9700 VREF vmem mod

**NyquistLimit** · 02-21-2003, 01:46 AM

Hi,

I've been reading up on the different vmem mods for the 9700 and it seems that the vref is set too low for a decent overclock (1.25v stock). But i havnt been able to find any definitive ways of doing this. (i have however managed to find vdd and vddq mods)

Could someone in the know post some images and indicate which chips/pins need to be modded and what strength of resistor to use? I'm sure it would help everyone out not just me

Regards,
Jon.

**Nohto** · 02-21-2003, 01:57 AM

Catch22nplay has some info about the V-ref at this site.

**NyquistLimit** · 02-21-2003, 02:49 AM

ok thanks,

can u confirm that it is the 2nd pin (from left) of the indicated chip
(green line)

or is it the 2nd resistor in the group of 3 resisters? (green circle)

**NyquistLimit** · 02-21-2003, 03:06 AM

here's the pic...

**Nohto** · 02-21-2003, 03:10 AM

Actually I don't think it is either. It is the 2nd resistor in the group of resistors, but they're not in the green circle.

**NyquistLimit** · 02-21-2003, 03:14 AM

hmm, which one is it then?

could you goto the rage3d forum link u showed me, get the first (clean) pic of the 9700 and draw onto it a pointer to the relevant resistor? that would help immensely.

Thanks,
Jon.

**Nohto** · 02-21-2003, 03:23 AM

This is the one I think it is. I sent Catch an email the other day, but haven't received a response. The resistance values match his readings and it is the only resistor in that area that it can be, but I am not 100% positive.

**NyquistLimit** · 02-21-2003, 03:29 AM

well according to this shot (a pic of catch22's card) i cant see anything connected to the resistor you or I mentioned (though the pic is kinda fuzzy)

We really need catch22 himself (or someone that has done this) to indicate the correct resistor

Regards,
Jon.

**Nohto** · 02-21-2003, 03:33 AM

You need to read the whole thread. He doesn't attach anything to the resistor, he uses the pencil trick to increase the voltage. My readings matched his statements when I tried the pencil trick, but my card refuses to behave in the ram department. I think my problem is that my 5v rail needs to be raised and I just haven't gotten around to pulling the PSU out to do it yet.

**NyquistLimit** · 02-21-2003, 03:35 AM

ahh i see,
will go and read some more then.

Thanks,
Jon.

**Nohto** · 02-21-2003, 03:39 AM

No problem, Hope you have better luck. He seems to know what he is talking about, but like I said I haven't been able to verify it yet, because my card freaks out if I just solder the wires on for the mem mod. I don't have to even attach the pot. I haven't figured this out yet and I know that I did a good job soldering, because I have done several other mods that are much more difficult and haven't had any problems. It works fine if I take the wires off but doesn't like that mod (mem) at all.

**NyquistLimit** · 02-21-2003, 03:50 AM

well i had a quick read about the pencil trick, though unlike the 8500 mod there doesnt seem to be much room around this resistor to draw a pencil trace.

I'll give it a go anyway when i get home from work.

I'm planning on doing the vcore and vref mods only to begin with. Though i really cant be bothered having to dismantle my zalman hp80 in order to get to the components

Thanks again,
Jon.

ps - heres a link to the 8500 pencil trick for anyone who wants to try this. Thought it might help.

8500 Pencil trick

Good luck.

**Nohto** · 02-21-2003, 04:11 AM

I just drew over the top of the resistor and all around the sides.

**NyquistLimit** · 02-21-2003, 04:39 AM

btw just a thought,
have u tried applying additional cooling to the heatplate at the back of the card? It gets quite hot and cooling it can help the IO components to the RAM.

If you have, did it help? I plan to try this later on too.

Regards,
Jon.

**Nohto** · 02-21-2003, 07:28 PM

I have a infrared thermometer and the temps weren't that high. So no I didn't.

**youthemandan** · 02-27-2003, 03:19 PM

On my gigabyte 9700 pro the vref is stock at 1.43. I get some sweet mem overclocks with that combined with the stock 3v setting on the ram

**WildKard** · 03-02-2003, 11:06 PM

OH MY GOD

I just did the Vref mod it took me about 2 minutes(one of which was heating up the soldering iron doh!) and man this is the BEST MOD ive done to my radeon 9700 pro! it took me from 380 mem to 407! it is 100% modded now vddq vdd vcore vref

air cooled it does 440/407.5 im going to see how much of an impact flashing with the bios setting to "synchronous clocks" because ive never tried it

one thing i find VERY interesting about this mod though is i can run at 407.5 without the slightest hint of tearing or anything but at 409.25 the next highest setting it is unbearably disasterous!

I recommend this mod to anyone who is having difficulties with their mem oc

*EDIT* btw for those wondering Nohto is correct in where to solder

**Xenogias** · 03-03-2003, 11:18 AM

hey Wilkard,

Could you tell me what exactly you soldered. Was it a 900ohm resistor on the top of Nohto's circled resistor or the bottom side? I really dont want to do a pencil trick, i would prefer soldering for an exact value. What are your vddq, vmem, and cref values now after the mod? Last question....Where do you measure vddq values?

**WildKard** · 03-03-2003, 03:48 PM

I soldered a 1k variable resistor set to 900ohm cause i coincedentally had one right beside me!

I soldered the top part of the resistor in the green square

Vref is labeled where to read it if you look up Vdd is just to the right of it

Vddq and Vgpu are to the left of the silver plate sorry no pix :|

*edit* i get 1.53 vref

**Xenogias** · 03-03-2003, 04:53 PM

WIldkard,

thanks man, this is exactly what i wanted to know. I'll just mess around with my multimeter around the silver plate to find the vddq measurement point. Its supposed to be about 2.85v stock I think. What is your vddq now? I'm gonna do the vref and vddq a little later in the week and probably order some ramsinks as well. Thanks again for the info.

**youthemandan** · 03-04-2003, 10:08 AM

What did u raise the vref too?

**Xenogias** · 03-04-2003, 01:19 PM

youthemandan

He raised it to 1.53v I think stock is something like 1.25 but I could be wrong. Catch22atplay recommends 1.495, but thats only if you get artifacting at higher. I guess if your board can take it, higher is better.

**bowman1964** · 03-04-2003, 01:54 PM

well guys this mod work for some not on others so be carefull.

my raddy was stock.ati brand 9700 pro revision 3.0
vcore 1.51v
vdd 2.92v
vddq 2.85v
vref 1.425

i bummped my vcore to 1.92v
vdd to 3.05c
vddq on mine no setting helps my memory.but i have had it to 3.25v
vref well another waste for me i have adjusted up to 1.55v and no differance.

but the increase of the vcore got me to 489core and the increase of vdd to 3.05 helped get rid of some artifacts,maybe a 3mhz increase there.

man would be nice if my card to go 390 mem but i am still looking for ansers

**Xenogias** · 03-05-2003, 07:22 PM

I'd still like to know where the vddq measurement point is, anybody know?

**bowman1964** · 03-06-2003, 05:12 AM

well if no one posts a picture by tonight i have some close up pic's showing excate measuring points at home.

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