I'm needing to up the vmem to 3.0v or more, anyone know of a Vdimm mod for the P4C800 or P4P800 ??
Printable View
I'm needing to up the vmem to 3.0v or more, anyone know of a Vdimm mod for the P4C800 or P4P800 ??
Any clues as to a Vdimm mod !!!!!
I'm going to keep this post at the top guys !!!
locate LM358 (between southbridge and DIMM slots), pin6 to GND via 50k VR
Macci does it again :):toast:Quote:
Originally posted by macci
locate LM358 (between southbridge and DIMM slots), pin6 to GND via 50k VR
OPP
I went and got one of these P4C800s today, nice mobo, I just hooked it up to my VapoChill, I broke my Prometeia trying to bend the Evap to fit sideways:(
Vapo is doing well though:)
OPP
Quote:
Originally posted by macci
locate LM358 (between southbridge and DIMM slots), pin6 to GND via 50k VR
Oh my God !!!!!!
I love you ! (well sorta if you know what I mean !) ;)
Oh my God !!!!!!
Oh my God !!!!!!:toast:
Sorry about that, it happens alot from what I've seen. :(Quote:
Originally posted by OPPAINTER
I went and got one of these P4C800s today, nice mobo, I just hooked it up to my VapoChill, I broke my Prometeia trying to bend the Evap to fit sideways:(
Vapo is doing well though:)
OPP
Good luck with the P4C800 Opp !!!;)
It works like most I guess, lower resistance yeilds higer voltage ???Quote:
Originally posted by macci
locate LM358 (between southbridge and DIMM slots), pin6 to GND via 50k VR
And where to meassure Vdimm ?
Try the bios for measurment :D
Asus never monitors the memory voltage in their bios !:(
I wish it was that simple
is that chip large enuff to get grabbers on or is it a solder only job?
im getting the asus anyway though.
its quite funny the last asus i ever used was also the last intel rig i ever had, a p2 450 several years ago. the day i go back to intel after using nothing but abit, im gonna end up with an asus again :p
Grabbers work nicely. and lower resistance = higher voltage
Measure voltage from the mosfet near the LM358 chip right next to AGP slot. Find the correct measurement location before you mod it thou (set bios to like 2.85V and find the correct mosfet for 2.85V reading, then install the VR and watch the voltage go up)
great job there macci. :toast:
i've been looking for the vdimm mod for a while too.
the LM chip itself does not support higher than 2.85vdimm? was hoping ASUS could out a bios that does 3.2vdimm :D
max i could get my HyperX 3500 is 231MHz 1:1 2.5-3-3-6.
bandwidth is around 5510mb/sec in sandra.
there's something i dun get
why does running 5:4 (say 250:200) have higher bandwidth than running 1:1(200:200) ?
So your saying start out with the vdimm at it's max of 2.85??Quote:
Originally posted by macci
Grabbers work nicely. and lower resistance = higher voltage
Measure voltage from the mosfet near the LM358 chip right next to AGP slot. Find the correct measurement location before you mod it thou (set bios to like 2.85V and find the correct mosfet for 2.85V reading, then install the VR and watch the voltage go up)
There you go, for everyone that hasn't found the spot yet for the vmem reading!
http://sapp.telepac.pt/raptor/vmem_reading_2.jpg
Macci m8, great job once again! ;)
Thanks again macci for sharing that with us !!!
:toast:
YES!! THANK YOU macci:)
This should help me get my Twinmos going good.
Raptor that was quick !! I looked around last night for a mosfet I could take a measurement from and couldn't find the right one. That one is hidden under my video card ! hehe
would love to see that pic's link fixed Raptor :smileysex
here is the picture
http://clarisseau.homestead.com/file...esurepoint.jpg
I just finished the mod, I set the ddr voltage to 2.55 in bios first, then with memory out of the board, adjusted to 2.85v (.3 overvolt) this gave me a range of 2.85-3.15v. when bios is set to 2.85= 3.15v
Will post OC results in an hour or so
Good Luck :)Quote:
Originally posted by Major Slaughter
I just finished the mod, I set the ddr voltage to 2.55 in bios first, then with memory out of the board, adjusted to 2.85v (.3 overvolt) this gave me a range of 2.85-3.15v. when bios is set to 2.85= 3.15v
Will post OC results in an hour or so
I'm heading to Fry's to get a 50k VR, and then I'll see what I can do with this Twinmos.
