Advice for E8400 @ 4.05Mhz and RAM settings

[BCBUD]

I need a little help getting my ram to be stable with a 4.05Ghz 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 4.0Ghz. 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 4.05Ghz with 1.25v. Idle 37c, Load 60c. I 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 4.05Ghz, 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 4.05Ghz overclock.

Any advice would be greatly appreciated.

Thank You.

System

Intel E8400 @ 4.05Ghz 1.25v
Gigabyte EP45 UD3P
G Skill 8500 DDR2 1066 5-5-5-15
XFX HD 4850 XXX 1GB 650/1050 < 690/1190
OCZ Vendetta 2
Corsair TX 750
Antec 900

 

[BigTerminator]

Well first off 4mhz is down clocking and I would think to be physically impossible to reach that speed. I like to go to 4ghz but I guess you are some weirdo How did you get so low I mean I can get under 1.5ghz but you got to 4mhz You don't really need a better cooler if you are down clocking so that was a waste All jokes aside I'm guessing you are trying the reach 4GHZ and you want faster memory well if you use all 4 sticks on any board, the overclocking abilities will be hindered. Even on p55 it would not overclock as high and X58 as well. But you really won't see much of any difference. I went from 1600mhz to 2300mhz on p55 which actually uses memory 100x better than p45 and x48 and didn't feel anything. So you going from 900mhz to 1000mhz won't make any difference in normal computing. Try to keep latencies as low as possible, in your case that will give you much better results.

 

[redduc900]

With 8GB of RAM installed (all 4 DIMM slots populated), bump the vNB (MCH Core Voltage) from the default of 1.1V to 1.3-1.35V. And at a FSB of 450MHz, adjust the MCH Latch to 400 w/ the System Memory Multiplier set to 2.00D = 900MHz DRAM freq.; 1:1 FSB : DRAM ratio, and the 4 primary DRAM timings set to 5-5-5-15 at 2.1V.

 

[BCBUD]

Whoops, 4.05Ghz, Rookie mistake. Yeah I only use my computer strictly as a Type Writer, Ha Ha

Thanks for the advice. Hey redduc900;

I took some advice from this thread http://www.overclockers.com/forums/showthread.php?t=635274.

I raised the MCH core to 1.2v, adjusted the RAM timings and System Memory Multiplier. Running 1080Mhz 5:6 @ 5-5-5-15 2.1v. I have been doing the OCCT 6hr Large, with no failure. It appears that I'm going in the right direction. You suggested the 400 x 2.00D = 900Mhz freq. Would that be a better sync of the FSB DRAM ratio?

Thanks

 

[redduc900]

As long as DDR2-1080 is stable then it's fine, otherwise if you're still looking for the max. clock then change the ratio from 5:6 to 1:1.