here clearer pic
Printable View
here clearer pic
Memory voltage at Bios always at 2,6v right?
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no... u still can set ur voltage from bios
but when u select 2.6V it will give much higher voltage
u can monitor the voltage from pc health status menu
okidoki.... I'll try it and reply here then...
Thanks
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set the 5k pot to max.. lower the resistance for higher vdimm voltage.. cheers
Question:
The last 2 NF7 boards I have done the Vtt mod on are acting weird as hell.
They will only boot with a stick in dimm #3..period.
This is a simple mod, and its clean so I dont think the actual mod work is causing this. I also removed the mod and reconnected the trace, but it is still doing the same thing.
The first 5 boards I did this on it worked perfectly.
Any tips would be apprec as I have tried everything I can think of.
I have tried double and single sided ram btw in all 3 slots.
The voltages at the 56 ohm resistors and the actual Vbt Vreg match perfectly as well.
Sorry I can't help, but I did notice that my board overclocks my BH5 a good 8MHz higher in Dimm3... maybe this is how it was on the stock board, but Im not sure because I modded it before I even tried it out.
Well, someone having the exact same problem I am having said that he flashed to the stock Abit bios and it booted fine with sticks in dimms 1 & 3, but not in dimm 2??
Also, soon as he changed the timings, board wouldnt post again with sticks in 2 dimms. :confused:
I did some testing a while back with different slots and posted my results here... it was using standard D22 if that matters. I have a feeling D10 doesnt drive Dimm3 as hard as the other slots, while non-D10 BIOSes do the opposite, but I have only tested with non-D10.
Sorry I couldn't help more.
this is same problem that i encountered when i decided to make "voltage station" for vdimm, vtt, vref and 3.3vio...Quote:
Originally posted by Hell-Fire
Question:
The last 2 NF7 boards I have done the Vtt mod on are acting weird as hell.
They will only boot with a stick in dimm #3..period.
This is a simple mod, and its clean so I dont think the actual mod work is causing this. I also removed the mod and reconnected the trace, but it is still doing the same thing.
The first 5 boards I did this on it worked perfectly.
Any tips would be apprec as I have tried everything I can think of.
I have tried double and single sided ram btw in all 3 slots.
The voltages at the 56 ohm resistors and the actual Vbt Vreg match perfectly as well.
when i soldered a wire to pin 2 (vtt reading) on the DIMM 1, on the backside of the mobo... after i did that the board started only when i had 1 stock in slot 3... i added second stick and no boot... only one stick in slot 3 let the board start...
also when i switched video card to PCI one, i was able to "boot" with 2 sticks but only to see bootblock failure and request to insert disk with BIOS image (???).
so i removed the wire and soldered it to the cap's leg that is next to vtt IC and now everything is alright...
i have no idea why this happens on your boards, though :(
Quote:
Originally posted by bachus_anonym
this is same problem that i encountered when i decided to make "voltage station" for vdimm, vtt, vref and 3.3vio...
when i soldered a wire to pin 2 (vtt reading) on the DIMM 1, on the backside of the mobo... after i did that the board started only when i had 1 stock in slot 3... i added second stick and no boot... only one stick in slot 3 let the board start...
also when i switched video card to PCI one, i was able to "boot" with 2 sticks but only to see bootblock failure and request to insert disk with BIOS image (???).
so i removed the wire and soldered it to the cap's leg that is next to vtt IC and now everything is alright...
i have no idea why this happens on your boards, though :(
Just to make sure I understand you correctly. You soldered your monitoring wire to the cap leg under the board yes??
Weird problem either way honestly...my board and yours. Wonder if the added resistance caused by the wire is causing a drain or something.
yes sir, that is correct...
btw, this is the "new" NF7-S v2 with all those colors :) the one before died due to some issues i couldn't identify :(
http://www.xtremesystems.org/forums/...id=33552&stc=1
http://www.xtremesystems.org/forums/...id=33553&stc=1
The wire added for voltage reading is likely causing some capacitance load.