Also I just used Pin 4 on the chip as grn, so vr goes between Pin 6 and Pin 4
Raptor I hope you don't mind me using your Pic !!! hehe
can we get a pic of the VR solderd in so i know exactly where to put it thanks.
AZN :
Welcome to Xtreme. Nice to see you here. :banana:
Don't forget to update your avatar with something like this ;) :
AZN, welcome to Xtreme! :toast:Quote:
Originally posted by AZN
can we get a pic of the VR solderd in so i know exactly where to put it thanks.
Major already marked the pic, you may have just missed it. I circled the vr chip in red. It's the two green lines on the pins inside the circle.
Jupiler...Alyssa Milano...MMmmmmmmmmmmmm....:D
I posted the pic because AZN's avatar over at overclockers forum is Alyssa. Wanted to be sure he updated his avatar.Quote:
Originally posted by BrainStorm
Jupiler...Alyssa Milano...MMmmmmmmmmmmmm....:D
Anyway, she's hot. :D
can some1 post a pic with it done.
does it matter which direction u put the VR on? i never used a VR before. BTW VR is voltage regulator right? and this 50k resistor is adjustable right? can i get it at radio shack?
Yeah she is...my problem is I remember her from Who's the Boss when she was about 12 and I was about 24! :lol: But I'm sure I could get over that now that I'm 43 and shes 31 :DQuote:
Originally posted by Jupiler
I posted the pic because AZN's avatar over at overclockers forum is Alyssa. Wanted to be sure he updated his avatar.
Anyway, she's hot. :D
It doesn't really matter what direction you put it on but depending on which leg you have used, you will have to turn the screw the opposite way to increase/decrease the resistance. Make sure you use the middle leg and then either end leg.Quote:
Originally posted by AZN
can some1 post a pic with it done.
does it matter which direction u put the VR on? i never used a VR before. BTW VR is voltage regulator right? and this 50k resistor is adjustable right? can i get it at radio shack?
VR is a variable resistor, also known as a potentiometer, or pot. They look like the blue boxes with leads (legs) in the attached pic, and yes you can get them at Radio shack (see pic on right side - sorry it's so bad).
y is there 3 legs if we only use 2?
once i got them in place can i adjust it while the board is on in the bios and will the voltage go up and down as im adjusting it?
I'm not sure why they make them that way. And yes, once n place, you can adjust while in the bios and see changes. Just be careful, though, I have heard of folks killing a board making adjustments that are too large too quickly. You need to go small adjustments at a time, and let the board stabilize between them.
EDIT: I was wrong about the point above and doing this live through the BIOS since the ASUS board doesn't show you the vdimm. See Major Slaughter's post below
Do you have a digital multimeter (DMM)? The best thing to do is to check your resistance with a DMM before you ever connect to the motherboard to make sure you don't accidentally fry something by hooking it up with the pot set at too little resistance/too much voltage.
thats what i do, attach the 2 pins im going to use to the multimeter and adjust the pot so its at maximum resistance which with my pots basically means it has virtually zero effect on the voltage. then i can connect it safely and turn it up.
my pots look like
http://www.darkcity.nildram.co.uk/pot.jpg
All I could dig up today is 100k VR
That should work as well as a 50K "RIGHT ??"
Are you going to get it fixed here in the states? I heard that therer is a better flexible hose that you can use. Let me know what you decide would ya.Quote:
Originally posted by OPPAINTER
I went and got one of these P4C800s today, nice mobo, I just hooked it up to my VapoChill, I broke my Prometeia trying to bend the Evap to fit sideways:(
Vapo is doing well though:)
OPP
Oh yeah, and sorry about the mishap.
Nate
Yeah, you can use those kind too, but they're more expensive. Mine were 85 cents at the local surplus electronics store. :)Quote:
Originally posted by Ewok
thats what i do, attach the 2 pins im going to use to the multimeter and adjust the pot so its at maximum resistance which with my pots basically means it has virtually zero effect on the voltage. then i can connect it safely and turn it up.
my pots look like
http://www.darkcity.nildram.co.uk/pot.jpg
Yeah, it should work, it will just be a little harder to get the "fine tuning" right since an equal turning of the screw will have a greater effect on the resistance.Quote:
Originally posted by Blue078
All I could dig up today is 100k VR
That should work as well as a 50K "RIGHT ??"
