8RDA/+ memory mod?

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04-09-2003, 12:38 AM
gtcrispy

its from mbm5.3 and the bios.
08-01-2003, 06:46 PM
lght1

Hi

*bump*

Just a refresher question concerning these 8RDA's rev1.1,

Does it make sense to vdimm mod this board, ot just jump ship to a NF7 2.0 ?
08-14-2003, 11:38 AM
OC&Burn

Quote:

Originally posted by bowman1964
well it doesnt do anything for showing correct vdimm in softwear.
it just stablizes the memory more like it should be.i can tell a differance under load.before mine used to drop from 3.05v while running 3d2001.( i keep a volt meter attached the the mofsets while benching) would drop from 3.05 to 2.96 or so.now it holds within a few points.3.05 -3.03.
but you wont tell this unless you have the system pushed hard.
:D

Ok, I haven't read the whole thread but tell me if im wrong. I you do a simple Vdimm mod without cutting or soldering. Just using grabbers and a pot, you _will_ get higher Vdimm, but it will not be as stable as it would be if you raise the VBT too? You will get a voltage drop? Anyway, if that's all, a voltagedrop to 2.96 is good for me, it's alot better then 2.83 that im getting now with my 8RDA3+ and 2.9Vdimm in BIOS.
08-14-2003, 07:26 PM
lght1

Hi

I've already finished both the vdmm and vbt mod. With a few turns of two screws, I have all the way up to 3.2v :eek:

However, I am not able to test it out as I sold my crappy GEIL PC3200 DC Ultra. This ram wouldnt o'c hardly at all regardless of how relaxed the timings were, or how high the voltage.

I'll likely send for some TwinMOss next week.

Still, although I've had this 8RDA r1.1 since Feb, I still like it a lot.

I've given a NF7 2.0 some consideration, but I may keep this beauty.
08-24-2003, 08:18 AM
OC&Burn

Quote:

Originally posted by lght1
Hi

I've already finished both the vdmm and vbt mod. With a few turns of two screws, I have all the way up to 3.2v :eek:

However, I am not able to test it out as I sold my crappy GEIL PC3200 DC Ultra. This ram wouldnt o'c hardly at all regardless of how relaxed the timings were, or how high the voltage.

I'll likely send for some TwinMOss next week.

Still, although I've had this 8RDA r1.1 since Feb, I still like it a lot.

I've given a NF7 2.0 some consideration, but I may keep this beauty.

i see your using the Vdimm mod. Is my question above your reply correct? Can I use just the Vdimm mod to raise the Vdimm, BUT it will drop some under load? I don't want to destroy the board with the vbt mod (seems a bit hard for me....) but I need higher Vdimm.
08-24-2003, 09:32 AM
lght1

Hi

I would recommend both mods, as the loss of vtg stability could possible cause overclocking to be affected as well as some intense 3d apps.

In my case, the 1.1 I spoke of earlier, died last week along with a 9500 Pro . It was a power supply that caused such devastation.

I am now on a v2.1 8RDA+ which will do 230 without any mods other than adding active cooling to the nb.

Rather than taking a chance on wrecking a perfectly good older NF2, I'd go for the Ultra 400 versions out now. I wished I 'd have done that, then I'd have another NF2 to upgrade the other pc in the house with.:doh:

BTW, My 2.1 actually provides a real 2.9v to dimms. However, it tends to undervolt the cpu, so I just set it higher for the same vcore as before. The vdd needed to do 230 is 1.8, as opposed to the 1.92 for 220 on the v. 1.1 .
08-24-2003, 01:01 PM
OC&Burn

Quote:

Originally posted by lght1
Hi

I would recommend both mods, as the loss of vtg stability could possible cause overclocking to be affected as well as some intense 3d apps.

In my case, the 1.1 I spoke of earlier, died last week along with a 9500 Pro . It was a power supply that caused such devastation.

I am now on a v2.1 8RDA+ which will do 230 without any mods other than adding active cooling to the nb.

