Do I need to change latency when adding more identical ram?

Toggle sidebar Toggle sidebar
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640
So I was using 8GB corsair vengeance ram
At stock it is 1600Mhz @ 9-9-924
I adjusted my latency to 7-8-8-24
I bought a extra 8GB of matching RAM but now my PC is getting errors
Could I need to change timings back to default or could this be actually bad ram that I should rma?
 
Sort by date Sort by votes
geofelt

geofelt

Titan
Oct 9, 2006
54,374
4,184
174,240
Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.

Sometimes you can increase the ram voltage in the bios and fix the problem.

Memtest86+ is the gold standard to test ram.
Test your new stick alone to see if it passes.
 
Upvote 0 Downvote
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640


can i run that from windows or do i need a bootable USB? because i have no spare usb
 
Upvote 0 Downvote
geofelt

geofelt

Titan
Oct 9, 2006
54,374
4,184
174,240

Memtest is stand alone.
You can boot from a USB stick, a CD drive, or, a (GASP!) floppy.

 
Upvote 0 Downvote
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640
I'm currently in memtest so I can't reply to comments from my phone.. But question..

People had this ram stable at 7-8-8-24, but I obviously didn't, I was getting 50 errors within 2 minutes, I've put the voltage and timings back to defaults, my test is on 58% and not a single error yet SO! Obviously it varies from system to system. So how come the manufacturers DEFAULT settings are stable across ALL systems (almost), but customised timings and voltages are only stable on SOME systems?
 
Upvote 0 Downvote
V

viewtyjoe

Reputable
Jul 28, 2014
1,132
0
5,960


The default settings are the ones that the manufacturer has tested to work across a variety of systems, and generally they're within the JEDEC standards which are a lot more conservative than what most memory can perform at easily.

That said, there's no guarantees that buying two identical DIMMs that aren't sold as a kit will actually work. Sometimes the motherboard just doesn't like the timings and you have to manually adjust things until you find one it likes.
 
Upvote 0 Downvote
geofelt

geofelt

Titan
Oct 9, 2006
54,374
4,184
174,240


You are looking good.
Normally if you pass a full cycle you are good.
Some will leave it running overnight, but I think that is not necessary.

I would not be too worried about timings or even speed.
The memory controllers on intel chips are very good at prefetching what the cpu will need.
Real app performance does not change much with speed.
Here is a report for haswell:
http://www.anandtech.com/show/7364/memory-scaling-on-haswell
 
Upvote 0 Downvote
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640


I'm actually using AMD haha.. But yes, it reached 1 full cycle, past 2/4??
 
Upvote 0 Downvote
geofelt

geofelt

Titan
Oct 9, 2006
54,374
4,184
174,240
AMD is more closely tied to the ram, and is impacted by ram speed.
I was just guessing intel.

If you want the best, buy a single matched kit.
Go to a ram vendor web site and access their configurator.
Enter your motherboard and you will get a list of supported kits.
A figure of merit is the speed divided by the cas number.
Higher is better.
 
Upvote 0 Downvote
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640


The only problem there is that on AMDs website it says the max speed across dual channel ram is 1600Mhz, that's why I upped my timings rather than speed.. The difference is so little anyway I might as well leave it at stock with 9-9-9-24 for the sake of no errors.. I do want Intel but it's gunna cost mw a new board, at least the 6600k to go with my gtx 1070 and more RAM which will be ddr4.. That total price is way too steep especially seem though all will need to be bought at once to even benefit
 
Upvote 0 Downvote
kyle2kxx

kyle2kxx

Reputable
May 7, 2016
80
0
4,640
I should also note that before making any of my current purchases I went to my motherboard's website and checked the list of supported memory and the memory i am using IS supported :) anyway, all seems to be good after putting things back to their defaults of which I think I will leave it at :)
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom