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Have noticed something a little strange when stressing clocks in memtest.

The following all report correctly in memtest after setting them in bios:

x 16.00 = 1600 Mhz
x 18.66 = 1866 Mhz
x 21.33 = 2133 Mhz

But if I clock to any of the following in bios the clock in memtest shows different?

x 18.00 = 2400 Mhz
x 20.00 = 2669 Mhz
x 22.00 = 2934 Mhz

Any reason for this?

Cheers

Update: Tried 2133Mhz @ 10-10-10-28 1T @ 1.55v and 1.1v VTT and memtest errored on Pass 3 around the 3 hour mark.

So slacken the timings or drop the Mhz?
 
Last edited:
Hi all,

I'm one of those nasty people that has been running 4 sticks of this (16GB) at stock.
Since that seems to be worse speed/timings than the Corsair Vengeance LP I have sitting around I thought I'd best try to do something with it.

So in the BIOS I set the RAM speed to 1866Mhz and set the timings to 9-9-9-27 1N (as they mentioned on the OcUK product page, I'm a noob at overclocking, especially memory) and left the Voltage on "Auto" (which unless it increases and decreases like CPU voltage would mean it's something like 1.356v).
I then ran SuperPI (1.8 Mod) on the 32M setting. It passed and took around 8m 11s.

Is that it? Is my RAM overclocked and SuperPI stable?
 
Buckster said:
more experimentation

2200 10-10-10-24 1T seems fine and stable @ 1.55V

CAS9 at 2200 at voltages (sub 1.57) that I am happy with seems a no go - as does 2400

so anything else I can tighten up on current settings please ?

2200-10.jpg


2200-10.png
Click to expand...

The thirds or tertiary timings are key for 2400+ Stable. Everyone seems to think its primary for stability. This is not at all the full picture. Thirds are key for stability and maintaining it as frequency goes up.
 
Just passed memtest @ 1866mhz 9-9-9-27 1T for 10+ hours, 10 passes.

Next I would like to try 2000mhz 9-10-10-28 but as I mentioned in an earlier post if I set bios to 2000mhz it reports it at 2669mhz in memtest.

Bit confused as to why?
 
Was beginning to think board (z77 sabertooth) was rubbish for clocking this ram, but turns out it's a single timing option that was causing ssytem not to post beyond 1866.

It's something called "additional swizzle". With it on auto/enabled, system just won't post.

What is it, and what do I lose disabling it?

Currently got ram at 2133 11-11-11-28-2t. Can't remember volts right now.

Probably not even going to bother trying to tighten things up or push for more, or lower volts.
 
CaNNoN_1981 said:
People tend to run it for 24 hours to be 100% sure, but I just run it for the duration I'm at work, 10-12 hours etc.
Click to expand...

Seems quite excessive really, I'd personally run it for less and then do some Prime95 Blend / LinX All Memory from within Windows.
 
CaNNoN_1981 said:
Just passed memtest @ 1866mhz 9-9-9-27 1T for 10+ hours, 10 passes.

Next I would like to try 2000mhz 9-10-10-28 but as I mentioned in an earlier post if I set bios to 2000mhz it reports it at 2669mhz in memtest.

Bit confused as to why?
Click to expand...

Mem test problem. Dont worry about that.
 
Rossi~ said:
It what sense?
You can't buy it in packs of 3 so your choices are:

- Buy 2x 8Gb kits and sell 1x4Gb = 12gb of RAM
- Buy 3x 8Gb kits = 24Gb of RAM
Click to expand...

because i thought it was quad channel and x58 is triple channel only?

i could do what you said with 12gb ram but keep the odd 1 stick for when i update motherboard.
 
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