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Cant POST at 1600mhz anymore

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August 14, 2012 9:33:45 PM

Hello all,

Important specs:
Intel i5 2500k
2x2GB G.Skill Ripjaws X DDR3 1600mhz CL6
ASUS P8Z68-V

I have a strange problem... once again.
Last night everything in my pc was running fine. When I turned it on this morning, it would not post and the "DRAM-LED" was red. Turns out I can only post and boot with running 1333mhz. After testing a few things I have established this:

1. Any timings or voltages at 1600mhz will not post.
2. I can run my XMP voltages and timings at 1333mhz without problems.
3. The RAM is not faulty. (At 1333mhz CL6 I've tryed individual sticks, different slots, 4 passes of memtest, some prime95...)

I have reseated my RAM and CPU, I have played with X.M.P versus manual settings, VTT voltages, and I think my RAM isn't at fault here....

FYI: I had my CPU overclocked to 4ghz but now I brought back default clocks hoping to rule that out.

Whats strange is that its not "faulty" in the traditional sense, it either works or dosn't work....
Any ideas? Faulty mobo?

More about : post 1600mhz anymore

a b } Memory
August 14, 2012 9:39:57 PM

Are there any BIOS updates available from Asus?
August 14, 2012 10:39:50 PM

If it was working before. Might be worth a try to do a cmos/bios reset. (The hard one via the mobo jumper/button/battery or whatever.

But ya, second the idea to check for bios update.
Related resources
August 15, 2012 8:28:34 AM

No, I have the most recent bios. I reset the RTC + settings via a jumper but same problem.

Also, I told you that I brought my overclock back down to normal clocks? Well the turbo multiplier option is completely missing from the bios! (I noticed this before the RTC reset.)

I "updated" the bios to the same version, but I dont think it actually flashed, it just reset settings. I cant flash an older version because it wont let me.
a c 81 } Memory
August 15, 2012 10:38:14 AM

post your issues on the rog forum. they had a user that had your same issue. may be a bios issue or mb.
August 15, 2012 10:52:02 AM

Yeah I was looking around the asus forums but its impossible to search something there...
a c 347 } Memory
August 15, 2012 1:02:54 PM

My best assumption here, i.e. less than a guess, is that you degraded your CPU by using, being honest about it, foolish voltages. There are a few voltages that no doubt about it will permanently degrade a CPU. Otherwise hopefully you have a bad stick, try the Rated settings with (1) one stick.

Now for guesses, F3-12800CL6D-4GBTD with very high DRAM and VCCSA, and chances might include excessive VTT and/or PLL voltages. Heck perhaps a very high LLC with too high Phase controls sprinkle in a high vCore.

Q - What RAM kit?
Q - What were ALL of your OC BIOS settings? ; please list them all.
August 15, 2012 1:38:40 PM

jaquith said:
My best assumption here, i.e. less than a guess, is that you degraded your CPU by using, being honest about it, foolish voltages. There are a few voltages that no doubt about it will permanently degrade a CPU. Otherwise hopefully you have a bad stick, try the Rated settings with (1) one stick.

Now for guesses, F3-12800CL6D-4GBTD with very high DRAM and VCCSA, and chances might include excessive VTT and/or PLL voltages. Heck perhaps a very high LLC with too high Phase controls sprinkle in a high vCore.

Q - What RAM kit?
Q - What were ALL of your OC BIOS settings? ; please list them all.


Well thanks for bringing something new to the table but I doubt my OC of 4ghz at under 1.2v degraded my cpu in a matter of months... :-P Other than the CPU offset vcore I hadn't touched my RAM voltages. Left all the VTT and PLL stuff on auto... LLC was also only on 50%.

4ghz Overclock Info
LLC - High (50%)
VRM Spread Spectrum - Disabled
Phase Control - Standard
Duty Control - Extreme (Current balance as opposed to thermal balance)
CPU Current - 120%
Offset voltage -0.17volts, bringing us to around 1.15 under load 100% at around 50 degrees celcius.