What part of Dallas you in?
Mesquite. Hay! I didnt even notice, your from Plano :cool:Quote:
Originally posted by BrainStorm
Yeah, you can use those kind too, but they're more expensive. Mine were 85 cents at the local surplus electronics store. :)
Yeah, it should work, it will just be a little harder to get the "fine tuning" right since an equal turning of the screw will have a greater effect on the resistance.
What part of Dallas you in?
OH and thanks
Welcome to the Xtreme AZN glad you made it over from Overclockers !!! :)
yea a 100k will work fine, your adjustment will be very sensitive though so be careful, just alittle bit of turn might result in a big jump in voltage. Also be sure to adjust this WITHOUT your memory installed.Quote:
Originally posted by Blue078
All I could dig up today is 100k VR
That should work as well as a 50K "RIGHT ??"
Also you might want to use a 10 turn or more pot, it alows for finer adjustment.
Cool Thanks guys :)
i bought 3 VR so which should i use? and how the heck do i use it i never done this before. can i adjust this while in the bios so i can see the voltage go up and down?
http://home.attbi.com/~aznakano1/pot.jpg
The 47K should work fine, but it will be very sensitve to adjustments so be carefulQuote:
Originally posted by AZN
i bought 3 VR so which should i use? and how the heck do i use it i never done this before. can i adjust this while in the bios so i can see the voltage go up and down?
No you will have to use a multimeter to adjust the resistor to the proper voltage while measureing on the leg of the mosfet AZN. The Asus bios does not report Vdimm. Once you have it set to the amout of overvolt (I did mine for .3v) then you can change the Vdimm just like before using the bios, only it will now be overvolted to whatever you set the resistor to.
.3v overvolt
2.55=2.85
2.65=2.95
2.75=3.05
2.85=3.15
which of the 3 pins to i use on this circle VR? i put it between the 2 grn lines off the pin 4 and 6 right? and i use that other thingy tward the top of it to measure the resistance or voltage with a meter right? where do i put my ends to test voltage? im still alittle foggy on this. i would like to have a complete pic so i know where to put stuff. i think newegg will have to send me another board cuzz mine is about to go up in flames. some1 be more clear to me cuzz im blind at the moment.
Let me double check my self OK
I need to start out at 50k and work my towards 20k correct??
THANKS
http://forum.oc-forums.com/vb/showth...ighlight=vdimm
see thats very detailed with pics to how and check voltage and stuff. can i get something detailed like that cuzz im about to trash a $200 board :)
Major, do you know what resistance your pot is set at now that you are at the right place (i.e., what resistance should folks be shooting for to get the +.3v's you got)?
That looks like a nice little "how to." Interesting that he apparently did it with his memory in the board.Quote:
Originally posted by AZN
http://forum.oc-forums.com/vb/showth...ighlight=vdimm
see thats very detailed with pics to how and check voltage and stuff. can i get something detailed like that cuzz im about to trash a $200 board :)
yep start with the pot adjusted to the highest resistance.Quote:
Originally posted by Blue078
Let me double check my self OK
I need to start out at 50k and work my towards 20k correct??
THANKS
BrainStorm, the pot I used has one of the legs removed so I cant take an accurate resistance measurement with the other two legs since they are in parallel with the on board resister. So I don't know what value it is set at ! sorry.
AZN if you will wait a day or so before trying the mod I'm sure we will have some pics uploaded that illustrate the mod better. Its only been a day since macci posted the mod ! hehe
so if u take the ram out u can still check the voltage right? u just will get the annoying beeps but other then that everything will work the same? i still dont know where to put the DMM to see how high the voltage isQuote:
Originally posted by BrainStorm
That looks like a nice little "how to." Interesting that he apparently did it with his memory in the board.
Definitely start at 50k ohms and work your way towards less resistance.Quote:
Originally posted by Blue078
Let me double check my self OK
I need to start out at 50k and work my towards 20k correct??
THANKS
Major Slaughter
turn ur AIM on so i can chat with u. its to late i already killed my board thx.
