NF7 rev2 VTT mod need it so bad...

[tictac]

sorry i must admit that.... that is fact... the bios sux a big time....

the bios is still limiting the fsb performance
i manage to locate 1 more table... but i cannot assure it is memory timing table

but i check it from D10 to D23
here is the result:
D10
D11
D12
D14beta
D16
D17=D18
D19=D20
D21=D22
D23

So there is 9 difference table.... should i mod this? and the question is how do i mod this? the hex code killing my brain...

[Dani]

Originally posted by tictac

if i can locate the memory timing table we may have bigger chance to hit higher fsb and higher memory memory bandwith

Yes thats the truth, some more FSB we can get some nice scores even when our CPU MHz is'nt so BIG

[Dani]

Originally posted by tictac
sorry i must admit that.... that is fact... the bios sux a big time....

the bios is still limiting the fsb performance
i manage to locate 1 more table... but i cannot assure it is memory timing table

but i check it from D10 to D23
here is the result:
D10
D11
D12
D14beta
D16
D17=D18
D19=D20
D21=D22
D23

So there is 9 difference table.... should i mod this? and the question is how do i mod this? the hex code killing my brain...

THat's lot , but if you found that little secret that hold FSB down I come down there and we take some beers

Jeah, I know, it needs time to search and guys to test

[tictac]

keep back on topic:

Good Luck Malves ...... :thumbsup:

p/s: Dani... ya it takes time to solve the hex code...

[Dani]

Originally posted by Malves

Vcore for the NF7 is the usual HIP6301. Pin 7 to pin 9 (GND) via 50k trimmer.

, how far can I go with Vcore? 2.4V?
If 2.4V so in reality that will be someting around 2.28-2.3V under pressure?

NOOOOOO, I got a BIG sink on that chip

[tictac]

very big heatsink dani.... hehehe

[Dani]

Nice pic, I remember those days, some day more CO2
But I cant get it off and I cant solder under that sink

Hmm, however, I will twist it off..

[pcwhisperer]

Can someone please explain to me why the 3.3 rail leg gives more than i messeure on the 3.3 atx connector. Vdimm is between 3.34 and 3.37 it seems . Vbt/vtt is 1.7 so thats fine with me. On the atx connection 3.3 gives 3.34 like it should equal to Vdim. But where comes the extra volts from ? The rail leg gives 3.66 volts . Should i be worried about this or is it normal?
Oh and my lvl2 ram that primes happy on another nf7-s 238 5-2-2-2 with "old school Vmem mod" . Now it gives me nothing but errors in memtest86. KHX3500 c2 runs wel on it and not on the old one , go figure
And please forgive my bad englisch as well

[Dani]

It's not normal cos thats impossible, you cant have more Vdimm that PSU's +3.3V can give out...

[pcwhisperer]

The pin on the bottom right side gives my dmm 3.66 volts. If i had company at this time i would take a pic of its display. So its not oke then. Most have done something wrong . Gonne undo it for now. Will try the Vtt=Vref later on my other board.

[uwackme]

Malves... on the 3 pin thing... DONT. What you do by grounding the 3rd pin is connect a resistor from the Vdimm mod point, to gnd....that resistor being an R= full value of your POT. While also having a sliding scale from the 2nd pin. It sets up a voltage divider ON TOP OF a voltage divider. You really dont wanna be doing that, trust me. Just disconnect the 3rd-pin to ground lines you put on, the rest will work just fine....you will prolly have to re-adjust your pots. Best to set them BACK to start point, remove ground lead, and re-adjust your V's.

Tic'y!!! Dont despair old buddy, you'll get to the bottom of it.. you're bigger than any bios. The D10 and D23 tables are the only ones that matter.....see I just saved you tons of work

******** SADDENZ

Damn, I looked under the heatspredder... my 2x 256 are CH5 too, just damn nice ones. I NEED 2x 512M BH5..... any ideas.

********

PC... you measure Vdimm on the LEFT leg of the Vdimm mosfet...the BIG one near the Vdimm mod resistor. The RIGHT leg is part of the flyback/regulator circuit and isnt really relevent, it will be some voltage higher than Vdimm or 3.3Vrail. Only yhr 3.3Vrail at ATX connector, and the Vdimm leg (and Vdd pins of DIMM connectors...pin7,15,etc) matter. 3.3Vrail needs to be HIGHER than the Vdimm you want to set, or the regulator wont operate correctly. Vref is measured on pin 1 of DIMM socket.

Usually this involves a POT inside the PSU, or a mod to the BROWN 3.3V sense line on the ATX connector. Read about 3.3Vrail mod's in other threads here.

[Rabbi_NZ]

just dropping in so i get regular updates.... keep up the great work!
________
VN1500G

[Shroomalistic]

*****WELCOME TO XTREME RABBI_NZ*****
good ot have you here, welcome to the addiction!!

[bachus_anonym]

Originally posted by uwackme
Damn, I looked under the heatspredder... my 2x 256 are CH5 too, just damn nice ones. I NEED 2x 512M BH5..... any ideas.

uwacme, believe me, 2x512 MB BH-5 ( i have 1GB kit of PC3500 LvL II lying around waiting for Socket939 ) sucks big time as far as OCing goes... i just pulled 'em out again to test it two days ago and I'm still dissapointed. here's a cocnclsion about 11-2-2 cas2 tests:

1. before any mods - it hit the wall at at exactly 217FSB (2x512 Dual) at 2.9v... that's primestable for 8hrs (i stopped ir after)

2. after vdimm and vdd mods - guess what? same thing... even 3.4 volts can't make it to work at anything over 220FSB (i'm still talking prime95 stability)

3. after vtt mod - still dissapointed...

but... 1 stick 512 passes 3dmark01 with flying colors at 242FSB...
so one double-bank BH-5 is still sort of OK, but adding second one brings whole setup down down down...

