ATI 4850/4870 voltmod thread

[mister]

.. dont know if its the right thread...
but this app should interrest everyone who is able to read german.
http://www.awardfabrik.de/forum/showthread.php?t=5707

its not permanent -> after reboot the voltage is still @ default.
happy testing
ciao

[les_paulde]

.. dont know if its the right thread...
but this app should interrest everyone who is able to read german.
http://www.awardfabrik.de/forum/showthread.php?t=5707

its not permanent -> after reboot the voltage is still @ default.
happy testing
ciao

Thats a pretty nifty tool imma have to admit! Is it not limited to the same limits as modding the Bios though? If not, then this would really be an ideal piece of code for pushing those GPUs!

[mister]

Thats a pretty nifty tool imma have to admit! Is it not limited to the same limits as modding the Bios though? If not, then this would really be an ideal piece of code for pushing those GPUs!

NO limit ! u can push GPU Voltage up to 1,99V

maxibition says that in post #163 ...

no doubt that cant be healthy

but a member testet sucessfully 1,3v on a 4870 @888mhz gpu score
see link below
http://www.forum-3dcenter.org/vbulle...01&postcount=4

[les_paulde]

I personally wouldn't mind seeing a picture of a DMM showing the coinciding voltage with whats set in the program though, sorry to be skeptical. It's just that I trust a DMM more than any software monitoring tools, especially at the higher ranges... Wasn't 1.3v still within BIOS range on the HD4870 anyways?

Nice find though man, I'm sure a lot of people will want to try this out!

[mister]

software isnt exact at all..
and to be skeptical is much better then skrew up your cards
nothing beats a professional mm - no doubt.

i even read a post that this mod wont fit with 4850s cause they are not equiped with digital mosfets !
so if your gfx got uP6201BQ voltage Regulators... forgot it.

back to the 4870s - another poster got sucessfully 920 mhz core clock , but i dont know the voltage.
reaad post #37

Sapphire HD4870 512MB Ref. Layout
Programm > Multimeter
1.25 > 1.258
1.30 > 1.309
1.35 > 1.360
1.40 > 1.411
1.45 > 1.463 double

[Mean Machine]

770MHz at 1.26V is... Impressive. I'm having a hard time getting 790MHz at 1.42V with my dual slot Sapphire. Oh, and yes, I managed to mod it successfully.

EDIT: Seems it just goes on and on ever since I got above 1.4V, 815MHz seems fine so far. Just testing though, the only requirement is 3DMark06.

[gurusan]

Just got my 1GB HIS card under water and got one of those Zalman VRM coolers. It works VERY well, VRM load temps around 50ish and idle 30C!

A bit annoyed that this card has crappy Hynix memory. Which manufacturers use better stuff?

[Mean Machine]

I'm not exactly sure, but isn't Qimonda the best GDDR5?

Seems the blue Sapphire 4850 is utter crap, I could do 800MHz flat, but 830 didn't work no matter what I fed it with (which was up to 1.58V under a accelero twin turbo). Yes, I'm aware that those kinds of voltages are prone to kill the hardware, but I just wasn't bothered with keeping it alive.

My reference (old) Sapphire 4850 is better though, running 3DM06 at 800MHz with 1.3V right now (just thought I'd start there, haven't tried any less voltage).

[gurusan]

I had a blue 512mb Sapphire once with the analogue vrm circuit and it did 850mhz stock voltage under water....my red Sapphire with digital voltage reg circuit did 875mhz stock voltage though....not found another 4870 that clocks nearly as well

[tool_462]

Just thought I'd add my results in here. (By the way, that Awardfabrik program does NOT work on ALL 4850s)

I have a pair of Asus 4850's that come up in GPU-z as "Prerelease" which I don't know why this is the case, but they are pretty early cards I guess.

Testing each one individually, aircooled with Thermaltake DuOrb.

Vgpu under load is 1.29v, my max 3d06 runs last night were at 875 on both cards with the same 1.29v.

Max in 3d01 Nature (my quick "does it bench" test) was 900 core on one card, and 895 on the other. I was surprised when I read the voltage (with a DMM) and kept cranking the core up 25mhz at a time and it just kept staying stable! Fun cards

http://www.techpowerup.com/gpuz/6zpv3/

[Oese]

Hey there,

i got this card yesterday:

http://www.abload.de/image.php?img=dsc02565uall.jpg

i think its a rev 2 pcs+. But the vgpu measure points that were posted here do not apply to me somehow. If looking on the back of the card, i have 1,3v reading on the right points to ground, on the left points as stated in this post

http://www.xtremesystems.org/forums/...postcount=1317

i do not get any readouts...

now my pronlem is: unfortunately, voltages do not alter in powerplay mode (if i measure on the right hand points), nor can i adjust them in bios. Someone has experience with this card? Its a powercolor 4870 pcs+ 1GB, obviously with analoque pwm section...

[les_paulde]

Hahahaha, I love these HD4850s! Managed to push them both to 880/1050 last night (1,48v), and now have the highest scoring 2x HD4850 CF system on HWBot with 3DMark Vantage:

http://hwbot.org/result.do?resultId=825097

This gives me a nice 3rd place on the overall rankings and the first two users have 3 and 4 HD4850s respectively so makes sense I guess!

