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Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion - Page 102

post #1011 of 1840
7/11/12 at 3:52pm
Quote:
Originally Posted by ti20n View Post

The official spec for these chips is 1.5v + 5% max, i.e. 1.575v; incidentally, that is also the max Vdram officially supported by Intel (IvyB). So I'm personally quite comfortable with that voltage (but I also bumped vccsa/vccio by 5% to match, which from what I understand is important).
That said, many retail forms of these chips (e.g. GSkill Trident X) run them at 1.65v, although granted that's with heatspreaders. But someone suggested earlier: ~1.60v without active cooling on the RAMs, ~1.65v with a fan pointed at them, should be safe.

Oh, okay. I thought the max specified was 1.5v. That's nice to know! thumb.gif
Quote:
Originally Posted by ericeod View Post

When running 4 or more modules, make sure to increase the tRFC. I noticed on the G.Skill 2600 ram using these ICs, the tRFC is like 209! I run tRFC of 148 when running 16Gb. Anyways, to give you an idea what timings G.Skill programs their Samsung 30nm chips to run at 2600, check out this link (courtesy of Da1Nonly):
http://www.xbitlabs.com/articles/memory/display/ivy-bridge-ddr3_6.html

Yeah, I know that other manufacturers just re-brand them, and some run at higher volts. What sort of setting should I be putting my set on, and what exactly does it do? smile.gif
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post #1012 of 1840
7/11/12 at 6:11pm
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There is a post burried deep in this longggg thread that explains the secondary timings for this kit. When I get a chance, I pull the info up and post for you.
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post #1013 of 1840
7/11/12 at 6:55pm
Quote:
Originally Posted by ericeod View Post

There is a post burried deep in this longggg thread that explains the secondary timings for this kit. When I get a chance, I pull the info up and post for you.

Thanks! I shall read aroud later on the Internet also and verify my findings here! smile.gif

+rep btw

EDIT: Aww no reps for you D:

EDIT2: This, is a really good guide. Although it's a tad outdated. I shall have to fiddle with some stuff tonight!

Also i didn't know that the tRAS was the CAS-tRCD-tRP combined. So technically when i can't boot at less than 24 it means that the timings on the overall ram should be 8 + 8 + 8 or something. At least i think that's what it means. It could just be outdated however.
Edited by Matt-Matt - 7/11/12 at 7:57pm
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post #1014 of 1840
7/12/12 at 7:57am
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Here is the link thaty explains the timings, and espeically the secondary timings for these modules:
http://www.techpowerup.com/reviews/Samsung/MV-3V4G3/6.html
Quote:
There are two timings that are linked together that will help greatly in overclocking. When these two timings are not set correctly, overclocking will not be as successful, and long-term stability can be hard to attain without excessive voltage. The above picture shows the primary and secondary timings we used to reach 2400 MHz with 1.575 V.

The two crucial timings, of course, are CAS Latency, and Write CAS Latency.

For CAS 6 and 7, tWCL should be CAS -1 (so CAS 6 gets tWCL 5 and CAS 7 gets tWCL 6)

For CAS 8 and 9, tWCL should be CAS -2 (so CAS 8 gets tWCL 6 and CAS 9 gets tWCL 7)

For CAS 10 and 11, tWCL should be CAS -3 (so CAS 10 gets tWCL 7, and CAS 11 gets tWCL 8)

I mention this as tWCL is not a timing that is talked about very often, if at all. However, because it has proven itself as a critical timing during testing, it is something that I felt must mention.
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post #1015 of 1840
7/12/12 at 12:40pm
I'll give this a try tonight when I get home from work...Sounds really interesting!
Thanks for sharing biggrin.gif
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post #1016 of 1840
7/12/12 at 8:12pm
Quote:
Originally Posted by ericeod View Post

Here is the link thaty explains the timings, and espeically the secondary timings for these modules:
http://www.techpowerup.com/reviews/Samsung/MV-3V4G3/6.html
Quote:
There are two timings that are linked together that will help greatly in overclocking. When these two timings are not set correctly, overclocking will not be as successful, and long-term stability can be hard to attain without excessive voltage. The above picture shows the primary and secondary timings we used to reach 2400 MHz with 1.575 V.

The two crucial timings, of course, are CAS Latency, and Write CAS Latency.

For CAS 6 and 7, tWCL should be CAS -1 (so CAS 6 gets tWCL 5 and CAS 7 gets tWCL 6)

For CAS 8 and 9, tWCL should be CAS -2 (so CAS 8 gets tWCL 6 and CAS 9 gets tWCL 7)

For CAS 10 and 11, tWCL should be CAS -3 (so CAS 10 gets tWCL 7, and CAS 11 gets tWCL 8)

I mention this as tWCL is not a timing that is talked about very often, if at all. However, because it has proven itself as a critical timing during testing, it is something that I felt must mention.

