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Old October 28, 2010, 01:24 PM
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Default Advice for E8400 @ 4.05Mhz and RAM Settings

I need a little help getting my RAM to be stable with a 4.05Mhz overclock.


I built this rig over a year ago now and just recently purchased a OCZ Vendetta 2 cooler (Finally). I didn't want to be pushing up the temps with stock Intel cooler, so now is the time to start experimenting.


I went with an E8400 with the intentions to push it to 4.0Mhz. Reading so much about the overclock capabilities on this chip, I paired it with a Gigabyte EP45-UD3P.


Not knowing much about overclocking in the beginning, I have been trying to educate myself with all the information on this site and others. While at first a little confusing, most of the main concepts I think I got a handle on.


I have been able to get the E8400 to 4.05Mhz with 1.25v. Idle 37c, Load 60c. I'm not trying to break any records and I will be happy at 4.05. I just wanted to get some more value from this chip. I have been using OCCT as my stress test. I like the ability to be able to choose the small, med, large test and the time frame. I have been doing small 30min test just to be able to fine tune the voltage adjustments, then when it works, I up the time. 6Hrs OCCT Small is the longest so far.


So now on to the memory timings. Here is where I seem to be getting stumped. I have G Skill 8500 DDR2 1066 5-5-5-15 2GB x 4 for 8GB total. When I run at 4.05Mhz, I can put the ram to 1:1 @ 900 5-6-6-17 or 5:6 @ 1080 5-7-7-18. I have the Dram up to 2.1v. With the RAM at 1:1 @ 900 the OCCT medium test will get me about 15mins, then reboot. With the RAM at 5:6 @ 1080 the OCCT medium test usually just fails.


Here is the Question;


How can I overclock my RAM to be stable. It should be able to go much higher. And the mobo supports high speeds. What other adjustments need to be made in the BIOS. This is the part that still a little confusing. How do I get the RAM to play nice with the 4.05Mhz overclock.


Any advice would be greatly appreciated.


Thank You.


System


Intel E8400 @ 4.05Mhz 1.25v
Gigabyte EP45 UD3P
G Skill 8500 DDR2 1066 5-5-5-15
XFX HD 4850 XXX 650/1050 < 690/1190
OCZ Vendetta 2
Corsair TX 750
Antec 900
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Old October 28, 2010, 03:20 PM
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Location: New Westminster
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So you've adjusted the CPU Vcore, and the Dram voltage, have you adjusted any of the other voltages?


Did you turn off power saving features? C1E enhanced halt state, intel speedstep, etc

Maybe fix your PCIE frequency at 100Mhz

MIght have to set your CPU Termination voltage, and your MCH core voltage


I've had that board before, should have no problem running that ram at 900Mhz with 5-5-5-15, and prob tighter timings.
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Old October 28, 2010, 04:18 PM
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Thank you for the response.

I have not touched any other voltage.

Yes I did turn off C1E, No to SSE, etc. Only C1E. What others should be disabled?

PCIe is 100Mhz

Now those next two terms CPU Term Voltage and MCH core Voltage, I'm not sure what those do, so I haven't touched them. I did try the MCH from 1.1v to 1.2v, but I didn't notice anything. I take it that those values need to increase.? Would there be an issue with the full 4 sticks of RAM installed? Needs more juice?

With the RAM I've just been adjusting the memory multiplier, 2.00d, 2.66d. How else can I adjust the RAM in Bios?

I did little experimenting with my FSB. Instead of 450x9=4.05Mhz with rated FSB @ 1600Mhz. I tried 533x7.5=3.99Mhz with rated FSB @ 2132Mhz. The later allowed my RAM to run 1:1 5-6-6-17. I haven't tried the OCCT yet, but the question is, will 2132Mhz rated FSB too much for the board. Are there problems I may run into?

Thank you for the help...
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Old October 28, 2010, 04:59 PM
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MCH is the northbridge, as you run higher FSB and Mem, especially with 4 sticks of ram it'll have to be increased. try 1.3. How is your case cooling? The NB is just passively cooled so don't want to go too high on that.


Termination will need to be increased as you go higher FSB speeds. 1.2-1.3 should get you 450FSB easy.

when you have 2.0D, 2.0A whatever, it just changes the MCH frequency latch, I never really had any difficulty with any of them, I think I used to run 333Mhz or 400Mhz latch frequency though, then choose the ram frequency after.
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Old October 28, 2010, 10:47 PM
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Looks like I found some magic. Raising the MCH CORE was the trick. 1.2v seemed to do it.

Thank You
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4.05mhz , e8400 , ep45 ud3p , ram , timings

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