My RAM kit is the 2x2GB G.skill Ripjaws X 1600 CL6, designation F3-12800CL6D-4GBXH. It only needs 1.5 volts, so the 1.65 SB problem is out of the picture.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
a b } Memory
August 15, 2012 1:48:27 PM

Actually, the DRAM sticks degrade over time. DDR's were known to degrade from 400 max mhz to 333 max mhz. In the DDR2 generation, a lot of sticks certified to run at 1066 (above 800mhz) eventually had to settle at 800 mhz. In the DDR3 generation, same thing happens. A lot of the low latency 1600 ram eventually becomes degraded enough to no longer operate correctly on ANY board with ANY CPU after about a year of use. A year of use seems to be what it took for DDR2 as well. Some memory silicon dies degraded quicker (Micron G-die), some slower (Samsung TCCD), some doesn't seem to (Winbond), all of those were DDR examples. DDR2's I stopped tracking who made the die.

What you can try is to manually set timings instead of the XMP profile. So that the timings all match with the XMP profile (check on the sticker on the RAM), then increase the ram voltage up one notch, from what it is now. However, if the ram voltage is already at 1.65Volts, you have no more room to increase voltage. Doing so will damage the memory controller (over prolonged use) at >1.65 Volts. You can also try to increase its CL one notch.
a c 347 } Memory
August 15, 2012 2:01:55 PM

Degrading a CPU can be done in a lot of different ways. I do not recommend an LLC -> High with a 4GHz OC, and it's not the OC it's the variety of Voltages. Example, I can set my vCore -> 1.60v and set the CPU to Stock or 3.5GHz; my CPU will become degraded in days. Frankly, for a 4GHz the LLC doesn't need to be touched and if you have instability adjust the Offset. Many 'guides' were dead wrong to encourage LLC changes for that low of an OC, and Duty Control use defaults e.g. T.Probe.

In the BIOS first Load Defaults (F5) now look at the VCCSA and perhaps the PLL, next AI Overclock Tuner -> XMP. Q - What are the VCCSA, DRAM and PLL Voltages?

/Edit - I find it rather disturbing 'why' the F3-12800CL6D-4GBXH were discontinued so quickly?! Many of the newer kits that have been discontinued set bad voltages. I recall a similar Patriot kit that set the VCCSA -> 1.35v which is (was) way too high and it was damaging CPUs.
August 15, 2012 3:41:14 PM

Aha, so you are saying either some part of my cpu (IMC?) degraded or my RAM degraded? Its only been 2 years with this ram, and 1 year with this 25k @4ghz.
Auto vs XMP vs manual voltages are all the same:
VCCIO (VTT) = 1.056
CPU PLL = 1.8
PCH = 1.081

What you both are saying makes sense, but if my memory degraded to the point where it couldn't run 1600mhz CL6 @ 1.5volts, it would be able to run 1600mhz CL9@1.5v right?
a c 347 } Memory
August 15, 2012 4:13:22 PM

I'd be willing to bet the issue is your CPU **IF all else is the EXACT SAME including BIOS versions. A clear indicator of a Degraded CPU is that the SAME voltages no longer work BUT HIGHER do correct the problem(s). My experience in a degraded RAM (VERY RARE) is if in the process of exceeding Rated you excessively increased the DRAM Voltage +0.30v or higher, RAM has a toleration of ±0.20v; not always on the -0.20v but certainly on the +0.20v.

Let's try the following:
F5
/Change Intel SATA -> RAID if you have RAID or leave it
AI Overclock Tuner -> XMP ; by itself it appears to fail so add the following:
VCCIO -> 1.20v ; max safe voltage
DRAM Voltage -> 1.60v ; +0.10v
F10 ; Save & Exit = Yes
August 15, 2012 4:31:05 PM

I tryed running XMP @ 1.6 volts with 1.2 volts for VCCIO in RAID mode, same problem.... how likely is it that I degraded the cpu, even with LLC? How can we rule out the motherboard? I dont have any other DDR3 sticks lying around, although I might be able to borrow some in a few days...
a c 347 } Memory
August 15, 2012 4:55:49 PM

Well first with settings that do work, I'd test the RAM with Memtest and see if any errors are cropping up first. Now IF you're getting errors then RMA the RAM; they're bad.

