ATI 4850/4870 voltmod thread

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09-30-2009, 05:38 PM
drizzt5

I did the pencil mod once again after a long break (I was using a vmodded 8800gt for a while).
http://i37.tinypic.com/2iia1xk.jpg
My temps appear good... Nothing on the 4850 itself goes above 49C's according to GPU-z and the voltage at this moment in time is 1.356 I believe using the first pencil mod. Right now I can clock the core between 820-850 it appears. I am moving it up 10mhz slowly so I will have a solid number soon.

My question is how high should I go with voltage? I would prefer not to kill the card ;) but I am interested in 900 on the core.... even if it is only for benchmarks (but if I can game with it even better!). I am going to do the 2nd pencil mod pretty soon :D

I'm at 840mhz right now stable. I've been testing with a few races of GRID :P
nvm, 830 is the highest with current voltage.
10-06-2009, 09:44 AM
JULO

That's my first post, so I say Hello to everybody ;)

I've done soldering vmod using W1zzard's method.
Here are the results:

http://www.otofotki.pl/img11/obrazki/uw7240_2.jpg

http://www.otofotki.pl/img11/obrazki/zv2997_3.jpg

http://www.otofotki.pl/img11/obrazki/ky50_4.jpg

http://www.otofotki.pl/img11/obrazki/tx1465_6.jpg

and after suggestions from fellows from my home forum, I've added a cable ended with a crocodile to measure vcore

http://www.otofotki.pl/img11/obrazki...6_PICT0003.JPG

http://www.otofotki.pl/img11/obrazki...7_PICT0005.JPG

http://www.techpowerup.com/gpuz/cfeyc/
that's 940mhz @ 1.35V , at stock voltage this card did 710mhz

Does anyone know how to go through Riva Tuner's 940mhz limit?
10-06-2009, 10:17 AM
ceemic

JULO, this single-turn potentiometer is very bad choice. It's too unstable and slightest movement equals dangerous Vgpu jump. You should replace it with multiturn trim-pot.
Also the Vmod soldering points should be secured with hot-glue or electrical tape etc.

But otherwise good job.
10-06-2009, 11:42 AM
JULO

Ok, thanks

Vgpu jump doesn't bother me.
But if it is unstable I'll replace it for sure.
10-08-2009, 10:33 AM
CL3P20

A few shots of some reference 4850's I completed for a friend...still on air atm [he is waiting on water badly :D]

Reference Diamond 4850's: completed GPUv and vDDQ + 3x GPUv output caps and 1x vMEM output cap
http://i265.photobucket.com/albums/i...s/P1050883.jpg
http://i265.photobucket.com/albums/i...P1050882-1.jpg

Vantage run on stock cooling:
http://i265.photobucket.com/albums/i...ics/P11924.jpg

..and a few of my green PCB Diamonds...and '06 run in Xfire

Non-reference PCB, Diamond 4850's: GPUv and 3x GPUv output caps
http://i265.photobucket.com/albums/i...0_modcans5.jpg
http://i265.photobucket.com/albums/i...0_modcans2.jpg
http://i265.photobucket.com/albums/i...850s_e8400.jpg
10-08-2009, 02:43 PM
Oese

nice work :)
10-11-2009, 10:26 AM
drizzt5

Quote:

Originally Posted by JULO

that's 940mhz @ 1.35V

:eek:
gj:up:

Could you take it over 1000?
10-16-2009, 12:04 AM
eKo_

Good day!
Whether and it is impossible to unblock somehow ROP on videocard PowerColor 4730 PCS?
Sorry for my bad english (
10-16-2009, 02:38 AM
Theorw

Quote:

Originally Posted by eKo_

Good day!
Whether and it is impossible to unblock somehow ROP on videocard PowerColor 4730 PCS?
Sorry for my bad english (

No!
10-16-2009, 04:50 AM
eKo_

Quote:

Originally Posted by Theorw

No!

It`s bad... Thank`s for the answer
10-16-2009, 05:19 AM
|Oc|REvO_HsArC

Here's something strange.

My 4870x2 will show artifacts at 850mhz with Vgpu above 1.30v

But its clean and stable with vgpu at 1.29v. But it wont clock higher than 850mhz because vgpu isn't enough. Its watercooled. Temps don't go above 45º.

any thoughts?
10-16-2009, 06:36 AM
Theorw

Quote:

Originally Posted by |Oc|REvO_HsArC

Here's something strange.

My 4870x2 will show artifacts at 850mhz with Vgpu above 1.30v

But its clean and stable with vgpu at 1.29v. But it wont clock higher than 850mhz because vgpu isn't enough. Its watercooled. Temps don't go above 45º.

any thoughts?

Well it seems thats your card OC potential!
100mhz more on a double chip card isnt a little you know!Also the volts are quite increased!
10-16-2009, 06:57 AM
|Oc|REvO_HsArC

yeah although I never experienced artifacts due to just higher voltage. Usually artifacts means you don't have enough voltage for a given speed/temperature.

I can do 850mhz 1.29v but not with 1.3xv

weird
10-16-2009, 12:23 PM
Theorw

Quote:

Originally Posted by |Oc|REvO_HsArC

yeah although I never experienced artifacts due to just higher voltage. Usually artifacts means you don't have enough voltage for a given speed/temperature.