This seems really useful.. But

450

No option for it in my bios! redface.gif
Looks like unless i can figure out what it is off either values or another commonly used name i'm stuck!
What is it set to by default? Or does anyone know of an alternate name of tWCL? smile.gif

EDIT: I also just tried tRW level and it did nothing tongue.gif

EDIT2: In the screenshot off TPU, what's the program called? smile.gif
Edited by Matt-Matt - 7/12/12 at 8:18pm
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post #1017 of 1840
7/13/12 at 1:12am
Don't take my word for it, but I believe tWL = tCWL = tWCL depending on the BIOS
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post #1018 of 1840
7/13/12 at 1:18am
Quote:
Originally Posted by ti20n View Post

Don't take my word for it, but I believe tWL = tCWL = tWCL depending on the BIOS

Awesome, I'll take a look right now seeing as 1T is playing up all of a sudden..
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post #1019 of 1840
7/13/12 at 7:14am
Quote:
Originally Posted by ti20n View Post

Don't take my word for it, but I believe tWL = tCWL = tWCL depending on the BIOS

Write CAS latency (tCWL) and write latency (tWL) are related, but they are not the same timing.

tWL = tCWL + AL (additive latency)

Setting tWL to the figures mentioned in the techpower up article may result in instability. Additive latency is often 0, so this isn't always the case.

Personally, I can't get tWL of less than 8 to be stable regardless of what CAS latency I use at DDR3-1600+ on my Gulftown with two DIMMs per channel.
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32GiB Samsung MV-3V4G3D/US @ 1600, 8-8-8-24-T2,... Kingston V+100 96GB 4x WD Scorpio Black 500GB RAID 10 3x Hitachi 7k1000.C 1TB RAID 0 
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Noctua NH-D14 SE2011 + 2x NF-P14 + PK-1 (TIM) Windows Server 2008 R2 SP1 Enterprise Flico Majestouch Tenkeyless (MX Brown) Antec True Power New 750w 
CaseMouseAudio
Fractal Design Define R4 + 6 Cougar CF-V14HB CM Storm Spawn (firmware 61) Realtek ALC898 
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CPUMotherboardGraphicsGraphics
i7 970 3012B113 @ 4GHz, 1.264v, HT On Gigabyte GA-X58A-UD5 rev 2.0 Radeon 6870 1GB Radeon 5750 @ 918/300 (cryptography coprocessor) 
RAMHard DriveCoolingOS
6x4GiB Samsung MV-3V4G3 @ 1600, 8-8-8-24-T2, 1.4v 1TB Hitachi 7K1000.C, 2x250GB Seagate 7200.10s Prolimatech Genesis Windows Server 2008 R2 SP1 
MonitorMonitorPowerCase
ASUS 22" Acer 22" Enermax Modu82+ 625w Antec P182 
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CPUMotherboardGraphicsRAM
AMD FX-8150 @ 4.52GHz (210x21.5), 1.45v load GA-970A-UD3 rev 1.0 (F8a BIOS) Radeon 6950 @ 945/1425, 1.2v 4x8GiB G.Skill Ares @ 1680, 9-10-9-28-T2, 1.5v 
Hard DriveHard DriveCoolingOS
Samsung F3 1TB 2x Samsung F3 500GB RAID 0 Lapped TRUE + Panflo FBA12G12H1BX Windows 7 Professional x64 SP1 
MonitorPowerCase
Dell S2740L (27", 1920x1080, 7ms, IPS) Corsair TX650w Cooler Master HAF 932 
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post #1020 of 1840
7/13/12 at 7:23am
just ordered my 4 sticks of this! biggrin.gif


are there any guides to overclocking ram? I have never touched it before thumb.gif
Gaming Rig
(14 items)
  		  
CPUMotherboardGraphicsRAM
i5 2500k OC'd - 4.7ghz ASRock Z68 Extreme3 Gen3 GTX 680 SC+ Signature+ edition 8gb gskill dd3 1600 
Hard DriveCoolingOSCase
120gb intel SSD  kuhler 620 windows 7 ulti Cool Master HAF 912 
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Gaming Rig
(14 items)
  		  
CPUMotherboardGraphicsRAM
i5 2500k OC'd - 4.7ghz ASRock Z68 Extreme3 Gen3 GTX 680 SC+ Signature+ edition 8gb gskill dd3 1600 
Hard DriveCoolingOSCase
120gb intel SSD  kuhler 620 windows 7 ulti Cool Master HAF 912 
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Overclock.net › Forums › Intel › Intel Memory › Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion