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Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion - Page 106

post #1051 of 1835
Is there any heatshield that is recommended to be used on these smaller dimms? Thanks!
post #1052 of 1835
Quote:
Originally Posted by anthonylokrn View Post

Is there any heatshield that is recommended to be used on these smaller dimms? Thanks!

You could always use thin strips of aluminium or something, they don't need heatspreaders though so you would only get them for aesthetic reasons.
Unless heat spreaders have come out since these sticks were released there probably aren't any available off the shelf.

Edit: Here's a thread in which a guy makes his own heatspreaders with strips of aluminium.
Edited by Mike-IRL - 7/20/12 at 1:28pm
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post #1053 of 1835
Newegg deal

SAMSUNG 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 $46.99 - 10% ($4.70) CODE: EMCNCHN45 = $42.29
post #1054 of 1835
Quote:
Originally Posted by ti20n View Post

If you go beyond 1.55v, afaik you have to start increasing vccio as well to keep a <0.5v gap between the two. At least that's what I read about sandyb. Maybe that's what cause your boot issues?
Also, getting past 2133 is highly dependent on your CPU and mobo. I personally can barely get 2200 at very relaxed timings, and 2400 simply won't boot regardless of timings.

This, I just raised the IMC to 1.045 at stock.. 'cause IBT gave me lower GLFOPS with the stock 0.925 IMC. I had to ramp up vccio and the IMC to 1.1v/1.095v respectively for 1866 @ 9-9-9-24 too. I could probably do 2000MHz with a bit more IMC but that would be going out of Intel spec which is probably a bad thing..
     
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post #1055 of 1835
FINALLY got my own pair of sammies, damn bills never cease.

anyways, I was able to attain clocks of 2133mhz @ 9-10-10-28-1T at 1.53v

http://valid.canardpc.com/show_oc.php?id=2454668

I am having an issue with my bclck in windows even though I maintain """"stability""""".

My Bclck is dropping anywhere between 66-100 randomly every 20-30 seconds.

heres a shot of this random occurance. Quite the annoyance as it results in short "lockups" and framedrops.

Any idea on the cause of this issue?


Edited by Xinoxide - 7/28/12 at 5:18pm
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post #1056 of 1835
Any one have any suggestions for Drive strength settings? I came up with this on my Asus Crosshair V w/1100T Just a pair of 4gb sticks @ 1.5V

DQS Drive Strength of X1.25

Data Drive Strength of x1.25

Mem Clock Drive Strength x1

ADDR/CMD x1.25

CS/ODT x1.5

CKE x1.5

This got me in the 970mhz range, stable at 943mhz


Look correct or did I miss somthing?

Thanks, Adam
post #1057 of 1835
What are you guys using to test your mem OC?

Looks stable at 2133 9-10-10-28 trfc is 147 [1t command rate]
1.525v

vtt and vccsa 1.15v

getting about 19.5ns memory latency in sisoft sandra, max bandwidth 54GB/s, only 2GB/ less than when I run mem at 2400Mhz with loose timings, but MUCH better latency

It's actually a much better kit than I initially thought, as long as you're not scared to pump volts. My 30nm retail box said 1.375v and 1.5v compatible so I imagine 1.525v should be safe
Edited by Scorpion667 - 7/29/12 at 11:08am
    
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post #1058 of 1835
I use memtest included in Hirens BootDisk ( handy collection of bootable freeware tools )
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post #1059 of 1835
After a lot more testing of these MV-3V4G3D/US sticks, I think there's a thermal expansion problem happening at >1.55v.

Many times, I've successfully run Prime 27.7 Blend w/ 6.4GB allocation for 8 - 30 hours at 2133 9-10-10-28-1T@1.57v. But for several of those times, the subsequent reboot + Prime rerun, would fail within 2 minutes. I managed to reproduce these weird "hot-cold-hot" failures a good dozen times for 2133 9-10-10-28-1T between 1.56v and 1.58v; but this has yet to occur for 10-10-10-28-1T @ 1.50v.

While my 4 case fans are only running at 60%, I would still say my HAF X is fairly well ventilated. I don't know how much PCB quality could cause these kinds of failures, but my recommendation now would be to stay below ~1.55v unless you have a fan seriously cooling the RAMs.
post #1060 of 1835
Quote:
Originally Posted by ti20n View Post

After a lot more testing of these MV-3V4G3D/US sticks, I think there's a thermal expansion problem happening at >1.55v.
Many times, I've successfully run Prime 27.7 Blend w/ 6.4GB allocation for 8 - 30 hours at 2133 9-10-10-28-1T@1.57v. But for several of those times, the subsequent reboot + Prime rerun, would fail within 2 minutes. I managed to reproduce these weird "hot-cold-hot" failures a good dozen times for 2133 9-10-10-28-1T between 1.56v and 1.58v; but this has yet to occur for 10-10-10-28-1T @ 1.50v.
While my 4 case fans are only running at 60%, I would still say my HAF X is fairly well ventilated. I don't know how much PCB quality could cause these kinds of failures, but my recommendation now would be to stay below ~1.55v unless you have a fan seriously cooling the RAMs.

It may just be unstable at 9-10-10. Have you tried 10-10-10 with the higher voltages and faced the same problems?
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