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E8400 Overclocking to 3.6Ghz - Page 3

post #21 of 31
i have the same ram and from experience, it dont take to kindly to speeds above what it's rated
post #22 of 31
Thread Starter 
Quote:
Originally Posted by Acoma_Andy View Post
What vcore does Cpu-Z read out when you put it to 1.3v in bios? Vcore was your problem, not the ram.

And please look up maximum safe voltage for your specific set of ram.
CPU-Z reads Core Voltage: 1.248. Core temp shows 53C at 100% and real temp 48C. How much can a temp go up to? i might do a 4ghz overclock
post #23 of 31
I've seen a few people suggest using over 1.4 volts for vCore. After some initial issues, most OC'ers seemed to come to a consensus that 1.365v was considered to be the maximum acceptable voltage for the 45nm CPUs. I'm just throwing that out there for you, so that you can take that into account.

Also take into account that even with that vCore limit, the E8400s usually don't need all that much voltage to get stable OCs. That said, mine needed 1.275 to run 3.6, so it's quite possible that you do need another bump of vCore - you just might want to lower the max limit you'll consider to 1.365v. It seems that with decent cooling, most people run into the voltage limit, before temps become an issue.

I've seen a lot of nice OCs at lower volts than mine can manage, but just for your refference, here is the overclock data for mine, including all voltages required for stability at the various clock speeds.

http://www.txsquadron.com/topic.asp?...&TOPIC_ID=2587

Or if you are only interested in 3.6GHz, in my case (C0 E8400) I set 400*9, vCore 1.275 (BIOS set) underclocked RAM 4-4-4-12 @ 800MHz DDR2 @ 2.1v CPU VTT: 1.30v, MCH1.25 @ 1.40V (uGuru shows 1.45). Tuniq @ 1740RPM CPU peak temp 48C (47 AVG) 35C idle. uGuru temps: CPU 43 System 26C, PWMs 41/42/43/41/39
SuperPi1M:12.750s
Edited by 8KCABrett - 12/28/08 at 8:02pm
post #24 of 31
CPU under full load is safe at ~63C. Most people tell you to never go over about 70C. 53C on air @3.6 is pretty good. MIGHT be able to hit 4 on air. Just watch your temps close, and you will definitely have to up your voltage a bit. I'd suggest running prime95 or Orthos on blend for AT LEAST a few hours before calling it stable and moving on
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post #25 of 31
Thread Starter 
I guess I can't oc to 4ghz because my RAM is only 800/2 = 400FBS max.
post #26 of 31
Im running 4.0 at 1.30 volts, shows up 1.29 in cpuz.
12hrs prime95 stable
I also have g.skill 800 its at 890 in bios running on 1:1. I think I have same mobo as you.
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post #27 of 31
You can also run unlinked as well. That way, you just set your ram at 800, then up your FSB to whatever you want. I personally run linked sync mode.
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post #28 of 31
Thread Starter 
I tried making my RAM 1066 with 2.1Volts, and 4ghz=9x444FBS with two increments above 1.3. System failed to load, and I had to reset CMOS. I guess afterall I will not be able to make it that high? Also my motherboard does not allow to set the RAM to 888. Which would make a 1:1 if I understand correctly
post #29 of 31
Not all E8400s are guaranteed to hit 4GHz stable at safe voltages (more true for recent batches). There are quite a few batches that are terrible OCers (requiring insane amounts of voltage beyond a certain point). Can you post your batch number? (It's on the sticker with an intel hologram on the retail box, bottom left as FPO#).
post #30 of 31
Quote:
Originally Posted by samfreese View Post
You can also run unlinked as well. That way, you just set your ram at 800, then up your FSB to whatever you want. I personally run linked sync mode.
You can't run unlinked on UD3P/UD3R. It has a number of FSBstraps and memory-latches to choose from.
The unlinked mode is the only part that I really miss on this mobo.
Edited by kimosabi - 12/27/08 at 2:23am
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