MOBO - IF you couldn't boot at all then maybe it's the MOBO.

A lot of things can affect the PC you name the component including 'clean power' from both the PSU and wall socket.

I assume you tried to Clear the CMOS (properly). Unplug the PSU for 5 minutes (drain all power for its capacitors), then using the Jumper method move the Jumper for 5 seconds or longer, place back; see video - http://www.youtube.com/watch?v=rdHH9KrceR0

Also, you might want to try re-seating the RAM a couple times then boot her up and try XMP again.
a b } Memory
August 15, 2012 5:17:23 PM

Like jaquith said, test your ram with Memtest, but if you have the opportunity, test the RAM/CPU on a different board (not both at the same time, one at a time) to see if the RAM is still at SPEC according to a different CPU/Board, and if the CPU is still at SPEC according to a different RAM/Board. This would isolate the component that is no longer able to operate at 1600mhz.

I know you said you increase the DRAM voltage, can you also dial back the timings a bit ? May have to do manual adjustments. RAM degradation is rare with modern high CL DDR3 (9 or up), but still common with low CL (<9) ram, because of the way they are binned.
August 15, 2012 5:21:37 PM

I've already reseated RAM, did a jumper reset and did several passes with Memtest.
Yeah my PSU isnt the best and could have knocked something out... :-0

I'll try clearing the CMOS "properly."
a b } Memory
August 15, 2012 5:24:23 PM

Max1s said:
I've already reseated RAM, did a jumper reset and did several passes with Memtest.
Yeah my PSU isnt the best and could have knocked something out... :-0

I'll try clearing the CMOS "properly."


What is your PSU ? Did you update BIOS lately ? If you are going to update BIOS, be sure to set the RAM at the settings that your computer was perfectly stable at (not 1600).
August 15, 2012 5:51:04 PM

I tried clearing the CMOS properly as well as runing 1600mhz CL9 @ 1.6v, still no POST.

My PSU is a two and a half year old CoolerMaster GX750w. I read reviews where a rail (I think it was the 3.3v) was fluctuating badly, and other reviews where they said it was a great PSU.

I updated my bios a month or two ago, but the error occured a few days ago. Remeber that I cant POST at all at 1600, just a black screen and the DRAM_MEM LED is lit, so I wont be doing any BIOS update running 1600.
a c 347 } Memory
August 15, 2012 6:50:33 PM

Couple BIOS tries, and all are safe:

BIOS2:

F5
/Change Intel SATA -> RAID if you have RAID or leave it
AI Overclock Tuner -> Manual
DRAM Timing Control /Enter
(enter) 11-11-11-30-2N ; those are as close to fail-safe as you can get

VCCIO -> 1.20v ; max safe voltage
DRAM Voltage -> 1.60v ; +0.10v

F10 ; Save & Exit = Yes

BIOS3:

F5
/Change Intel SATA -> RAID if you have RAID or leave it
AI Overclock Tuner -> Manual
DRAM Timing Control /Enter
(enter) 11-11-11-30-2N ; those are as close to fail-safe as you can get

VCCIO -> 1.20v ; max safe voltage
DRAM Voltage -> 1.60v ; +0.10v
CPU PLL Voltage -> 1.90v
F10 ; Save & Exit = Yes

DIMM Slots:

Normally use the Blue DIMM slots but just for, if nothing else, curiosity try the Black DIMM slots.
a c 347 } Memory
August 15, 2012 6:53:24 PM

Regarding power, yeah sure no doubts if there's oddball or dirty power being delivered then sure all sorts of oddball problems can occur.

I know you know DDR3-1600 CAS 6 is fringe at best, and a tiny nudge can make it all unstable.