2x256 + 1x512 maxes out at 232FSB...

so 2x512 BH-5 at 11-2-2 cas2 on NF7-S is no OCer's dream...

[Rabbi_NZ]

my pc3500 level2 did 2-2-2-11 229FSB @ 2.9v MemTest stable... didnt try Prime tho..
________
TS90

[Dani]

The truth is nForce2 mobos dont like double sided memorys, one side memory -->

[Dani]

With VBT/VTT mod Prime95 stable @ 240.5*10.5 ~2h cas2-2-2-5 Dual 1:1 and Prime95 is still running

[bachus_anonym]

Originally posted by Rabbi_NZ
my pc3500 level2 did 2-2-2-11 229FSB @ 2.9v MemTest stable... didnt try Prime tho..

sorry, but memtest means nothing, even new one.... i get no errors in memtest at 251FSB ATM 2x256 11-2-2 cas2, but it's nowhere near stable. goldmemory, that's what stresses memory.

[Dani]

My KHX3000*2 did 247FSB cas2-2-2-5 Dual 1:1 for 3h MemTest 1.11 Test #5 but 248FSB could not pass 1 minute

[uwackme]

Yes, I agree, its hard to get it there, but I'd be happy with 250Mhz x10 at 11,3,2,2 from BH5 that's still almost 10% faster than my 230 now. Man that last 10% is a beeatch...but isnt it always ;-) But I figure if my setup is getting this much from CH5 then BH5 can only do better....one would hope? Effectively I have 2x doublesided at the 1Gig setting now.

Other factors come into play, BA you may just have a northbridge that needs more hand holding....lapping, cooling, more/less Vdd. But I know what you mean about memtest....245@ 11,2,2,2 with my 2x 256 but they crap out the second I go to do something real beyond SiS memory bench or CPUZ, browsing, etc. Any 3D and crashola. Where as 245@11,3,3,2.5 is dead bang solid. But yes, the high FSB leaves less and less time for data transfers per access, so it may very well be the northbridge OR CPU that are holding me back, regardless of what memory I ever use. Going to 3,3,2.5 leaves waitstates and more "time" per access.

Also, this harkens back to the point about Vtt at the northbridge end of the memory bus, if we dont have a balanced transmission line we may be having our performance ceiling artificially limited by incorrect voltage. But a 250Mhz FSB is a 25% overclock of the northbridge's bus, it is alot to be asking.

I dont think cooling has any impact on my setup, the northbridge and CPU are well under control.....swifty barely gets warm, and the NB is lapped at 1000 grit and AS3'd. CPU stays in the 40's when being thrashed.

But people have done it....though I wonder sometimes how "stable" they are when they say it. To me stable is running all tests without error....memtest/winmemtest/prime/3D2K+03 and gaming for hours on end.

In the meantime, if you decide you dont like your 2x 512M BH5... give me a call

[bachus_anonym]

honestly, i've been playing with mu current setup for about two weeks, after vtt mod... and i'm about to retire on this hunt for 250 FSB 11-2-2 cas2 Dual STABLE
vdd 1.6-2.2v, vdimm 3.0v-3.5v, vtt 1.50-1.75v... being there and done all that... even 80mm tornado blowing on SB or NB, all Integrated with SB devices OFF...
at this point i think it's my mobile (for which i feel 244 is hell of a stretch already!) not catching up with FSB request or sth
but i see folks on my native ( Polish ) forum having 250+ FSB with 2x512MB of some Hynix43 stix at lousy 11-4-4 cas2.5. but still, that's over 250FSB on NF2...
or like u say - there's something else that needs to be modded on this board to take BH-5 / CH-5 higher at tight timmings...
i wish we knew DFI's secret to high FSB

oh, my 2x512 feels pretty comfy here and doesn't like to be separated from it's owner and 2x256 buddy... i need those for upcoming upgrade - Socket939 + FX-53 + R420

[Bugs]

Hi there,
since Vtt isn´t the secret, what should be the secret?
In my opinion the secret is in chipset... imo there are many strange things with this chipset,
-Vdd don´t have any influence on NB stability anyone can explain why, or any1 have any theoric idea to explain it?
-Many ppl have their NF7 stable at certain FSB @ agressive timmings (me for example, 243MHz @ 11-2-2-2 (7 hours memtest #5 loop) and 1 MHz more, give error on memtest after 2 minutes of test, even slowering down timmings (11-3-3-2,5) and increasing Vdimm won´t help, with this I conclude that RAM ain´t the problem and "messing around" on Vtt/Vref/Vdimm... won´t help, specially for ppl with BH-5.
-Could it be the BIOS? Really don´t know, but I start to believe it could be, due to the fact that DFI nF2 have options for other timmings besides Tras, RAS, RAStoCAS and CL and maybe this timmings are the secret.
-Maybe, like uwackme as been saying, Vtt at the northbridge end of the memory bus need to be upped aswell.
I just know that I can´t run stable more than 243 MHz and my BH-5 handle more than 243...

[uwackme]

Just a side note, I was looking at the A7N8X board and found that it sets things up....Vref drives Vtt and Vdimm circuits, so they all track. The Vdimm mod for that board actually mod's the Vref which cascades to the Vtt and Vdimm.

[STEvil]

someone should lap their nb down to the core and direct cool the core.

[tictac]

my friends can run

252MHz
2 x 256MB single side Hynix D43 Rams
2.5-4-4-11

Prime 95 ......3 hours stable...

no vdimm mod or vtt mod

seem it is something related to the bios limitation

i think the bios is not build for 2-2-2- timing as DFI Infinity bios