Did you use a 3k resistor on pin10 or was it another value?Quote:
Originally posted by KODE
Just did the Vcore mod (I needed to do pin10 also to avoid OVP). Worked great and Vcore @ 2.33 now.
Regards,
KODE.
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Did you use a 3k resistor on pin10 or was it another value?Quote:
Originally posted by KODE
Just did the Vcore mod (I needed to do pin10 also to avoid OVP). Worked great and Vcore @ 2.33 now.
Regards,
KODE.
UPDATE:
Seems like modding pin 10 does nothing here. I first thought it helped me reach 2.33V but I ended figuring it was just a matter of fine tuning the VR from pin7 (long story).
DeadHeart:
I used a 100K variable resistor, and It was pre-set to 10k, but as I said above It didn´t change anything, the max Vcore I can reach before OVP kicks in is 2.35V.
KODE.
So, modding pin10 didn't help to solve the OVP problem at all?
Yep.Quote:
Originally posted by DeadHeart
So, modding pin10 didn't help to solve the OVP problem at all?
Well, I did it regardless.
Be a pain in the arse to have to remove the board later to do it. One of those just in case mods.
I am sticking alot of stuff in the case, so removing the components will be painful.
So do any of these mods counter the high fsb/high vcore bug?
Hi Hell-Fire,
Just took the pictures (Vcore mod), will pass them to my work PC as soon as possible.
Bundles: I can't tell because even before the Vcore mod I don't experienced the high FSB/Vcore bug.
Regards, KODE.
Here's my Vcore mod pictures as I promised to Hell-Fire:
Diff angle:
Close shot:
is there no way to bypass the ovp?
what resistors did you use to the vcore change?
hope you understand my bad english im swedish and only 15 :)
Damn that is sexy KODE.
Nice job man.
i have looked at the datasheet and im im wondering is it the pin7 that i change vcore at? and 10 the ovp?
then i think i might have found the ocp, the pin19 i think it might be im not sure but i think it is that
if u look on the datasheet theres 5 vid pins, that all go into the - side of a thingy called OVP, and they go through a D/A converter first, so maybe fiddling with those would lift the OVP
also Isen1-4 are sense lines for the current
Has anyone tried desoldering pin #10 and lifting it off the board?
have anyone tested that?Quote:
Originally posted by blinky
if u look on the datasheet theres 5 vid pins, that all go into the - side of a thingy called OVP, and they go through a D/A converter first, so maybe fiddling with those would lift the OVP
also Isen1-4 are sense lines for the current
what of the 8pins should i solder?
If you want to mod Isen lines, you'll have to find resistors connected to pins 12, 13 and 16 of HIP6301 regulator and replace them with bigger ones. This menas you'll have to desolder those resistors, measure their resistance, then add aprox 25% to the measured value and solder new bigger valued resistors on board... This will convince regulator so that it will "feel" lower current... and result of that is less droop voltage. But this mod will not prevent droop from happening. And it can seriously damage your MOSFETs because you set over-current protection to higher level. So be carefull with it.
Better way to do this mod is to find resistor connected between pin 7 and Vcore (R(in) in intersil datasheet) . And bridge it with multiturn trimmer. This resistor controls amount of droop. Shortcircuiting it would mean no droop, but this is not safe and that would automaticaly prevent doing Vcore mod by connecting pin 7 and ground with trimmer...
I would recommend removing R(in) resistor and measuring its resistance. Then I would pick new resistor with half resistance (or maybe one fourth), that can also be done by adding trimmer but you have to know resistance of original resistor...
My current plan is to add fourth phase to the Vcore supply unit. As you can probably see in datasheet of HIP6301 this chip supports 4 phase systems, but on NF7 there are only 3 used. Now I am trying to find an cheap non-working NF7 to pick all the components needed from it, and then I'll add fourth phase to my NF7... If i succeed yo'll be the first to know...
Thanks m8 :)Quote:
Originally posted by Hell-Fire
Damn that is sexy KODE.
Nice job man.
is there any boards that the ovp is disabled on?
the way tribesman described with adding new resistors could that help me reach higher vcore if i have done all the others?