I had a UPS that took a dump and I was ready to replace my monitor because it was only working IF I restarted the system, but was failing when the PC woke from hybrid sleep. Go figure.
August 15, 2012 7:38:09 PM

Tryed the different settings to no avail. Its like theres some brick wall at 1600mhz. No matter what timings, no matter what voltages.

Dont know what you refer to as a "UPS" But I also had a wakeup problem on this board that fixed through a bios update. Thats the only reason I dont completely hate ASUS boards, they keep releasing BIOS updates that actually fix things.

Thank you for your help, I guess my next step should be taking my RAM over to my friends house and trying it out over there, or vise virsa. (There aren't any other 1155 or DDR3 systems in this house, excluding a Mac. Makes troubleshooting sooo much harder...)
a c 347 } Memory
August 15, 2012 7:52:57 PM

My last post meaning was odd stuff happens...UPS (Uninterruptible Power Supply i.e. battery backup); I live in FL Lightning & Brownout capital of the US.

Yep the friends house is a good plan.
a b } Memory
August 15, 2012 8:27:43 PM

Max1s said:
Tryed the different settings to no avail. Its like theres some brick wall at 1600mhz. No matter what timings, no matter what voltages.

Dont know what you refer to as a "UPS" But I also had a wakeup problem on this board that fixed through a bios update. Thats the only reason I dont completely hate ASUS boards, they keep releasing BIOS updates that actually fix things.

Thank you for your help, I guess my next step should be taking my RAM over to my friends house and trying it out over there, or vise virsa. (There aren't any other 1155 or DDR3 systems in this house, excluding a Mac. Makes troubleshooting sooo much harder...)


Keep us posted on what happens with the swap try.
September 2, 2012 6:59:04 PM

If anyones still here, my friend FINALLY got around to testing my ram, (school just started and hes a lazy one) and he booted right up on XMP settings. Didnt do any prime runs, but he didnt have any problems, which compared to my black screen I would call "working fine."
So is it my cpu or mobo that it shot? Since the cpu multiplier option has disappeared from the bios, I'm starting to think my mobo is crapping out.
a b } Memory
September 2, 2012 7:01:42 PM

Max1s said:
If anyones still here, my friend FINALLY got around to testing my ram, (school just started and hes a lazy one) and he booted right up on XMP settings. Didnt do any prime runs, but he didnt have any problems, which compared to my black screen I would call "working fine."
So is it my cpu or mobo that it shot? Since the cpu multiplier option has disappeared from the bios, I'm starting to think my mobo is crapping out.


Could very well be the mobo then. Can you try your ram in your friends computer ?
September 2, 2012 7:26:50 PM

Yeah I gave him a stick of my RAM and he tested it in his computer, also 1155 z68 based.
September 2, 2012 7:27:18 PM

Max1s said:
Hello all,

Important specs:
Intel i5 2500k
2x2GB G.Skill Ripjaws X DDR3 1600mhz CL6
ASUS P8Z68-V

I have a strange problem... once again.
Last night everything in my pc was running fine. When I turned it on this morning, it would not post and the "DRAM-LED" was red. Turns out I can only post and boot with running 1333mhz. After testing a few things I have established this:

1. Any timings or voltages at 1600mhz will not post.
2. I can run my XMP voltages and timings at 1333mhz without problems.
3. The RAM is not faulty. (At 1333mhz CL6 I've tryed individual sticks, different slots, 4 passes of memtest, some prime95...)

I have reseated my RAM and CPU, I have played with X.M.P versus manual settings, VTT voltages, and I think my RAM isn't at fault here....

FYI: I had my CPU overclocked to 4ghz but now I brought back default clocks hoping to rule that out.

Whats strange is that its not "faulty" in the traditional sense, it either works or dosn't work....
Any ideas? Faulty mobo?



