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Yup that's the correct points.
Whilst my 9700pro was still alive
:frag:
I played around a bit and found that from a stock voltage of 2.9v for Vmem, a 6,800ohm resistor would give me 3.1v and a 2,700ohm resitor would give me 3.2v.
For Vref from a stock voltage of 1.4v, a 39,000ohm give 1.41v, 27,000ohm 1.42v and 22,000ohm 1.43v
I wouldn't try the Vddq, tried it a couple of times, never with any success, the second time was fatal.
The problem i've noticed with raising VDDQ is an increase in heat for the gpu. I checked it and VDDQ does actually go into the gpu itself. So i can understand why there is an increase in heat. So some people aren't having much sucess raising VDDQ. Take care of the heat and VDDQ may work better for you. Then again maybe not. Just gotta play with it and find a happy setting for all the mods. Damn this info below is old.
Yup that's correct.Quote:
Originally posted by DBurton
My card looks like this:
http://thecrucible.ca/images/old_mem.jpg
Can anyone confirm that this the vmod in this picture is correct? Also, is there a list anywhere of the different levels of resistance and the resulting voltage of them? I would prefer to use fixed resistors :) .
DBurton
BTW i have no problems using a mini grabber on the ISL6522 chip. But mine are a lot smaller than the ones you guys are using.
Smaller than the mini ones at frys CATCH?Quote:
Originally posted by CATCH22ATPLAY
BTW i have no problems using a mini grabber on the ISL6522 chip. But mine are a lot smaller than the ones you guys are using.
Nope not smaller than that. Those are the ones i use. I put a 135 degree bend on em. I hope we're talking about the extra extra small ones here. Damned expensive imo but well worth it. Sometimes the fit is a bit tight. But they jam in after a little bit of coersion. :cool:Quote:
Originally posted by Nomjr
Smaller than the mini ones at frys CATCH?
Yeah the mini expensive ones:eek: Amazing they get that much for them, more than the larger ones in fact:slobber: Thanks CATCH!
Nomjr, Ah another SoCal dude. SanDiego area myself. To be more precise Vista. But grew up in Escondido. Seems to be quite a few of us SoCal dudes around modding comp stuff and following theese threads. Tried that dryice and my R9800@580/420. It was looking sweet until cpu freaked out on me. ARG!!! I give up for now. I think i'll improve upon my volt mods and see if i can get 600 core.
BTW after experimenting a bit here's the math i've come up with for Vref voltage. I got no idea why it has to be this way. But it's very consistant with my cards. First we know according to data sheets Vref must be 1/2 of VDDQ. But that isn't good enough. We always had to play with it to get it working correctly. Here's what i came up with. Raise your VDDQ to whatever you like. I suggest 2.80 to start. Now divide by 2=1.40 volts. Now here's the trick. Add 0.075 minimum to 0.10 maximum to it. So set Vref to between 1.475 to 1.500. Use the same math for 2.825 aka set Vref from 1.4875 to 1.5125. For 2.85 set Vref to 1.500 to 1.525. Personally what works best for me is dividing VDDQ by 2 then adding 0.080 to 0.085. I never set Vref above 1.510 btw. I've had a few problems trying above 1.510. Anyways i hope the math helps someone. My apologies for never writing all this down way back when i first starting making volt mods and threads about this Vref thing aka R8500 days. I hope it helps someone now. Good luck dudes :)
Yup CATCH, from Los Angeles now but grew up in Chula Vista/ National City area. Miss San Diego alot, great great weather. And yes, I try to keep up with "your" threads when it comes to v-moddin cards;) I just ordered a 9800pro that should be here like early next week. Going to do the gpu vmod first and see how far that goes. What should I be shooting for as far as core and at what voltage? I'm on chilled water btw.
My 9700pro does 425 so far at 1.6v. Adding more volts doesn't seem to get me any higher. Can't touch the mem for some reason, anything over stock and I get lockups, might be a volt thing eh?
well, what system you have, spec?, amd or p4?, psu ?Quote:
Originally posted by Nomjr
Yup CATCH, from Los Angeles now but grew up in Chula Vista/ National City area. Miss San Diego alot, great great weather. And yes, I try to keep up with "your" threads when it comes to v-moddin cards;) I just ordered a 9800pro that should be here like early next week. Going to do the gpu vmod first and see how far that goes. What should I be shooting for as far as core and at what voltage? I'm on chilled water btw.