Rather than taking a chance on wrecking a perfectly good older NF2, I'd go for the Ultra 400 versions out now. I wished I 'd have done that, then I'd have another NF2 to upgrade the other pc in the house with.:doh:

BTW, My 2.1 actually provides a real 2.9v to dimms. However, it tends to undervolt the cpu, so I just set it higher for the same vcore as before. The vdd needed to do 230 is 1.8, as opposed to the 1.92 for 220 on the v. 1.1 .

okie, but I think im just going to do the Vdimm mod, don't wanna ruin the board because of my soldering skills ;)

Do you have a picture of a Vdimm mod?
08-24-2003, 05:06 PM
lght1

HI

I would recommend both, as one isnt any more or less difficult then the other.

Here is a good link with pics and a step by step guide.

http://www.motherboardfaqs.com/article.php?35.255
08-25-2003, 11:06 PM
q149

Here is a crappy pic of one of my Vdimm mods on an 8rda+ 2.0..

http://q149.netfirms.com/cgi-bin/8rd4.cgi
09-01-2003, 08:25 PM
STEvil

You're right, that is crappy! 8-)

EDIT

Has anyone tried running 3 sticks of ram before and after the mod?

EDIT 2

What would happen if we only did the VBT mod?
09-02-2003, 04:24 AM
lght1

Hi

All the vbt does is stabilize the current voltage setting. Without the vdmm mod to go with it, there shouldnt be any need.
09-02-2003, 08:50 PM
STEvil

Yes, but what would happen if it were adjusted slighlty high or low? Could it possibly play a trick on the vdimm?
09-02-2003, 10:13 PM
lght1

Hi

Perhaps I misunderstood.

I thought that you were only going to do the vbt. If that is the case, it wouldnt mean anything as the mobo should not needed it if stock bios settings are used.

VBT settings are exactly half of what the dimm voltage is set for. The mobo does this itself with factory settings. Its only when we exceed the factory specs that this vbt mod is necessary.
09-03-2003, 06:55 PM
STEvil

What I am wondering now is if there is a way to disconnect the vdimm and just loop it back to the IC, and run an extra wire right from the 3.3v line on the PSU through a couple caps or something and into where the old vdimm line was going... or through the existing circuitry even.
09-15-2003, 01:16 AM
STEvil

Anyone know of a 1.6v source on the board?

If you connected a wire from a 1.6v source on the board to the BTsen pin you would be able to skip the Vbt mod.. may have to lift the pin, though... or cut the trace to it?...

http://www.vr-zone.com/guides/EPoX/8RDA+/VDDR-1.png

Wish I could figure out what pins 1 5 and 24 do as this IC is supposed to be able to overvolt up to .4v over, but gives no documentation in its PDF's on how exactly it does that in stock configuration....

http://www.winbond.com/e-winbondhtm/....asp?Pname=866
09-19-2003, 10:06 PM
STEvil

ok, after extensive searching I have found some resistors that give me 83.2 ohms when soldered in series...

Going back to Mickey's post that he used a 72-76ohm resistance for 3.1v @ 2.9v, would this resistance give me close to 3.2v..?

http://www.xtremesystems.org/forums/...087#post117087

UPDATE

Did the mod, with an 80ohm resistance I am getting 3.0v @ stock settings. Tad high, but oh well.
10-16-2003, 11:41 AM
DragonFlight

I am ready for the Vdimm mod on my 8RDA3+. I will do the Vdimm first and if i have any problems i will do the Vbt also!
Now i have a question: Did anyone tried this mod succesfully on 8RDA3+(NOT 8RDA/+).
11-07-2003, 11:55 AM
Rub87

Quote:

Originally posted by Zoom Proof
Hi guys :)

Can someone tell me , where i can get proper vddr and vbt
with multimetr ? I'll be very glad to see some pics where
these points are selected.

ps sorry , but my english as not good as i want and
it's so difficult to me to read all these posts :(

Here

pic1 of my mod
pic2 of my mod
11-12-2003, 04:05 PM
Swiftech

Ok, I'm pretty confused here. You cut the PCB hard enough until there are no circuit running ?

I've seen another method which is lifting up the leg of the IC. However, do we always need to perform the Vbt mod ?
11-12-2003, 07:29 PM
STEvil

i havent done the vbt yet... my voltage is sitting pretty stable it seems (watched it for a few runs of 3dmark, didnt dip farter thane 3.17).

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