Check my overclock!

OrphanBoy

OrphanBoy

OrphanBoy

Associate
Joined
16 Jan 2005
Posts
641
Location
Laaaandan
This'll be my first proper overclock on my new machine - could someone check that I'm just doing it right and not doing anything stupid?

I've got an i5 750 2.66Ghz and an Asus P7P55D Pro with 4GB of G-skip Ripjaw 8-8-8-24-2T @1600MHz RAM.

I have the CPU clocked at 3.8GHZ (200*19) @ 1.272v, the IMC at 1.4v (which shows up as red in the BIOS), the PCIe link at 100MHz, and everything else on auto. The memory has been custom set on a 2:8 divider for 1600MHz at 8:8:8:24:2T @ 1.65v.

This is stable with Occt and IBT - however are these voltages legit for the longevity of the machine? Also I've got turbo and speedstep turned off - any hints here? During these tests the CPU sits at ~80 deg C.

Finally, I can get the machine to post at 4.0GHz but I can't make it the Windows desktop even at 1.3 ish volts. Anything else that I might wiggle to get myself there?

Cheers guys
 
I believe 1.4 is ok for lynnfield but as low as you can get the better. It seems like you have a decent chip getting to 3.8 at 1.27

4ghz is norm around 1.35-1.4v. 1.32v if your lucky with a good chip
What cooler do you have on the cpu as 80degrees seems very hot for the clock
 
Yeah heat is definitely an issue for this bad boy - I ordered a "Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler" however the ventilation in my case is pretty poor, I'm sure I could drop at least 5-10 deg C by removing the side panel! I'm tempted to break out my water cooling setup which is just sitting by my washing basket :)

At the moment I'm trying 3.6 (200*18) at 1.2v with the IMC at 1.3v and it's fine. I'm slightly disappointed that I can't make 4.0GHz, but clocking this thing is totally different to my 939 DFI!
 
Have a dabble with

Disable:
C1E
IEST
LLC

190*21 and try around 1.33v and play with the volts but personally i wouldnt clock until its under proper cooling
 
Cool, will look into this stuff. Just had a quick check around the net - yeah, seem this chip requires surprisingly low volts to get to 3.8GHz! This may be a better chip than I originally thought....however, there's no way I'm gonna notice a difference between 4.0 and 3.6GHz I think :)
 
OrphanBoy said:
there's no way I'm gonna notice a difference between 4.0 and 3.6GHz I think :)
Click to expand...

Which is why I stopped overclocking and arranged things so that EPU-6 dynamically overclocks only when overclocking is worth it.

So I'm mooching along the net at 1.4ghz. I open TF2 and it hits the settings for 3.6ghz. Minimise TF2 and clock down to 3.3ghz. Close TF2 and back to 1.4ghz.


/goes back to eating his cake ;)
 
sounds like you have a nice chip. Some of the chips will clock to 3.5ghz at stock voltage

might be worth a try to see if you can get that and itll reduce any wear on the cpu re voltage increase

I would get a better cooler still though if your hitting 80 on stressing the chip
 
I've just had another bash at this chip, with better cooling. I can get it almost stable with IBT at 4.0GHz with 1.35v and 0.1-0.2v extra on each of the other CPU-related voltages. I'm pretty happy with that! I think another 0.02v on the core would make this stable. I reckon I could get 4.2GHz with ~1.4v on the core.

I still don't think it's quite worth it though! An extra 20 deg C under load going from 3.6-4.0GHz and another 0.15-0.2v extra on the core for 10% extra speed? Nah :)
On the other hand, 1.2v seems about the right spot for 3.6GHz. A little lower and it's not stable.

Now I just need something to stress this machine ;)
 
I'm out of blank discs at the mo so can't check memtest (my old BIOS used to have it built in :() but having a bash with prime95 now. I've never used prime before - will I get some kind of messge if it fails?
 
Grab Intel Burn Test and run it on high,if it passes that ok I doubt it'll crash on you in anything else.
Prime is old hat these days and not worth messing about with,I've had chips that run for hours in prime and crash in games.
 
You must log in or register to reply here.
Back
Top Bottom