Radeon X800 Non-Pro/X800 XL/X850 Voltmods

[Urlyin]

I found a beauty of a card here. I only have the Vcore and Vmem at 1.65 and 2.16. On ambient water. $450 Sapphire X850xt non pe. The clocks for 05 are 714/645, and 03 is 711/654.

3DMark 05 - 8152

3DMark 03 - 17169

Go Sik ....

 

[Urlyin]

5240 u mean
And what do you mean? You say that if I measure it at all it will work?

I was trying to tell you how to get the default resistance ....

 

[Urlyin]

and im sure the odds on me stabbing my card with a pencil helping my OC are great. [/sarcasm]

we need someone with a clue to do this, urlyin?

Mussels can you verify that that the VDD and VDDQ work ... it appears Daysleeper is having issues there as well .... which he should not be, because the vmods there are on resistors .....

I've tried a couple of things and they did not work any better than the pencil .... hang in there Mussels

 

[Mussels]

i just got my ATI silencer 4 rev 2, so i'll take a crack at it tomorrow.

get him to measure his defaults, so we can compare with the ones i posted earlier.

 

[SIK_L_CELL]

I did the hard mods.

 

[Mussels]

just succesfully did the VDDQ mod from 1.90->1.97V

doing VDD and doing a few tests later tonight, but yes the pencil mod seems to work on VDDQ ( 852 ohms -> 819ohms, 2B pencil)

 

[daysleeper]

just succesfully did the VDDQ mod from 1.90->1.97V

doing VDD and doing a few tests later tonight, but yes the pencil mod seems to work on VDDQ ( 852 ohms -> 819ohms, 2B pencil)

So what is the reason to do that mod??.

 

[Mussels]

read the info in the main page for this mod, and the info for previous volt mods.

the reason i'm testing these is that some of us seem to have boards that cant mod certain things, and w1zzard doesnt have one of these boards to test with so i'm looking things up for him and urlyin.

edit: reducing resistance of the VDD DECREASES voltage. so you'd need to increase resistance, which is impossible for a pencil mod.

so urlyin, either find a new readout point, or a new pencil point... cause currently only VDDQ is pencil moddable.


edit: 2
Whats REALLY weird is that undoing the failed VDD mod (due to lower voltages) has reduced my OC!

i think its just reading the voltage wrong, and really is having an effect on OC. i'd like someone else to confirm this, i dont have the time to do it right now.

 

[W1zzard]

are you sure that penciling resistor r311 reduces vdd voltage?

one side is connected to ground and the other one to vsense+ so reducing resistance should drop the sensed voltage which means the vregulator pumps out more voltage

 

[Mussels]

using the points in the guide, the measure point did indeed lower in voltage. however, OC increased. personally i think its just that we need another measure point for VDD

 

[Urlyin]

So what is the reason to do that mod??.

Day ... it increases the memory OC ...

 

[Urlyin]

using the points in the guide, the measure point did indeed lower in voltage. however, OC increased. personally i think its just that we need another measure point for VDD

increasing the VDDQ does more for the memory OC than the VDD ... so increasing the VDDQ may be why the OC increased ...

 

[Mussels]

i raised VDDQ and VDD, then ran the rig, checked voltages. did ATItool tests for max OC and powered off. i then un-did the VDD mod beleive it to be undervolting the card, and lost OC regardless. so unless my card loves lower volts, something weird is going on.

 

[HousERaT]

Hello folks.... my card is a Rosewill X800XL card. It's one of the cheapest at Newegg.com. I'm cooling the card with an ATI Silencer 5 Rev2. My stable overclock of 425/535 gets the core up to 50° under load. What voltages would you folks suggest I use to pencil voltmod my card considering the cooler I'm using?

VGPU?
VDD?
VDDQ?

 

[Mussels]

i used an ATI4 rev 2. myself, heres my way.

remove the ram backplate for now and hold the front on with elastic bands (make sure the card still fits in teh AGP/PCI-E slot) and look closely at the pencil / volt mod points. measure and write down the stock resistance, and making 300% sure not to loosen the front part of the cooler, install the card and power up the system, get into the BIOS and just check the stock volts.

once you do that, take it out, lower VDDQ and VGPU by approx 30 ohms (or less, not over) and test again to see the voltage change.

you can do the same with VDD, but the end voltage must NOT go above the VDDQ voltage, so do it first.

and as i said earlier, if you notice VDD drop in volts, try the OC anyway. mine OC'd more regardless of the volts dropping.

 

[daysleeper]

increasing the VDDQ does more for the memory OC than the VDD ... so increasing the VDDQ may be why the OC increased ...

well i'll try to do the pencil omd for vddq add hope i can get ovet 620 for memory....

 

[Mussels]

VDDQ is the boards voltage, but VDD (ram volts) cant go above it. so raise VDDQ til you think its enough, then raise VDD, but keep the volts under VDDQ.

 

[HousERaT]

VDDQ is the boards voltage, but VDD (ram volts) cant go above it. so raise VDDQ til you think its enough, then raise VDD, but keep the volts under VDDQ.

since we're running about the same system what voltages did you end up with or did you remove the mods?

what did you gain in oc from the mods?

 

[GazC]

I don't want to sound negative, but does the pencil mod actually work with the 850? I don't want to use a soldering iron again if I can help it, after what I did to my x800.

Reading this thread does not seem to give convincing results.

 

[Mussels]

houserat: i mentioned them earlier in the thread, except VDD which didnt work anyway. (if i DIDNT mention it, i'll add it in later. had my HD corrupt and need to get my notes off it)

lower by 30 omhs for a safe start.

gazC: VDD / VDDQ seem to work, VGPU doesnt seem to. it DOES for some people, the cards differ a little.

 

[daysleeper]

VDD 2,09V
VDDQ 2,09V
i can't get these up,when i measure the resistance i can't get reading it changes all the time.Jep i have use the pencin but no change in the volts....i hate this

 

[Mussels]

make sure to measure it the same direction each time, certain resistors will only work with the black lead on one side of them, and some have a different reading if you swap the leads (black and red) around.

 

[Unregistered fire113]

Hi guys

what is the max Volt on DD&DDQ? I have an x800xl club 3d & samsung 1,6ns. Can I use the same Volt´s for it like 2,0 ns ram???---> watercooled vdd 2,1-2,45Volt and what is the max of VDDQ? is it the same like VDD???

cu fire113.

http://service.futuremark.com/compare?2k3=3867855

 

[12k^]

hmm

Anyone tryed with PowerColor x850XT / XT PE...

(x850XT Im using)

And...

VGPU / IGPU mods is the only I dare making,.. I use very poor airflow in my tower and keeps most of it aircooled... I use aluminium heatsinks for mem on gfx... and watercooling on CPU / GPU...

I'd like to go for the 1,6 - 1,65v instead of the stock ~ 1,4v...

Im able to run a speed of 605 mhz core without artifacts but freezes after a while under load... - I guess its a due to my PSU but... I'll change PSU soon...
Anyways... Im able to clock to 625mhz core but with lots of artifacts... - Daily usage the corespeed is 588mhz..

Anybody's able to help me out with the measuring points? - If pencil mod is possible...

Best regards
12k

 

[funkflix]

Works fine so far, all stock. 16000 '03 i come! ;D