JK i'll wait a day. :)
AZN Btw its the same mod as the P4G8X ! just the parts are located differently on the P4C800. Also instead of measureing off the coil, the Vdimm measurement is off the leg of the mosfet.
Right be sure and do this mod WITHOUT your memory installed just incase you go too high with the volts.
To measure the Vdimm set your multimeter to DC volts, place the red lead on the leg of the mosfet thats illustrated in the pic. and the black lead to any ground on the mb or case gnd.
Major slaughter turn ur aim on :)
Given what Major has said, I would say yes, you can do this and check the voltage without the memory in (yes, I would think you will get the annoying beep). The measurement spot is the mosfet leg circled in green in the pics above.Quote:
Originally posted by AZN
so if u take the ram out u can still check the voltage right? u just will get the annoying beeps but other then that everything will work the same? i still dont know where to put the DMM to see how high the voltage is
As Major says, there will undoubtably be some better pics of all this soon if you are not sure about what you're doing right now. No reason to be in a hurry to blow your board up :D
Major, you didn't do this your usual way with the grabber and the fan header ground where you can take it right off, measure the resistance, and put it right back on? ;)
OK I set vdimm IN the BIOS to 2.55v
Then I installed a 50k VR {brother just brought me one}
Set the VR to 50k measured with a Fluke 88
But when I start the PC and read the MOSFET it starts out at "2.945v" and the only way I can go is up volts ????
I rechecked the VR twice now and it is set to 50K??
BrainStorm I'm actually using all of the fan headers on this board so I had to soldier it in.
Blue078, make sure your measuring the correct leg of the mosfet first or the correct mosfet.
Also make sure that the bios is actually set to 2.55 and not to 2.85, I got a .1 overvlolt with my pot set to 50k to begin with so if its set in the bios to 2.85 then 2.95 is about right for 50K
No I set the BIOS to 2.55.
I'm geting a .4 offset
I also measured in the dimm slot at pin #1, so I'm sure I got the right MOSFET.
Guess I'll roll with it and see if I make smoke :D
Blue078, I'm a little confused by what you said. You said you installed the mod before you tested the resistance of the pot. Could you be measuring the total resistance across the circuit at 50k ohms rather than the resistance across just the pot (i.e., you should be measuring the resistance of your pot when it's not hooked up)?Quote:
Originally posted by Blue078
No I set the BIOS to 2.55.
I'm geting a .4 offset
I also measured in the dimm slot at pin #1, so I'm sure I got the right MOSFET.
Guess I'll roll with it and see if I make smoke :D
If you're sure you're measuring everything correctly, you could always try the 100k pot you have set to about 60k and see what it says.
Sorry I tend to not make myself clear some times:)Quote:
Originally posted by BrainStorm
Blue078, I'm a little confused by what you said. You said you installed the mod before you tested the resistance of the pot. Could you be measuring the total resistance across the circuit at 50k ohms rather than the resistance across just the pot (i.e., you should be measuring the resistance of your pot when it's not hooked up)?
If you're sure you're measuring everything correctly, you could always try the 100k pot you have set to about 60k and see what it says.
Yes I measure the POT {VR} before I installed it. set it to 50k
checked it twice.
Without the memory in the slots I get a +0.4 offset @ 50k
With memory in the slot I get a +0.1 offset @50K
I'm sure the reading are pretty accurate my fluke 88 is a dam good DVOM better be it set me back $420, I use it at work.
I didn't have that issue with the memory removed, weird.
Atleast you are up and going now.
Where you running the Vmem at 2.85 b4 you changed your bios to 2.55 ?? maybe the bios didn't (couldn't) reset your Vmem to 2.55 without the memory installed ??
Umm no I set the vdimm in the BIOS with the memory in rebootedQuote:
Originally posted by Major Slaughter
I didn't have that issue with the memory removed, weird.
Atleast you are up and going now.
Where you running the Vmem at 2.85 b4 you changed your bios to 2.55 ?? maybe the bios didn't (couldn't) reset your Vmem to 2.55 without the memory installed ??
went back in to the BIOS and double checked myself, then powered off and did the mod:)
It's working, I just decided to now, boot into windows, prob pin #1 in the dimm slot, and adjust "ever so slowly" till I get the voltage I want in windows.