What guage wire and how long is it? There are reasons certain sized traces and capacitors are used ;)
EDIT
Pics loaded this time.. ;)
They could be causing capacitance issues, but I also remember reading in a thread yesterday about different bioses (D10 based vs. other) that changed how the nF7 acted towards each dimm slot...
tictac commented in the thread about how tight Abit had made a few settings in the bios I beleive..
EDIT 2
Hey, look what I found! :D
http://www.xtremesystems.org/forums/...5&pagenumber=3
Hi again...I've tried the thing on the pic but my board starts to beep.... and do not boot...Quote:
What am I doing wrong?
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I give up on this newer NF7-S that I did the Vtt to.
It will only boot with dimm 3 and thats it. All the voltages are tracking properly, and I have tried several different bios files.
Arghhh.
I've found a data sheet for what appears to be an overclock controller on the NF7 (the chip below the CPU socket/Vcore MOSFETS)
http://www.attansic.com.tw/english/p.../pdf/atxp1.pdf
It looks like it has 12 general purpose I/O pins, which could be being used to control a DAC to controll the VDimm/Vtt. Could a mod be based around this chip if it was being used to control the Vdimm/Vtt?
I did the VTT mod today with a 1KOhm variable resistor, and at its lowest resistance (1 Ohm), the VTT will not go lower than half of my 3.3V line (1.63V, because my 3.3V line is a tad low). I have done the VDIMM=VIO mod, but my VDIMM is usually only 3.2. I cannot get VTT any lower no matter what I do.
I've almost given up trying to get 240 FSB stable. Can my board be that bad? I have the VDD set to 1.8 and 3.2 volts running through my PC3500 EB. I have a feeling that I SHOULD be able to get to 250 FSB, but something is not letting me. I would really love any help anyone can give me. Thanks in advance.
The vtt works the other way, you set the VR at 0 Ohms and then increase the resistance to increase the Vtt, and thats if you did the Vtt mod this way:
http://s6.invisionfree.com/undercloc...?showtopic=100
Sure you've connected the VR legs the right way??? (pins 1 and 2)
I must not have said that clearly enough. Everything was set so that raising the resistance of the VR increased VTT.
Upon further prodding with a multimeter, it appears that VTT is, indeed, half of VDIMM. I measured VTT on the board and I measured VDIMM using the VDIMM mosfet near the DIMM slots. VTT is exactly half of that.
Now I'm even more puzzled as to why my board refuses to do more than 227 stably. Argh.
which BIOS are you using?
and what timings have you tried? I found my Micron based memory worked better with CAS 2.5 than CAS 3 on some BIOSes... and D10 MantaRaysXT worked best for me
I am using Tictac's D26 Mantaray (non XT). The XT version didn't let me get as high as the regular one.
My board has not liked D10 BIOSes in the past... I couldn't even get above 200 FSB.
As for timings, 2.5-2-2-5 gives me memtest errors earlier than 3-2-2-5. Setting timings to 3-3-3-11 or even 3-5-5-11 will error just as fast as 3-2-2-5. It appears to be my motherboard.
Thanks for all your help, guys. On a brighter note, I have buyers for my CPU and motherboard should I give up and decide to go Athlon 64. :p: :rolleyes:
Sell it and go AMD64 DFI :D
I was in exactly the same position as you... got to a point and couldn't get beyond it no matter what... decided to sell my trusty NF7 and am now building a DFI 250GB UT... Do the same :) Your RAM should do a lot better on an AMD64 too
:toast: So how do those s754 3000+s seem to be clocking? :D
I'll see if raising VDD helps my overclock at all. If not, I'll have to weigh my other options.
You can get a cheap Mobile 2800+ or Mobile 3000+ from excaliberpc... they should clock nicely :)Quote:
Originally Posted by mcnbns
I found Vdd had to be well tuned on my old NF7-S... too low and it would freeze and crash in 3d and memtest... too high and it would BSOD... 1.6v-1.7v was my happy medium... i tried between 1.6v-19v.
I am not sure I follow what you are saying.
You want the Vtt to be 1/2 of your 3.3v rail if you have done the Vdimm=Vio mod.
You should get to 240, atleast for benching.
Quote:
Originally Posted by mcnbns