Whats the limit people have been pushing these cards on Vcore for benching purposes? My EK waterblocks are keeping both cards under 50C load (gpu, mem and mosfets!) so temperature shouldnt be an issue...
Thanks!

[Dafut]

Since uPI Semi so inconveniently pulled the data sheet and detailed specs for the uP6206 from their site, I was forced to make an educated guess at the location of the FB pin. AFAIK, I'm the only one who has tried this mod but the card has been running at 1.35v for a few days now without issues.

For the uninitiated, make sure to first set your VR to its highest resistance before adjusting it down to the desired level while monitoring the voltage. You do not want to start with the VR set to zero ohms.

Disclaimer: Using this mod will void your video card warranty and you alone shall be liable for any resulting damages. PERFORM THIS MOD AT YOUR OWN RISK AND DON'T TRY THIS IF YOU CAN'T AFFORD TO LOSE THE CARD!

*large image*
click

*large image*
click

Just tried this mod on my card, voltage goes up to 1.365V (stock was 1,33). But it won't go any higher, adjusting the value of the VR has no effect at all. Do you have the same problem or are you able go higher?

[syl]

Just tried this mod on my card, voltage goes up to 1.365V (stock was 1,33). But it won't go any higher, adjusting the value of the VR has no effect at all. Do you have the same problem or are you able go higher?

I'm max'ed out at about 1.37V as well. To go higher, you will probably need to change the VID limit by switching the positions of the VID resistors.

[benko]

will i with pencil mode raise mvddq and mvddc(at least that is shown with picture at techpowerup)?
so if i all get it clear i need to reduce resistance of r713 and r913 versistor??
stock resistance(i measured with DMM) is 220ohm each, for how much i need to reduce it??

i will pencilmod 4870

[fng77]

I'm not exactly sure, but isn't Qimonda the best GDDR5?

Seems the blue Sapphire 4850 is utter crap, I could do 800MHz flat, but 830 didn't work no matter what I fed it with (which was up to 1.58V under a accelero twin turbo). Yes, I'm aware that those kinds of voltages are prone to kill the hardware, but I just wasn't bothered with keeping it alive.

My reference (old) Sapphire 4850 is better though, running 3DM06 at 800MHz with 1.3V right now (just thought I'd start there, haven't tried any less voltage).

Same here. Sapphire Dualslot 4850. Cant get over 800 Mhz regardless of v-core. That sucks!! I wonder if they have locked it somehow? Or maybe they are just to crappy to handle higher speeds?

Anyone who managed to get past 800 with these?

[Vatos_locos]

i need some help brothers :p

i understand VDDC for the 4870 is the Vgpu mod
and MVDDC is for the Vmem mod
but what about the MVDDQ ? i cant find out what it dose :p
and i really want to know.. i'am waiting one sapphire 4870 tomorrow an when i will fined the max clocks on stock voltage i'am going to mod it so i need to know what the MVDDQ stands for...

thanks :p

[roger_h99.nor]

MVDDQ (VDDQ) is the 'chipset voltage' of a GPU (as compared to a motherboard).

Some claims that raising this improves the OC of both the core and the memory. Vddq had to be raised together with the Vddc to have any effect. Vddq was a 'big thing' back in the 9800 pro/xt days. Haven't seen it used since then. It had only a slight impact even on the 9800 cards.

Don't bother, I managed to kill two 9800 cards - both likely by playing with the vddq.

[$0m#0n#]

What do you guys consider as safe vcore on air? Accelero + 14cm fan (1000rpm), max temps 62 all "cores", just core / memory IO is 72C while running 3D06. Got my 4850@1.35V - pencil moded

[largon]

MVDDQ (VDDQ) is the 'chipset voltage' of a GPU (as compared to a motherboard).

Some claims that raising this improves the OC of both the core and the memory.

vDDQ is the operating voltage of the memory IC's I/O buffer, basically the voltage the memory bus works on. And as such it also affects the GPU.

mvDDC is the voltage the memory cell runs at.

[...mat...]

hello. sorry for my bad english but I'm italian.

I've seen that someone has overvolted the sapphire dual slot 512MB. Have you a guide or other for this card?
isn't the pcb different from the one in the image at the beginning of the post?

thank you,

Mat

[Mean Machine]

I've sold my card, and I can't remember exactly which point is the mod point,but two of the points next to each other in the red area are the same point, and that's the mod point. 100k VR to GND worked just fine, even though the card isn't worth modding imho.

[headman800]

i'm looking for powercolor/club3d eadeon 4830 vmod(pensil or soft)
thanks

[...mat...]

I've sold my card, and I can't remember exactly which point is the mod point,but two of the points next to each other in the red area are the same point, and that's the mod point. 100k VR to GND worked just fine, even though the card isn't worth modding imho.

thank you... do you remember something about the vmem incresing?
i've founded this in old pages, but the user wasn't sure:


and what about the vmem measure points?

[Mean Machine]

I didn't care about VMEM, so I can't say much about it.