Dell T5810 bios mods, motherboard mods, schematic help

[frankr2994]

Hello all. Hoping this is the right section to post and I have 3 questions that any one of them answered should fix me up. So I have a Dell precision T5810 with an E5-1650v3 cpu. I've been overclocking it using throttle stop. I'm at my TDP limit of 140 watts and I can't get past it. Where I'm at right now is in order from best solution to worst.
1 I need an unlocked bios. I have all the ami bios tools and a spi programmer. I've tried modding it and a couple of people from bios mods and win raid tried modding. I can't get any other menus to show up. If someone can successfully mod my bios either graphically or just change the "hidden" settings that would be awesome.
2 I need to modify the current sense circuit for the vrm. I'd like to cut the reported current in half. I have the board out, a couple fluke multi meters and soldering tools. If anyone has info on doing this I have the schematics for the vrm controller and the MOSFETs. I just cannot identify how it is sensing current.
3 if anyone just has access to schematics for this board I'll stare at them until I figure it out.
Other than that if anyone is concerned. I've done cooling mods to the cpu and vrm. Cpu power is off of 2 18amp psu rails and uses a 10 pin eps plug. Vrm is 6 phase with MOSFETs rated at 45amp each. The least rated part of this that I know of would be the 4 caps feeding the vrm rated at 65 watts each. So total max current through the caps is 260 watts. I can't go past 140 right now and I think 200 is all the more I'd want/need.
Any help would be greatly appreciated.

[frankr2994]

Re: Dell T5810 bios mods, motherboard mods, schematic help

Could someone help me identify exactly what resistor this is. I can measure with a caliper if needed. I believe the markings indicate 2.2 ohms. My meter reads 2.4 but also varies .1 to .2 when touching the leads together.

[frankr2994]

Re: Dell T5810 bios mods, motherboard mods, schematic help

Have to quit for the night but I found another pwm controller.on the board a ncp6133. Here is a quote from the data sheet. I think the resistor I pictured above which there are 6 of are feeding it. Here's the quote.

Total Current Sense Amplifier
The NCP6133 uses a patented approach to sum the phase
currents into a single temperature compensated total current
signal. This signal is then used to generate the output voltage
droop, total current limit, and the output current monitoring
functions. The total current signal is floating with respect to
CSREF. The current signal is the difference between
CSCOMP and CSREF. The Ref(n) resistors sum the signals
from the output side of the inductors to create a low
impedance virtual ground. The amplifier actively filters and
gains up the voltage applied across the inductors to recover
the voltage drop across the inductor series resistance (DCR).
Rth is placed near an inductor to sense the temperature of the
inductor. This allows the filter time constant and gain to be
a function of the Rth NTC resistor and compensate for the
change in the DCR with temperature.
Figure 8. 
-
+
CSN1
CSN2
CSN3
SWN1
SWN2
SWN3
Rref1
Rref2
Rref3
10
10
10
Rph1
Rph2
Rph3
Cref
1n
CSREF CSCOMP CSSUM
Ccs1
Ccs2
Rcs2 Rcs1
82.5 k 35.7 k
Rth
100 k
The DC gain equation for the current sensing:
VCSCOMP−CSREF -
 −
Rcs2 Rcs1*Rth
Rcs1Rth
Rph * IoutTotal * DCR
(eq. 2)
Set the gain by adjusting the value of the Rph resistors.
The DC gain should set to the output voltage droop. If the
voltage from CSCOMP to CSREF is less than 100 mV at
ICCMAX then it is recommended to increase the gain of the
CSCOMP amp and add a resister divider to the Droop pin
filter. This is required to provide a good current signal to
offset voltage ratio for the ILIMIT pin. When no droop is
needed, the gain of the amplifier should be set to provide
~100 mV across the current limit programming resistor at
full load. The values of Rcs1 and Rcs2 are set based on the
100k NTC and the temperature effect of the inductor and
should not need to be changed. The NTC should be placed
near the closest inductor. The output voltage droop should
be set with the droop filter divider.
The pole frequency in the CSCOMP filter should be set
equal to the zero from the output inductor. This allows the
circuit to recover the inductor DCR voltage drop current
signal. Ccs1 and Ccs2 are in parallel to allow for fine tuning
of the time constant using commonly available values. It is
best to fine tune this filter during transient testing.
FZ -
 DCR @ 25° C
2 * PI * LPhase
(eq. 3)
FP -
 1
2 * PI * Rcs2 Rcs1*Rth@25° C
Rcs1Rth@25° C
 * (Ccs1 Ccs2)
(eq. 4)

[frankr2994]

Re: Dell T5810 bios mods, motherboard mods, schematic help

Could someone please explain a little about the vsen and vrtn pins 5 and 6 on this schematic?

[frankr2994]

Re: Dell T5810 bios mods, motherboard mods, schematic help

Well if anyone cares I'm going to but some 2.2 resistors and solder them on. Don't have much to go on other than a guess lol. I contacted infenion who makes the vrm controller and MOSFETs for my board and they told me they can't assume what the current sense is on my board and from an inside source the Dell schematic is nda. I've given up trying to meter out guess work so I'm just going with my gut. If I get the board it's 45 bucks. I'm going to stick a cpu on it that I don't want to use Incase I cook that too along with a GPU I don't need a psu I don't need and 1 stick of ram. It could basically catch fire and I won't be out much lol.