32gb Corsair Vengeance Pro ddr3 2400ghz won't run at 2400ghz- What to do?

Toggle sidebar Toggle sidebar
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520
I can only get my 4 stick of 8gb memory to run at 2200mhz.
Yes I understand the difference is negligible but darned it if i'm spending more than $1,000.00
for a computer upgrade, I want perfection. If it says 2400mhz I want it to run at 2400mhz.

On the advise of Asrock I tested each stick individually and they all ran singly at
2400 mhz.

Then I tested them in 16gb Dual Channel and they also ran flawlessly at 2400mhz

But when I try to run 32gb, all 4 at 2400mhz OCT detects a CPU Error after 6 seconds.

I've tried everything with timings and voltages so let's not get into trouble shooting

I believe that there could be three causes
1. The Mother Board Simply won't do it.
2. The Modules which were bought as 2 16gb packs are slightly out of tune
3. The fault is with the memory compatibility with my motherboard.

So these are my options
1. Buy a 32gb set of the same ram. Since sold as 32gb set they are going to be less variations
in timings
2. Buy different Brand available to me is the PNY Anarchy 2400 or PNY Anarchy 2666
both sold in 16 gb packages made up of two 8gb modules

I'm limited in options because these are available at my local Frys and it's easy to return if I have issues.
Well not so easy, I have to travel 40 minutes each way to get to Frye's.

So which do you all think is the best choice.?

System Rig
Asrock Fatality Z97x Killer Motherboard
I-7 4790k CPU
Gigabyte Gamer1 GTX 980-TI Video Card
Corsair Veangance Pro Series DDR3 2400mhz
EVGA 1000 Watt Power Supply
 
Solution
Tradesman1
Looser timings are less of a stress on the MC, as it's running at the given data rate, but not performing as many operations as it's rated to do. Upping the MCs voltage a tad higher or the voltage of the DRAM itself, might give it the extra nudge needed to run to spec. Also keep in mind that each CPU of a single model is different, i.e. some OC great others not so much, the MC is the same, some are stronger than others. A good example on the 'strength' of a given CPU would be some testing Asus did with a bunch of 4770Ks, where they found a wide variance in OC ability of the various CPUs (all 4770Ks) tested.

http://www.tomshardware.com/reviews/dram-benchmark-fluctuations,4080.html
Sort by date Sort by votes
13thmonkey

13thmonkey

Titan
Jan 10, 2006
24,798
350
75,790
three things are needed for your memory to run at 2400.
the memory to be rated for it - Check
The mobo to cope with the OC - maybe maybe not
The Integrated memory controller to cope with the OC - maybe maybe not.

So the memory is fine, the other two components are not coping.
 
Upvote 0 Downvote
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520


Thanks your answer is eliminating one of my choices.

1. CMY16GX3M2A2400C11R Rated for 2400mhz
2. MOBO & Memory Contoller might not support 2400 but the manufacturer claims it will do it. and if it goes to 2200 stable then maybe issue with MB or Controller issues on timings on Ram.

So your answer makes me lean towards trying different brand with different Timings possibly my MB or Controller will like a different XMP profile.

 
Upvote 0 Downvote
Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
67,883
40
126,960
With two packages of DRAM may need a bit of an OC on the CPU (which is rated to 1600) to help the MC 9memory controller run a full load of 32GB), might also need a bit more voltage to the MC try adding + 0.05 or 6 to the VCCIO or DDRVTT voltage (maybe both)
 
Upvote 0 Downvote
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520


I'm running it on pretty much stock voltage. Although I fixed it at 1.30 which is on the high side.
Just isn't worth all the wear and tear to OC it and gain 5%, it's plenty fast for me at stock speed.

I did a firestrike and my score went from the 14800 to 15400 with an Oc.


It wouldn't work when I had it overclocked to 4.6 and 4.7 so don't think that's the solution.

MC try adding + 0.05 or 6 to the VCCIO or DDRVTT voltage (maybe both)
I will try that tonight.


 
Upvote 0 Downvote
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520
I ran in to a problem following your instructions.
VCCIO or DDRVITT settings weren't found in my Bios. Since I mostly use Linux I didn't want to use a
Windows Utility to try to make it work.

I went to Fry's returned the modules and bought two sets of PNY Anarchy Cl12 DDR3 2666 Modules [8X4]
the Corsair was CL11.

I installed them. I did one thing different this time. I made sure that each pair was matched on the same channel.
I don't know if that helped but it did remove a variable. My motherboard went into bios and immediately recognized and switched the XMP settings to 2666.
I rebooted and went into Windows.

Rock solid stable
Passed OCCT Small Medium and Large

Passed 5 minutes of Prime Large Blends and Medium Blends.

Also ran IntelBurn a linpack derivate on very high and it passed
interestingly enough it was around 2 seconds slower per minute then the other ram and
I was a little bummed.

Then I Ran PC Mark FireStrike
My previous score was 14800 my new score is 15,300 so I'm a happy camper.

I think that the problem is that my memory timing settings werent' compatible with the Motherboard
substituting ram running on different timings solved the problem.

Thank you all for your help.
 
Upvote 0 Downvote
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520


Does anyone else have experience about 16gb of ram working at Rated Overclock and then 32gb not working on the same settings.

Before choosing the answer above as solution , I'd sure like to hear some other opinions or experiences.

My interpretation of the final answer to my original question is that if you have a problem with 8X4 32gb Ram not running at the rated OC Frequency and module work fine in Dual Channel [2X8 16gb] easiest way to deal with the problem if minor tweaks don't work is to try different Ram with higher Latency [CL.]
 
Upvote 0 Downvote
W

WinnRig

Reputable
Aug 26, 2014
24
0
4,520
I'm still not sure.

I want to pick 13th Monkey because his comment on the timings makes sense.

I think Tradesman's link is awesome but it doesn't cover looser timings having
an effect on voltage or compatibility.So it doesn't cover 13th Monkeys explanation.

I can't' discount that my motherboard was more compatible with the PNY Anarchy 1666mhz Ram and automatically raised
the voltage settings which is why it worked making Tradesman right.

Anyone else have theory why the higher MHZ looser timing ram worked in 32gb mode.?
 
Upvote 0 Downvote
Tradesman1

Tradesman1

Legenda in Aeternum
Jun 5, 2013
67,883
40
126,960
Looser timings are less of a stress on the MC, as it's running at the given data rate, but not performing as many operations as it's rated to do. Upping the MCs voltage a tad higher or the voltage of the DRAM itself, might give it the extra nudge needed to run to spec. Also keep in mind that each CPU of a single model is different, i.e. some OC great others not so much, the MC is the same, some are stronger than others. A good example on the 'strength' of a given CPU would be some testing Asus did with a bunch of 4770Ks, where they found a wide variance in OC ability of the various CPUs (all 4770Ks) tested.

http://www.tomshardware.com/reviews/dram-benchmark-fluctuations,4080.html
 
Upvote 0 Downvote
Solution
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom