reason my memory ratio was always 3:5 on 8 x multiplier no matter waht mem setting i tried 200, 333, 400 etc i couldnt get the mem ratio to 1:1

    so for me 8x 350 was about all i can do with a 3:5 ratio and ram is at 1066 well in my ram specs.

    i tried upping the vcore and still couldnt get past 3.3 to post..

    so then i tried lowering the multiplier to 7x 498 which gives me 3487 mhz
    with a fsb of 1983 my mobo max is 2000 fsb...

    and this settting has allowed me to run stable at 3.4 ghz
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