I didn't read anything about spikes on the link you gave tictac! :)Quote:
Originally Posted by tictac
Printable View
I didn't read anything about spikes on the link you gave tictac! :)Quote:
Originally Posted by tictac
I think he was referring to
A post made by RGone at the top of page 6
http://www.xtremesystems.org/forums/...4&page=7&pp=25
Quote:
Now I have not seen this but have a tester that has had recording Oscope on the Vdimm and has not seen a spike as of yet. No he has not tested 15 motherboards but he still has seen no voltage spike.
The link tictac gave was what I found on how Vdimm was managed, especially on a AC power removed startup. In my testing I also did not see a Vdimm surge (albeit with a multimeter which is not good at detecting spikes) above the setting I had in CMOS.
The board may be the reason my Patriot died, though it has tccd and I never used the 5v jumper. Got them back from rma and don't think I'll use them in the board.
http://home.comcast.net/~kindnuguz/SMP.jpg
thats the VX thats got problems now.
Got the VX in Feb. and just got the Gold few weeks ago.
Peace Nugz
sorry... i'm trying to refer to this postQuote:
Originally Posted by hipro5
any spikes on your test? :hehe:Quote:
(3) Measurement at power on: Does not overshoot 3.6V
Well, I was using a multimeter - not the best equipment to see spikes with.
However, with the multimeter, the voltage did not exceed that which I had set it to in the CMOS. So, the answer is no, I did not see a voltage overshoot.
temp lack of CPU, we'll test propably next week :(Quote:
Originally Posted by tictac
Hi, Just bought a 3000+ and a DFI-ULTRA D.
Now I got a 20pin psu from lcpower (550W) and 2*256MB BH5.
Can I use the 5V jumper to put 3.5V on my ram and is it safe and what ram slots do you guys suggest because this topic scares the f*ck out of me :stick: ?
How do I attach the 20pin to a 24pin mobo (anyone got a pic)
Hi, do yourself a favor and get a 24 pin PSU. I have had customers damage components trying to use the 5v jumper with a 20 pin. This board uses all 24 pins and is not like the other boards on the market.Quote:
Originally Posted by 187(V)URD@
You will need a good quality 24 pin PSU of at least 480w.
Quote:
Originally Posted by andyOCZ
Naaaa OCZ only trying to sell more psu´s with 24 pin trick :D "Joke" . My Antec 550 w work with 20 to 24 pin modd and +3.3v @3.74v+ and 3.6vdimm+(no use of +5 line to vdimm). but its not recomended :D. but anyway try to not use +5 line to vdimm. Without risk to kill something its not fun :D
Haha, we don't make a 480w PSU. If I said 520w or 600w, then I might be trying to sell ours. The key is 24 pins to feed the board and using a GOOD QUALITY PSU, 'cause most are junk.Quote:
Originally Posted by Lastviking
I have to agree, as I have verified OzSnoal's testing. No spike's seen on my Fluke DMM. It's pretty darn quick, so I would have seen it.Quote:
Originally Posted by OzSnoal
Andy, why the 480W minimum requirment? Don't you think it is a little over the top? I mean are you saying that OCZ Powerstream 420 is not recomended with this board? Thanks.
I just checked with enginnering and the SPD is definately not the problem. They grabbed 10 dead VX kits and all had intact SPD info. I know you all want to blame the memory, but that isn't the problem. Keep looking. :)Quote:
Originally Posted by Nugz
Quote:
Originally Posted by hovo73
Hi, the 420w Powerstream works fine for non-SLI 6800 rigs. I say 480w beacuse that's what DFI recommends. Remember our Powerstreams are server class and are MUCH beefier than the typical PSU of the same watt rating. Many 500w models are more like a bad 350w unit. If they weigh nothing,they are nothing. Hehe
IMO that bogus 480W rating is just DFI trying to cover their ass from folks that buy $25 600w power supplies with 18A on the 12v rail.
I have the PS420, and it's more than enough to cover my board, and the menial current draw I am asking it to supply.
1 hdd (pata)
1 dvd
1 vcard(X800l)
1 stock hsf
1 3000+
No extraneous fans or lights.....
Way more than enough power for the DFI board no matter what they say...
If it ain't enough then there is a serious flaw in the chipset, and/or manufacturers board/implementation.
BTW OzSnoal did you happen to check if there was voltage on the pci or PCI-E slots when shutoff as well?
thx
m
Most - if not all - of the DMM out there, uses the ICL7107 IC for showing the Volts......This IC it is been builted by the manufacturer in a way to measure 3 times per second the Voltages........A spike could be only some mS and the DMM just can not read it.....An osciloscope would be a better idea in this case..... ;) :)Quote:
Originally Posted by andyOCZ
I agreeQuote:
Originally Posted by hipro5
DMM are way to slow to try and catch a spike that quick....
You have to be lucky to catch it.
hmm now that this discussion is going on (cold boot, etc.).. on every cold boot (yes its consistent now) i have noticed for me, with the ac plugged in for 12+ hours, but PSU switch is off, power up, signal to monitor, it POSTS, then black screen and hangs. power off (immediate power off, it doesnt need a pause for 4 seconds), then power back up, POSTS again, then loads OS. every subsequent power off/on is perfect (POST to load OS).
this is with classic BH in yellow on SD core.
Pershoot the switch at the back of the PSU is the same as removing AC. So, your ram first starts at the 2.7V, resulting in black screen, BUT the BIOS code would have reached the point when it switches over to the CMOS defined VDimm voltage. So, the next restart will give your RAM the CMOS Vdimm and you start all fine and dandy. My theory.
Nope. Just to be clear, the voltage is there only when I remove the AC and reinsert it, a normal shutdown does not have voltage on Vdimm. I think you said it - it must be coming from 5VSB. Maybe it has got something to do with that CMOS setting, unsure of wording 'restart machine on power failure', another guess.Quote:
BTW OzSnoal did you happen to check if there was voltage on the pci or PCI-E slots when shutoff as well?
The power being appied to the RAM when the board is not powered is provided by a STR (suspend to RAM) function of the voltage regulator. The NF7 series of boards also have this feature.
From experience of measuring Vdimm whilst booting, the voltage 'spike' will last long enough for it to be measured with a DMM - it can last for up to 2 seconds, and possibly longer. This might be different with the DFI NF4 board tho.
Has anyone tried measuring the voltage 'spike' with no RAM in the board? Doing that might stop the BIOS from loading and thus give the voltage before the BIOS has time to set the Vdimm.
There might also only be certain conditions where the voltage will spike such as on cold boots when the AC power has just been appiled, cold boots when the board has been powered off using the power button, or warm boots after a reset. Using a 20 pin PSU might also have some effect in producing the spike as well.
Quote:
Originally Posted by andyOCZ
In no shape or form was i blame'n the mem. Just the other page had VX with a differnt SPD chip. and hey i just wanted to take a shot for ya guys of both.
Just trying to help out too :) heheh
its the mother board for sure.Im not RMA'n my stuff till i gets fixed hehe
Peace Nugz
So it is not safe to even keep the computer in standby mode to prevent this issue until a fix has been found?Quote:
Originally Posted by persivore
It should be ok to leave it in standby. Its been stated earlier in the thread that the board only gives 2.7v when in standby, so it should be safe :)Quote:
Originally Posted by P_1