I noticed before the mod that by probing pin #1 in the dimm slot at boot up, the board really fluctuates the vdimm like it shoots all the way to 3.0v for a split second.
Hmmm...that's interesting. Well, it sounds like all is good at the moment. Looks like you will have to do your twekaing with your memory in the slot. Be careful and good luck!Quote:
Originally posted by Blue078
Sorry I tend to not make myself clear some times:)
Yes I measure the POT {VR} before I installed it. set it to 50k
checked it twice.
Without the memory in the slots I get a +0.4 offset @ 50k
With memory in the slot I get a +0.1 offset @50K
I'm sure the reading are pretty accurate my fluke 88 is a dam good DVOM better be it set me back $420, I use it at work.
Thanks TX :DQuote:
Originally posted by BrainStorm
Hmmm...that's interesting. Well, it sounds like all is good at the moment. Looks like you will have to do your twekaing with your memory in the slot. Be careful and good luck!
This is the best I could get out of her stable, 240mhz 1:1 2.5-4-4-8 @3600mhz.
I'll probably leave it at this for a while, I lost 120mhz on the OC by going with 1:1 instead of the 5:4 divider, but my memory bandwith is alot higher and the system "seems" more robust. + I'm able to do this at 1.6v vs 1.7v
Also the New beta bios v1007.006 rocks !!!! really improves memory bandwith and seems just as stable if not more so than v1006
And for the cpu, not too far off from the 248 5:4 @ 3720
Nice stuff guy's! :)
Going to buy latter a 50k pot and make an article for "my" website! maybe an english version! ;)
??? I dont get it. This is what I get at 280fsb 5:4 mem
is lowering the timings make that much differance?
someone know if it's the same mod for the P4P800??? OPP has it... OPP, does you know if it work on the P4P800???
Quote:
Originally posted by Blue078
??? I dont get it. This is what I get at 280fsb 5:4 mem
is lowering the timings make that much differance?
Try the New Beta bios v1007.006 It will get you up and over 6000 easy with turbo mode enabled !!!!!
ftp://ftp.asus.com.tw/pub/Asus/mb/sock478/P4C800/
At 280MHz FSB 5:4 i get this:
http://sapp.telepac.pt/raptor/280fsb.jpg
I'll look into it today or tomorrow, it has the same IC in the same location so it's very possably the same mod.Quote:
Originally posted by Dirty_Punk
someone know if it's the same mod for the P4P800??? OPP has it... OPP, does you know if it work on the P4P800???
OPP
Quote:
Originally posted by Major Slaughter
This is the best I could get out of her stable, 240mhz 1:1 2.5-4-4-8 @3600mhz.
I'll probably leave it at this for a while, I lost 120mhz on the OC by going with 1:1 instead of the 5:4 divider, but my memory bandwith is alot higher and the system "seems" more robust. + I'm able to do this at 1.6v vs 1.7v
Also the New beta bios v1007.006 rocks !!!! really improves memory bandwith and seems just as stable if not more so than v1006
MS, I agree, running the CPU/memory at a 1:1 has a better overall system value for me. I'm waiting on some OcZ2700's that fdo 2-3-3-6 @ 466. . . . we shall see. . . . . .
Ok I see now, I get better membandwidth at 5:4 for 224mhz mem
than 1:1 for 224mhz mem.
I see, but dont understand???
Oh the P4C800 vdimm mod works great:)
Thanks again to all that made it possable.
Cool glad to see you got it working !
Thanks goes to macci !;)
240Mhz @3.09vdimm:) THANKS macci
Thats where I toped out too Blue078 ! same timmings and all.
I can boot and run "some" benchies at 245Mhz but I ant gona lie and say it's was stable;)Quote:
Originally posted by Major Slaughter
Thats where I toped out too Blue078 ! same timmings and all.
I just need a faster chip, this 2.4 just dont have enuff horse power for me.
hehe, you probably just need better cooling on that 2.4 ! macci hit 4+ gig with a 2.4 and r404 promie !!!!
With watercooling this chip wont budge past 3.430mhz.:mad:
I have a 2.53C1 thats been happy for months at 3.6ghz on air.
So this chip has been a downgrade for me LOL!
