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Bad memory or bad motherboard? Memtest errors at XMP 2133 but none at 1333

post #1 of 6
Thread Starter 
Specs:

Windows 7 64 bit
ASRock Z77 Extreme6
Intel i5 3570k
EVGA GTX 660 Ti
OCZ Agility 2 60GB (Soon to be a 256GB Samsung 840 Pro)
Cooler Master Silent Pro Hybrid

So I just upgraded from some Team 2x4GB 1600 to some G skill 2x8GB 2133. I had been running the Team at its XMP 1600 for about 9 months until I started experiencing Windows Explorer crashes and BSODs. I ran memtest while it was still at 1600 with no errors. After the last BSOD the computer refused to post or show any signs of power such as lights, fans, or sound. However, there was a blip of static when you pressed the power button. I assumed it had something to do with the power supply. I bought a power supply tester from newegg and tested it. Everything checked out. I reconnected all the power and miraculously it worked. Now, about 2 months later, I put in this 2133, and set it to the xmp 1 profile at 2133 9-11-11-3x @ 1.6v . A 2nd profile showed up in the bios as well but it had the exact same timings and voltage as the 1st. After posting with the ram set at 2133 I ran memtest. It got to 5%, got 80 errors, and then froze. After I reset the computer it failed to boot 3-5 times and then came up with a screen saying it failed to boot a few times and to press f2 or del to enter setup. I entered setup and tried to set the memory back to 1333 and it froze before I could. It then reset first try and I tried the second profile. Same thing happened. I set the memory back to 1333, ran memtest with 0 errors, and it's running fine. It even seems snappier than the Team was.

Could the voltage be too low?

Is the memory just bad?

Could my motherboard just be unable to handle the load? it says you're supposed to be able to clock it up to 2800+

Any help is greatly appreciated.

Thanks,
Zach
post #2 of 6
So many variables, it's hard to tell exactly what's not working up to spec. The first thing I would do is make sure you have NO processor overclock settings, and then test ONE DIMM at a time with the XMP profile and see if it passes.

Your board may be certified to run with RAM at 2133, but your Intel i5 is not. Max RAM speed on the 3570K is DDR3-1600, anything higher and you're on your own. Could be the IMC in your 3570K doesn't want to go that fast, it certainly wouldn't be the first time somebody got stuck with a IB CPU that was clock speed limited on RAM.

If your old RAM passes Memtest86 at DDR3-1600 with flying colors, and the new RAM doesn't at the same clock and timings, then the new RAM is probably faulty.

Greg
post #3 of 6
Quote:
Originally Posted by hammong View Post

Your board may be certified to run with RAM at 2133, but your Intel i5 is not. Max RAM speed on the 3570K is DDR3-1600, anything higher and you're on your own. Could be the IMC in your 3570K doesn't want to go that fast, it certainly wouldn't be the first time somebody got stuck with a IB CPU that was clock speed limited on RAM.
If your old RAM passes Memtest86 at DDR3-1600 with flying colors, and the new RAM doesn't at the same clock and timings, then the new RAM is probably faulty.
Greg

Exactly this, note that greg said " at the same clock and timings" for the test, thats quite important to note: Your cpu probly can run it to the specified settings in the XMP profile, remember that the latencies and frequency the RAM manufacturers show is is "max tested settings" and not "will work at this on any CPU", you would need to do said test Greg proposed, if it passes then just start incrementing the speed untill you are forced to play with timings.
post #4 of 6
Thread Starter 
Thanks for the quick replies guys. So I tested the new sticks at 1600 with the same timings as the old ones and got no errors. What is an IMC? How do I know if that's the limiting factor?
post #5 of 6
Internal Memory Controller. It's the part of the CPU that "control's" the memory as it's name suggest. There is a voltage adjustment to that controller, boosting it the same way as you would vcore to get more stability could help, but only to a certain extent ( I believe this would be called VTT voltage on your board). How you know if it's the limiting factor: By checking if the RAM is good with the test you previously did, I think it's pretty safe to say the memory controller can't handle either that frequency or the timings it's at: start raising the frequency untill you get crashes; then adjust timing accordingly.
post #6 of 6
The memory probably wants you to run the voltage at 1.65v (if you look closely G.Skill actually states anywhere between 1.6-1.65v) and probably also need to increase VVT 1.116v. That should do the trick.

I severely doubt anything that has stated previously in this thread is in any way shape accurate.

The memory controller is fine. Play with the DRAM voltage and VVT.

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