First of all, 2500k chip supports officially no more then 1333MHz. So there's no benefit of overclocking your Memory to 1600MHz unless you overclock your CPU.
May be You overclocked your CPU to 4GHz linked with memory could have gone more than 2000MHz.
Try using Memtest+(Bootable Recommended) for complete scan on RAM. If you use Linux, you should be familiar with it........
a b } Memory
September 2, 2012 7:29:09 PM

Max1s said:
Yeah I gave him a stick of my RAM and he tested it in his computer, also 1155 z68 based.


Whoops, I meant can you try your CPU on his board... I make a typo.
September 3, 2012 8:00:08 AM

n4v1n said:
First of all, 2500k chip supports officially no more then 1333MHz. So there's no benefit of overclocking your Memory to 1600MHz unless you overclock your CPU.
May be You overclocked your CPU to 4GHz linked with memory could have gone more than 2000MHz.
Try using Memtest+(Bootable Recommended) for complete scan on RAM. If you use Linux, you should be familiar with it........


I had my CPU overclocked to 4ghz, and I've already done 4 passes of Memtest86+ bootable.

Maxx_Power said:
Whoops, I meant can you try your CPU on his board... I make a typo.

Thats also a good idea, but I think it would be too much hassle. I think I'll just throw my RAM back in and just run it at 1333 CL6. The retailer's warranty on the mobo just ran out, so I'd have to ship it to ASUS in Taiwan or wherever, which I have done with a graphics card before; it take 3-4 weeks. I think Intel offers a 3 year warranty on their CPUs, but I've already overclocked this one....
a b } Memory
September 3, 2012 2:31:53 PM

Max1s said:
I had my CPU overclocked to 4ghz, and I've already done 4 passes of Memtest86+ bootable.


Thats also a good idea, but I think it would be too much hassle. I think I'll just throw my RAM back in and just run it at 1333 CL6. The retailer's warranty on the mobo just ran out, so I'd have to ship it to ASUS in Taiwan or wherever, which I have done with a graphics card before; it take 3-4 weeks. I think Intel offers a 3 year warranty on their CPUs, but I've already overclocked this one....


So long as you still have any warranty left on the board, it can be shipped to repair centers in the US or Canada. They (ASUS) do all services local.

I know you said it would be hassle some to test your CPU in your friends rig, but if you ever get the chance or urge to get to the bottom of this, it might be some time well spent.

September 3, 2012 3:21:50 PM

Maxx_Power said:
So long as you still have any warranty left on the board, it can be shipped to repair centers in the US or Canada. They (ASUS) do all services local.

I know you said it would be hassle some to test your CPU in your friends rig, but if you ever get the chance or urge to get to the bottom of this, it might be some time well spent.


Right, US or Canada, thats the problem. I live in Germany. I recently had a problem with an ASUS graphics card, and the retailer had to send it to "the manufacturer;" it was at least three weeks until I saw a new card.

I guess if I ran my CPU + RAM on my friends mobo and it worked I would know it was my mobo, and if it doesn't work I would know its my cpu, but I dont think I have the patience for this, at least not yet... Maybe when school gets going and I have less time on the computer... :-P
a b } Memory
September 3, 2012 6:48:16 PM

Max1s said:
Right, US or Canada, thats the problem. I live in Germany. I recently had a problem with an ASUS graphics card, and the retailer had to send it to "the manufacturer;" it was at least three weeks until I saw a new card.

I guess if I ran my CPU + RAM on my friends mobo and it worked I would know it was my mobo, and if it doesn't work I would know its my cpu, but I dont think I have the patience for this, at least not yet... Maybe when school gets going and I have less time on the computer... :-P


I hear ya. In fact it is just as bad here in North America for turn around times and service quality with ASUS. RMA times with ASUS is 2 weeks for a few things I have done in the last few years, and frequently, they returned non-functioning and banged up replacements.

Whenever you have the time, I know I'd be curious! :) 
September 3, 2012 6:52:25 PM

Yeah I guess I'll figure it out eventually. I've already had sooo many problems (alot of them a product of my curiosity) with this build I'm not in the tinker mood anymore.
!