ASRock Penryn1600sli-110dB CPU Core Voltage Control
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From: GT on 20 Apr 2010 04:58 "Paul" <nospam(a)needed.com> wrote in message news:hqig5m$vdv$1(a)news.eternal-september.org... > GT wrote: >> I am considering a 2nd hand purchase. The online manual doesn't make this >> clear, so does anyone know if the above motherboard gives full control >> over the CPU voltage - down as well as up - I want to experiment with >> undervolting a core2duo chip for ultimate silence purposes. > > It gives the appearance of being programmable. > > http://www.ocworkbench.com/2008/asrock/Penryn1600SLI-110dB/g5.htm > > CPU Voltage [Manual] > Voltage Value [1.60000V] > > http://www.ocworkbench.com/2008/asrock/Penryn1600SLI-110dB/g1a.htm > > The VCore regulator is the same as the one on my (previous) motherboard. > L6714D. > > http://www.ocworkbench.com/2008/asrock/Penryn1600SLI-110dB/IMG_0484%20copy.jpg > > I guess it is working. They claim to have keyed in 1.4000 volts > and CPUZ shows a lower setting (1.368), so I guess that means there is a > working VCore offset capability on the board. (Since the VID pin values > are range limited by Intel, if you want a boost, it is applied outside > of the normal VID pin control mechanisms. The ST L6714D has an offset pin, > so you can change the output voltage that way. I had to volt mod my Asrock > board, since there is no VCore BIOS setting on my particular model of > motherboard.) > > http://www.ocworkbench.com/2008/asrock/Penryn1600SLI-110dB/asrock%20penryn1600sli-110db%20oc%20to%20495x6%20copy.jpg > > Since it is Asrock, I'd be more suspicious of the implementation. > I've owned one Asrock board, and that was enough for me. > > According to this, the offset pin is only positive. I think this is > the page I found, to help me do the volt mod. Your board probably > already has some mechanism tied to that pin, and perhaps not > exactly the way the datasheet does it. > > http://forums.vr-zone.com/overclockers-hideout/192571-volt-mod-done-right-asrock-775dual-vsta-l6714.html > > From a link on that page, this is the VCore regulator datasheet > for the regulator on the Penryn1600sli-110dB. > > http://www.st.com/stonline/products/literature/ds/12187.pdf > > "12.2 Offset (Optional) > > The OFFSET pin allows programming a positive offset (VOS) > for the output voltage by connecting a resistor ROFFSET vs. SGND" > > So that leaves the question, as to whether there is some way to > effectively undervolt the thing, without screwing up any of the > other parameters of the design. Maybe Asrock figured out some > way of doing that, but my suspicion is, you'll be turning on > EIST and just relying on the Intel range-limited lower limit > to be used, when the system is idle. In other words, if the > offset pin cannot apply a negative offset, you get to enjoy > the lowest voltage the processor supports, simply by turning > on Intel SpeedStep (EIST). > > HTH, > Paul Thanks Paul. |