My 9700pro does 425 so far at 1.6v. Adding more volts doesn't seem to get me any higher. Can't touch the mem for some reason, anything over stock and I get lockups, might be a volt thing eh?
on an amd system 2400+, a7n8x, 8rda, 2*wd 80g, 2*cd-rom, r9700,
I try three different psu supplys enermax 350w, sparkle 400w, antec 425w and they are gave me different overclock, I setle for the sparkle 400w because I could adjust the voltage, I found about this when I was overclocking and with a cheap pci video card, I could get nice overclocks, but as soon as a put the r9700 in the system my system memory whould give me errors :(,
If I up the voltage on the gpu, the memory would perform worst and worst,
what to do
put your system stock, take the mod off of the gpu and work just with the memory, when you get the highest overclock possible, work with the gpu and if the memory performs less than before a new psu will be needed:eek:
good luck, and also something to consider, will the extra money on the psu will be worth the extra overclock?
on the r9800 start with the memory first, and work from then, with chilled water and some voltage + some luck, you will be able to hit 450-500/350-400, but its all about luck, and I wish you some:toast:
That's hard to say. Since i've had about 5 or 6 of theese R9800's now i've found stock volts to be quite a bit different. The lower core voltage ones aka 1.60 volts O/Ced the highest after volt modding em compared to the 1.70+ default ones. For the ddr i'm doing about the same as i was with my R9700. Although changing VDDQ doesn't help it seems either raising it or lowering it. Raising Vref helps a bit to get rid of the artifacts like black tree limbs in nature 3dmark2k1se etc. raising VDD up to 3.6v does help. Although i've only done that a few times. Highest i can run core is 2.025 volts with below zero cooling. 1.925 for WB with say 10C water or so. Each of my cards seemed to run the same voltage wise.Quote:
Originally posted by Nomjr
Yup CATCH, from Los Angeles now but grew up in Chula Vista/ National City area. Miss San Diego alot, great great weather. And yes, I try to keep up with "your" threads when it comes to v-moddin cards;) I just ordered a 9800pro that should be here like early next week. Going to do the gpu vmod first and see how far that goes. What should I be shooting for as far as core and at what voltage? I'm on chilled water btw.
My 9700pro does 425 so far at 1.6v. Adding more volts doesn't seem to get me any higher. Can't touch the mem for some reason, anything over stock and I get lockups, might be a volt thing eh?
But to answer your question more directly you need to get a card that does 450-470 completely stock aka right out of the box. My first 3 R9800's couldn't even beat my R9700 core O/C and that was after volt and cooling mods. So i say if it doesn't do that return it and get your money back. Then e-mail me and i'll sell you one of mine that'll do 460 stock :) 82F ambient conditions btw for my stock tests.
I have a 9700pro doing a max of 411 now in Dragothic, at 1.7v, cooled by a retail amd heatsink.
my volts are as follows:
1.7 vgpu, 2.86 vddq, 1.46 vref, and 3.15vdd
should i raise my vref to 1.5 to work with your equation Catch? and what Ohm resistor should i use?
also, what's a max voltage for memory? 3.5v?
Strang_Man i find it's easiest running Nature in 3dmark2k1se for testing core and mem. If you see white dots in Nature you need to increase VDD. If you get what look like logs or trees on the screen you have to either lower or raise VDDQ and or Vref. If you get checkerboard pattern it's Vref way to damn low. Core can also cause trees as well. So test mem with your core set 40mhz below max you can run it. I can't remember what resistance i use because i use a vario resistor for all my mods. I normally use 5k ohm and 10k ohm varios. My math for Vref works for me. But like always each card is a bit different. Remember it's not just the volts you have to factor in. V(volts) X I(current) = watts for DC. It's total watts not being the same for all of theese cards even if we set our voltages the same that makes all our cards different. I aka current is what's really messing up our equation. I can usually get higher current because i set my 12v and 5v and 3.3 rails quite high. Plus i have a $325.00 PSU. I also run wires directly from my psu to my vid card. I also do from 5 to 8 volt mods to a card. My R9700 before i killed it checking voltages for someone at another forum was doing 420 mem. That card had about 10 volt mods on it and looked like it could never run period. But damn it was sweet. For a card that only could do 346 mem when i first got it i was pissed at first. 4 months later after so many mods it rocked!
Here's some tested volts for VDDQ and Vref that worked perfect for me at least. BTW VDD was set at 3.4 and core at 1.830.
2.75/1.45
2.775/1.46
2.80/1.48
2.825/1.50
Doesn't seem to work on the R9800. But for the R9700 it does. If i were you i'd lower VDDQ to 2.825 and raise Vref to 1.50 and raise VDD to say 3.225 or so. See what that gets you and good luck :)
thanks for the response!
you use 10k ohm vr on vref and vddq? i cannot find anything higher around here..