OH ! didn't know you where using water. :(
what voltage are you at ??
thx major slaughter. i still got more tweaking to do but this is what i score from my pc3200 buffalo bh-5 winbond modules from newegg for $45 256mb. im running at 3.09v right now
http://home.attbi.com/~aznakano1/309.jpg
Holly cow AZN, go to work and see if you can hit 7000 !!! hehe
Hey are you using the beta 1007.006 bios, it helps !
Quote:
Originally posted by AZN
thx major slaughter. i still got more tweaking to do but this is what i score from my pc3200 buffalo bh-5 winbond modules from newegg for $45 256mb. im running at 3.09v right now
http://home.attbi.com/~aznakano1/309.jpg
Azn, have you tried running your RAM at 1:1? ? ? Your FSB is impressive, but the bandwith on the memory is a little low. Try running the FAB at 236Mhz and Ram at DDR400 and see where your memory score go. I bet you can surpass 7K. . .
Major... So what kinda cooling are you using?? defaultQuote:
Originally posted by Major Slaughter
OH ! didn't know you where using water. :(
what voltage are you at ??
AZN.... WoW ! what else can I say, but Amazing:toast:
No I'm using water cooling, Swiftech MCW5000, Eheim 1260, 2xDTek heater cores
WOW ! I'm useing a MCW5000 also but no TEC, Eheim 1040 and a 80chevy PU heater core with 2 120mm fans for the rad.Quote:
Originally posted by Major Slaughter
No I'm using water cooling, Swiftech MCW5000, Eheim 1260, 2xDTek heater cores
That sounds like a good wc setup Blue !
I'm going to pelt my cpu next week and see what happens. If I'm not satisfied then I guess I'll have to find a way to fund a promie.
I had the money set aside last payday to get a promie and was going to put in with my NF7-S and XP2700, but I decided to go with the Intel mb and chip instead.
Nice OC AZN.....:toast: cant wait to sell my AMD stuff and get a 2.4c and P4C800..... at that speed AZN are you cpu or mobo limited? I wanna know if 300fsb is possible with vdimm mod and watercooling.....
Anything new on the P4P800 thingy, Oppainter?
Does this mod work here, too?
tnx, i hope it works :)Quote:
Originally posted by OPPAINTER
I'll look into it today or tomorrow, it has the same IC in the same location so it's very possably the same mod.
OPP
i can get into windows at 300fsb and so some screen shots but its not 100% stable. as of yet im not sure if the board or chip is limiting me at that speed. im still working on getting 300fsb stable.Quote:
Originally posted by luihed
Nice OC AZN.....:toast: cant wait to sell my AMD stuff and get a 2.4c and P4C800..... at that speed AZN are you cpu or mobo limited? I wanna know if 300fsb is possible with vdimm mod and watercooling.....
what ram is the best to get now that we have all this voltage at our disposal?? :D (im leaning towards geil ultra plat 3500) also, where's a good place to get a high ocing 2.4c? thanks!
do you need special tools to vdimm mod? i can make my ram run at 2-3-3, but i cant get it to run at 2-2-2. id like to do it, but i have absolutely no idea how, thanks
AA, you dont need any special tools, you need a soldering gun, solders, some wires, and a 50K VR.
Study the pics in this thread carefully, locate LM358, clear your mind, try to have your hands as stable as possible, then just do it! Meditating is optional though.
You can probably also do it with SMD grabbers instead of soldering if you don't have any experience soldering.Quote:
Originally posted by starck
AA, you dont need any special tools, you need a soldering gun, solders, some wires, and a 50K VR.
Study the pics in this thread carefully, locate LM358, clear your mind, try to have your hands as stable as possible, then just do it! Meditating is optional though.
well is there any benefit/noticable difference of running a high voltage thru your ram, just so you can get 2-2-2 timings? what do i have to do to the lm358?, remove it? if i did, would 2.85 VDIMM = 3.1? im not quite sure how i'd measure the voltage
btw my timings now are 2-4-4, ram is @ 370 Mhz, 1 512 stick of pc2700
AA I wouldnt recommend you to do the vdimm mod if you're running single channel. if you really wanna do the mod, then maybe like what Brainstorm says, get some SMD grabbers, DO NOT remove the LM358, use a pair of grabbers to grab pin 6 and the other to ground, you still need to solder a VR to both wires though. there are a few guides in the extreme guides section i believe.