Ivy On the way...Overclocking my PSC

Frozennova

Frozennova

Frozennova

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Hi 8 Pack,

Just took the plunge and bought my self an upgrade to Ivybridge (Gigabyte GA-Z68AP-D3 & 3570k (Q46 ES) I think I'm pretty sorted on the CPU overclock side of things but what is a reasonable target for my Mushkin Radioactive PSC Ram, its 1600mhz 6-8-6-24-1T for 24/7 use?
 
Yep its the beauty of psc, scale really well with volts and man are they rare! Think 8 pack has managed some silly clocks at tight timings with these on ln2.

I managed 2400 c8 quite easily with my kit, I tried for c7 but I'd likely have to dive deep into the subs to get it to post so didn't bother just yet.
 
£30 was money well spent then. Been waiting to stretch their legs since June when I bought them, managed a pretty darn good frequency on AM3 platform but knew they would really shine on Ivy/Haswel, didn't realise they we're this good though.

I should be aiming for around 1.21-1.25v for 4.5ghz on Ivy right, with Ultra-High to Extreme LLC right?
 
The Z68 is not as good for clocking RAM as Z77.

Pigi is correct for Z77 like 2400 8-12-8-28 or better ones 7-11-7-28 1T. I have actually done like 2700+ 7-10-7-18 on Z87 with LN2 and PSC or 6-10-6-18 at 2600+ with TRFC at around 64. PSC usually does not like TRAS less than 28 though these are good sticks.
 
So aim for 2400 8-12-8-28 to start with. I'd be happy with even 2133 but if I can get 2400 even better. Didn't realise Z68 didn't clock ram so well, I'd have preferred Z77 but the board and processor we're the right price at the right time.

What should I be aiming for on seconds/thirds or will leaving those on auto suffice to begin with?

What voltages need increasing for stability (First Intel system) and stability seems to rely heavily on TRFC?
 
I am not familiar with that boards seconds or thirds. i have Giga Z77 but not Z68 to test. Put me some screenshots up of the options and I can tell you what to tune though.

Auto first up.
 
Ivybridge has one on one uncore you cant change it like Haswell.

Are the auto settings there for 1600mhz? But basically they are ideal for 2400mhz second and thirds. TREFI needs to be 7936, CMD Rate can be 1T, otherwise ok yeah. If no post 2400 8-12-8 Go TWL 8 and tRRSR 5
 
Yea, auto settings are there for 1600mhz. In fact it appears they are there right upto 2200mhz.

Leaving everything on auto gives this, which is stable enough to run 32m

aq2tS6c.png

2400mhz doesnt post with your settings, I also tried with a little extra Ram voltage (1.7v) and 1.12v QPI/VTT.

Edit: Been doing some research and it looks like I might need to bump up the vccsa voltage slightly for 2400mhz?

Whats safe max for VTT/QPI as I get 0xD1 bsod when pushing 4.7ghz. 4.6ghz has been stable for the best part of the afternoon evening.
 
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I knew I'd be limited by Z68. I tried throwing some more volts in the mix this morning. 1.25 QPI/VTT, 1.25V SA and right upto 1.9v on the VDIMM. 1.86v gets me into windows but nothing upto 1.9v gives me any kind of stability.

A quick 8M run in SPI makes it to around loop 3 and no further.

I was being a bit of a puff with voltage, these modern cpus are a bit more fragile than the Phenom II I lm used to overclock in so didn't want to be killing things.
 
9-10-9 is fine around 1.74vdimm been running it since yesterday evening with no stability issues. All in not a bad result even if it's not quite what the ram would be capable of on a better chipset.

I'm happy with performance as it's a nice step up from my Phenom II and has been a cheap upgrade.

Thanks for your help 8 Pack
 
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