I can do 850mhz 1.29v but not with 1.3xv

weird

Well @1,3x volts your VRMs might be hitting their limits and providing less that 1,29 so there u go!U dont have enough current...
At any rate,the VRMs are not designed for 1,3volts so consider yourself lucky for 1,29 and 850mhz!:up:

I had some issued too with my 4850.it could do 830 core @1,32 but @1,39-1,40 it would artifact the hell!!!!!!!In the same speed!
So its not uncommon!
10-27-2009, 08:49 PM
MetalX

Anyone perform these volt mods on an Asus EAH4870 1GB? My PCB looks different than the one pictured. I'm still looking through the thread to see if this card has been mentioned.
10-29-2009, 06:35 AM
CL3P20

If you can ..post a few good macro pics of the backside of the GPU. I can locate the mod points for you, if you are unable to find any info on the PCB type. :up:
10-29-2009, 12:59 PM
MetalX

Thanks man, let me see what I can do.

No camera but found this on Google:

http://img407.imageshack.us/img407/7379/img00252491.jpg

That's a 512MB Top but it I believe it is the same PCB as my 1GB.
10-31-2009, 05:12 AM
Ruma

Hd 4870 Golden Sample Vmod

Even though 5 series from ATI is out I think we can get some extra juice from HD4870. With the help from some posts of this thread that's what I did.

My goal: Upgrade from a Hd4870 to a "Hd4890" (gpu= 850mhz) with max vgpu= 1.35v

Here's my contribution to the thread:

The card – HD4870 Golden Sample 512mb:

http://www.itx.ba/images/stories/Rec...tica-slika.jpg

Cooler off:

http://lh5.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod1.jpg

The voltage regulator ( NCP5388 )

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod2.jpg

Since I'm not using the small fan's header I'll use this for ground.

I will also use a fan header to place the VR so I can activate/deactivate the mod whenever I want:

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod4.jpg

Putting the 100kohm VR mod on and without it’s mod off

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod5.jpg

Soldering done, ready to put the cooler:

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod6.jpg

I’ve putted all in the front of the pcb so the wires would be discrete behind the cooler:

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod7.jpg
10-31-2009, 05:14 AM
Ruma

This card has 2 fans, one 80mm pwm and a 70mm fan that’s always on full speed and so it's a bit noisy

I’ll be replacing them with 2 Arctic Cooling 80mm PWM fans connected to the same header.

The heatsink it's good enough so with the new fans it will be a kind of an improvised arctic cooling twin turbo

The wires are too long, reducing to the right length:

http://lh3.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod8.jpg

I’ve putted a light red sleeve to match ATI’s theme:

http://lh4.ggpht.com/_TQFhApIPCAM/Ss...d4870vmod9.jpg

Fans attached:

http://lh5.ggpht.com/_TQFhApIPCAM/Su...4870vmod13.jpg

Mod done:

http://lh3.ggpht.com/_TQFhApIPCAM/Su...4870vmod15.jpg

Card mounted inside case:

http://lh6.ggpht.com/_TQFhApIPCAM/Ss...4870vmod11.jpg

I decided not to put a molex for the readings so I'v attached a small probe for that:

http://lh5.ggpht.com/_TQFhApIPCAM/Ss...4870vmod12.jpg http://lh4.ggpht.com/_TQFhApIPCAM/Ss...4870vmod13.jpg

And tested with Furmark:

http://lh4.ggpht.com/_TQFhApIPCAM/Su...mark_amb23.png

I've flashed the bios with a new profile for this fans.
This 80mm not slim fans (opposed to the majority of aftermarket coolers that use slim fans) are very quiet even at full speed. :cool:
10-31-2009, 05:39 AM
Theorw

Nice job!!!
10-31-2009, 10:26 AM
Ruma

Some measures that prove that ATI it's not as hot as some people say.

Unfortunately we can blame the stock cooler, in the stock cards ATI could have done a better job with the cooling but nothing that can't be easily fixed :)

Ambient Temperature: 23º

Idle:

http://lh3.ggpht.com/_TQFhApIPCAM/Su...idle_amb23.png

Load:

http://lh4.ggpht.com/_TQFhApIPCAM/Su...mark_amb23.png http://lh6.ggpht.com/_TQFhApIPCAM/Su...mark_amb23.png

3D Mark Vantage (Q6600@3.4ghz / HD4870@850/1000):

http://lh6.ggpht.com/_TQFhApIPCAM/Su...0-850_1000.PNG
12-14-2009, 06:57 AM
Mic43

Hi!
I have a reference version of Saphire 4870 with Accelero S1 + two 120mm fans. I have a question. With is better for VRM section - to use original red plate with Acccelero or remove it and cool VRM and RAM with other heatsing?
12-15-2009, 11:33 AM
Larvitar

Hi, guys!

I'm with a HIS 4850 IceQ4, that uses the uP6201BQ of the reference PCB, but the sub-serie is "VLP896", and the structure of VRM is different. Well, a picture speak more than thousand words:
http://img51.imageshack.us/img51/8117/img4464.jpg

http://img187.imageshack.us/img187/3355/img4463cpia.jpg

There are ways to do pencil mod?

Thanks!
01-01-2010, 06:04 AM
mib

Does anyone know how to make Vmods on Asus 4870 Glaciator PCB? This PCB got 4+2 phase.

http://en.expreview.com/img/2008/09/...r__8400_12.jpg
01-01-2010, 07:01 AM
Benji Tshi

Hi guys,

I have a HIS 4850 IceQ4 here, and the PCB is slightly different than reference one (and mine is closer to reference board than larvitar's one :p). Does anyone know if the mods are working on it or if i need a special one ? Thanks.

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