If you want better than 2.3v, then you better be able to provide fantastic cooling.
Not sure if anyone has actually been able to bypass the OVP on the NF7 as of yet.
i know, im gonna have dry-ice or liquid nitrogenQuote:
Originally posted by Hell-Fire
If you want better than 2.3v, then you better be able to provide fantastic cooling.
Not sure if anyone has actually been able to bypass the OVP on the NF7 as of yet.
but what resistors is it that i should replace? i ahve looked at data sheets but i cant find them, the first and second step you talked about where is the resistors you are talking about in that two steps?Quote:
Originally posted by TribesMan
If you want to mod Isen lines, you'll have to find resistors connected to pins 12, 13 and 16 of HIP6301 regulator and replace them with bigger ones. This menas you'll have to desolder those resistors, measure their resistance, then add aprox 25% to the measured value and solder new bigger valued resistors on board... This will convince regulator so that it will "feel" lower current... and result of that is less droop voltage. But this mod will not prevent droop from happening. And it can seriously damage your MOSFETs because you set over-current protection to higher level. So be carefull with it.
Better way to do this mod is to find resistor connected between pin 7 and Vcore (R(in) in intersil datasheet) . And bridge it with multiturn trimmer. This resistor controls amount of droop. Shortcircuiting it would mean no droop, but this is not safe and that would automaticaly prevent doing Vcore mod by connecting pin 7 and ground with trimmer...
I would recommend removing R(in) resistor and measuring its resistance. Then I would pick new resistor with half resistance (or maybe one fourth), that can also be done by adding trimmer but you have to know resistance of original resistor...
My current plan is to add fourth phase to the Vcore supply unit. As you can probably see in datasheet of HIP6301 this chip supports 4 phase systems, but on NF7 there are only 3 used. Now I am trying to find an cheap non-working NF7 to pick all the components needed from it, and then I'll add fourth phase to my NF7... If i succeed yo'll be the first to know...
This is answer to your question Snowman89. This is the first step.Quote:
Originally posted by Holst
Ok here we go.
http://www.intersil.com/data/fn/fn4765.pdf
Pin 7 is the FB pin, so its the usual mod adding resistance from pin to ground for more voltage.. pretty simple stuff
Start off with the highest VR you have on a low Vcore setting (I use 1mo normally) that should be fairly safe)
We can expect that your going to trip the OCP as well.
This will be set by the 3 resistors RsenI 1,2 and 3
Luckily these 3 beastys are easily identified on the board as R166,R167 and R168 they are all about 3k.
The current sense should be linear with the resistance so assuming that Abit set 25% at 2.3v we are overcurrenting by 48% (2.8/2.3 squared) so lets make it 75% over 2.3v which will probably mean around 4.2k resistors (on the board)
So whatever you can get over 4k TBH.
Have fun and dont blame me if it blows up :P (it may do @2.8)
Second mod is much more complicated than I tought, because NF7s Vreg circuit is not made in same way as described in datasheet... But I think that adding a 5kohm var. resistor between legs 7 and 10 of HIP6301 does almost the same thing. Start with highest resistance and then lower it. But never set it to 0 ohm! This mod will also increase Vcpu voltage a bit, that is because the design of NF7 is not like that one in datasheets. I've done it and it decreases Vdroop a bit, but it will never remove it completely....
okey, how high vcore can you run?Quote:
Originally posted by TribesMan
This is answer to your question Snowman89. This is the first step.
Second mod is much more complicated than I tought, because NF7s Vreg circuit is not made in same way as described in datasheet... But I think that adding a 5kohm var. resistor between legs 7 and 10 of HIP6301 does almost the same thing. Start with highest resistance and then lower it. But never set it to 0 ohm! This mod will also increase Vcpu voltage a bit, that is because the design of NF7 is not like that one in datasheets. I've done it and it decreases Vdroop a bit, but it will never remove it completely....
2.3 is the highest I could do. But settings in BIOS were set to 2.175V, because second mod raises Vcore.