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Rampage VI Hero / 4770K "gentleman's overclock" - Page 2

post #11 of 18
Quote:
Originally Posted by savage1987 View Post

Unfortunately, not only will 4.7GHz not play the game, I tested a previously 'stable' OC (4.6, 2400RAM) on a different stress test (AIDA64) and it hung the system up after an hour or so. This was a configuration that could pass hours on end of Prime95 blend. I'll play with the IMC-related voltages etc and hopefully smooth things out a little bit.

The only time Prime95 is useful is when you do a custom blend and have it use about 80-90% memory utilization. Otherwise it doesn't really stress the CPU very well. Intel Burn Test on Very High or LinX LinPack @ 80-90% Memory utilization can usually find an unstable overclock very quickly.

You might want to play with the BCLK because sometimes weird chips don't like certain multipliers being used. For instance my chip has no problem with 48x, 50, 51, 52 but for some reason doesn't like 49 multiplier.
post #12 of 18
Thread Starter 
Yeah I used it but checked the voltages manually wherever possible... they are indeed a bit high. Still comfortably in the safe zone at 4.6 though so I'm not worried about it.

AIDA64's FPU only test really turns the heat up on Haswell as it turns out. Same temps occur in Prime blend after 30min or so.
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post #13 of 18
Have a read through this if you haven't already.....

http://www.overclock.net/t/1411077/haswell-overclocking-thread-with-statistics/3900_30

124 from my experience is uncore, whether that be vrin/vring/SA/IOD. 101 vrin/vcore.

Drop ram to 1333, 1.65v & xmp disabled.

Lower uncore to x34@1.15v.

Set vrin to 1.9v, vcore to 1.25v.

Drop core multi down from x46 till stable.

Once stable raise core multi by 1. Stress. (should crash fairly quickly).

Raise vcore by .005v and stress again raising vrin by .025v each time you crash. 2.1v would be my cap on this. (i'm at 2.125v but for x50@1.35vid, 1.376v actual)

If still not stable by the time you hit 2.1vrin drop back down to 1.9v, raise vcore by .005v and repeat.

Doing it this way, from my experience, will net you a stable O/C at the lowest vcore and vrin possible for that multi. I use a different method for stressing as can be found in the Haswell O/C guide. You end up with indicators that let you know whats working and what isn't. Once you hit max core O/C (either temp or volt dependant) bring up the uncore (i use pretty much the same method but introduce SA/IOD) then finish with RAM.

If you want to be prime stable, i'd still run through the method i've been using as it'll get you close and just adjust vrin/vcore in small increments to get P95 stability. What do you use the rig for?

I guess everyone's got their own way of doing things, this worked for me so thought i'd share.thumb.gif
Edited by Doug2507 - 10/16/13 at 9:16am
post #14 of 18
Thread Starter 
Thanks for that, I wasn't aware of a 124/uncore connection. I'll try your method and see how it goes!!

This rig will primarily be a FSX build, hence the OC. The quicker the CPU, the better the FSX experience.
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post #15 of 18
Thread Starter 
Well I've given it some monstrous RAM voltage and I have a 4.6 / 4.3 Uncore / 2400MHz stable enough that I'm happy with it. It was failing any sort of large FFT testing really quickly, but 1.9V DRAM and +0.3 on the SA/IOA/IOD seems to have finally sorted that out. Apparently Haswell loves RAM being fed high voltages so I'm not concerned by how high I had to take it for stability.

Really it's not likely to ever be pushed this hard again in its life so if it handles whatever I can throw at it here, there should be no issues with FSX. (Hopefully!!)
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post #16 of 18
thumb.gif
post #17 of 18
Thread Starter 
Oh and I should give a special mention to Doug2507 for helping me out a hell of a lot with fault diagnosis/troubleshooting in a PM conversation. Don't blame him for the mega RAM voltages though, that was my own initiative smile.gif

Thanks Doug!
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post #18 of 18
Lol. No need dude, that's what forums are for!thumb.gif

In fact just noticed we're running the same RAM! Mega RAM voltages here we come!biggrin.gif
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