I'm using a 10k vr on my vref(Sapphire9500 Inf3.3), and at it's max ohm setting of 9.57 it gave a vref voltage of 1.309v. Up from the factory 1.255v. Vref has done nothing for the memory overclock, and caused artifacts(colored) above 1.365. Max tested VDD is 3.32v. Getting a little too toasty.
So it seem's VDDQ is not doing anything either per Catch? I though VDDQ was memory related, btu Catch say's it goes to the core.
EDIT: OK, Verf does work. Just took some time to work it all out. 330mhz stable now;)
G H Z
quick question as i'll be doing vref and vddq this weekend... is having vref or vddq too low "bad for the card??"
cause i'd like to start low, and go higher finding what i need..
No it's not. In fact many people never do those mod's at all. They are pretty much reserved for those looking to grab the absolute highest clock's.
G H Z
I'd have to disagree with you there. The whole reason i started doing the Vref mod was because of that R8500 with 128mb Infineon ddr. Quite a few people i know fried thier cards. Some when they O/Ced em and some running at stock. I was O/Cing mine and it would completely freak out and the only way to get a clean screen was to reboot. All it took was 2 to 5 minutes running the card with the freaked out screen to fry it. Well i wanted to fix this bad engineering by ATI. So i found the the problem. Vref was too low. ATI i bet had thousands of those R8500's returned just because of that Vref issue. Now i try to use it on all my cards and mobo as well. Sometimes it doesn't help. Sometimes it saves the card :)
Catch, what voltage do you think i should begin testing my vref and vddq's at??
right now, i can do 459/351 with 1.8v on gpu and 3.14v on memory with a swiftech mcw50-t
I believe i answered that about 4 replies ago. Just use my math in that reply. Out of almost 10 cards my math worked perfect for all of em. If you use the math you won't fry the card. However if you don't follow the math you might. As in the case with the R8500 ie Vref too low. But Vref too high is just as bad. Then again there is a lot more to it then just getting the volts correct. Since thier resistors and jfets and capacitors and inductors and damn near every part is + or - 5 to 10% your ddr may not go over 365 period. I've had a couple cards that even with volt mods just wouldn't do jack. It's still hit and miss. I got lucky with all my R9700's. But the first 4 or 5 R9800's i got couldn't get close to my R9700 O/C even after modding em.Quote:
Originally posted by Stang_Man
Catch, what voltage do you think i should begin testing my vref and vddq's at??
right now, i can do 459/351 with 1.8v on gpu and 3.14v on memory with a swiftech mcw50-t
BTW i've never fried a card from volt mods and that's running ddr at up to 4.2 volts. I fried a R8500 once. But like i said ATI was to blame there and i fixed it for future R8500's. I also fried a R9700 testing voltages live. Damn my shaky fingers and too much coffee. Hmm burned up a 3dfxV4500 because heatsink fell off the core. Out of say 40 vid cards i've owned and i've volt modded all of em those were the only ones that died. I make sure to cool off the core and check the ram and add ramsinks if needed. I usually run my voltages or at least try it at way higher volts than almost anyone has balls to try. 2.25 for core doesn't work too well on a R9800 btw :)
You got a great core o/c btw dude. Your card is smacking some R9800 arse. Try volt modding that ddr and wtf happens. You may get lucky. I didn't mean to confuse anyone when i said vddq goes to core. From what i can determine the R350 core uses 3 different voltages. Main core voltage ie Vcore (the one we mod) and what looks to be a secondary core voltage of what i mod to run at 1.80. That's a completely different mod and i don't think anyone does that except me. If it proved beneficial i'd try explaining it and showing what it does like i did for Vref. But i think i found a sweet spot and i keep it there. As you can tell i mod everything if it needs it or not. Here's where it gets tricky. WHat's wierd is if you check voltages around the core you find Vcore and that seondary core voltage and vddq. All i meant by saying vddq goes to core is that communication from the ddr to the core is via vddq. I'd have to read more about communication between components to figure this out exactly. If someones got a good answer i'm all ears and always eager to learn every second of every day. :) I already know or at least think i know what the secondary voltages on a P4 and P3 are AGTL and AGTL+. Gotta read up on SSTL and SSTL2 for sdr and ddr now. So many different ways to communicate i'm a bit confused atm.
Oops rambling a bit. One too many beers maybe. hehe