790i reference board volt mods (UNCONFIRMED mods) >> work in progress

[3oh6]

vSPP done and done. still just getting started with testing though to see how much is needed to get past 560~565FSB benchable with P1/P2 enabled...but can confirm the mod Dinos posted works like a charm with 20K ohm VR. it will raise voltage from what is selected by 0.05v with a 20K ohm VR so just keep that in mind...

vSPP
Dinos post was again bang on and the soldering point was correct. Measured resistance of the circuit was 776 ohms so I went with a 20K ohm resistor. After the mod, resistance dropped to 745 ohms and voltage was 0.06v higher than selected according to the BIOS monitor. I still don't have a confirmed vSPP read point on the board so I am just going with the BIOS reading as it raises with lowered resistance. Very easy to solder to the IC leg and a perfect mounting point, as seen, alongside the I/O tower. Just did it so no testing on whether it will help FSB clocking past 575FSB with P1/P2 enabled.



all vmods that have been tested working can also be found in my MB OC Report.

[RLM]

Great report 3oh6, and nice results

Your soldering work's impressive, well to me anyway.

What sort of wattage soldering iron do you use? Do you just go in with a dab on the end of an iron, or do you use another method? Any tips you can share?

I've vmodded my GX2, but that vdroop mod looks pretty tricky.

RLM

[dinos22]

vSPP done and done. still just getting started with testing though to see how much is needed to get past 560~565FSB benchable with P1/P2 enabled...but can confirm the mod Dinos posted works like a charm with 20K ohm VR. it will raise voltage from what is selected by 0.05v with a 20K ohm VR so just keep that in mind...

Measured resistance of the circuit was 776 ohms so I went with a 20K ohm resistor.

Hey Jody

why not go with a 1K VR

[3oh6]

Hey Jody

why not go with a 1K VR

with a 20K, the voltage was already raised 0.05v above what was selected in BIOS. a 1K would put it through the roof. the resistance of the circuit was 776ohms...general rule of thumb for volt mods is resistance x 20. adjustments come right away after tuning down the VR and it is very nice for adjusting so definitely 20K

and about that 575FSB 32M time...just testing stability. here is the 575FSB balls out, top of my game time on the 9X multi

575MHz x 9 5175MHz / 1078MHz @ 8-7-6
click for full size...


and did you see the Everest (yeah i know, so what)...but still, 15K is just a short watercooled SPP away IMO.

[dinos22]

that's sooooo fast man wow

i didn't realise that there is a rule of thumb like that (about resistance and 20x rule you mentioned)

[3oh6]

that's sooooo fast man wow

i didn't realise that there is a rule of thumb like that (about resistance and 20x rule you mentioned)

yeah buddy, this board is just unreal once you get up this high with P1/P2 enabled. the best part is that once i get FSB pushed higher, if memory won't continue on this ratio, you can just turn down the ratio and basically keep the memory right around 1080MHz with no performance loss.

i can't thank you enough for your initial results post otherwise i would have completely dismissed the reference board and likely got stuck with another Asus turd. this EVGA is just so solid and easy to bench with at these frequencies despite being on the edge of its stability...it is an absolute treat.

as for the 20x rule, it is something you read about every now and then in the volt mod threads, thats where i saw it. it seems to hold true for the most part. in this case with the stock resistance of 776 ohms, multiplying it by 20 gives you about 15K ohms which would be a little low IMO giving about a 0.1v over volt from BIOS setting. so obviously it isn't concrete but generally gets you a good starting point to adjust from.

[zbogorgon]

about Vcore, XFX mobo here, P04 bios, I did the mod with 50k VR and OPV kicked in ASAP, I acctually expect that so I went with 200k and it works now

[dinos22]

about Vcore, XFX mobo here, P04 bios, I did the mod with 50k VR and OPV kicked in ASAP, I acctually expect that so I went with 200k and it works now

i'm confused here
why does one work and not the other