ATI 4850/4870 voltmod thread

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12-03-2008, 09:49 AM
ceemic

@lex, macro closeups from PWM and IC please.
12-03-2008, 02:29 PM
regenade

Here is the new Powercolor PCS+ HD 4870 1GB. They have changed from the AMD reference PCB to some other LF R77F PCB. Here is some pics. It will be great if some one has any idea abt VGPU mod or the measure points at least :)

http://www.imgx.org/thumbs/small/272...28Large%29.JPG

http://www.imgx.org/thumbs/small/272...8Custom%29.JPG

http://www.imgx.org/thumbs/small/272...28Large%29.JPG
12-03-2008, 02:37 PM
Vatos_locos

on the second picture what is written on the square ic

NCP6... ?????

this is for the gpu

and for the mems

second picture again up on the buttom of the card near the pcie power connectors there is a 8 leg ic what is written on it ?
vP6... ????
12-03-2008, 03:31 PM
Barr3l Rid3r

Quote:

Originally Posted by regenade

Here is the new Powercolor PCS+ HD 4870 1GB. They have changed from the AMD reference PCB to some other LF R77F PCB. Here is some pics. It will be great if some one has any idea abt VGPU mod or the measure points at least :)

http://www.imgx.org/thumbs/small/272...28Large%29.JPG

http://www.imgx.org/thumbs/small/272...8Custom%29.JPG

http://www.imgx.org/thumbs/small/272...28Large%29.JPG

is it an 4 phase vrm + 1phase memory?

looks the same as gigabyte 4850 1gb own design pcb except that gigas has more caps and better ferrite inductors
12-03-2008, 04:24 PM
Jim M0rrison

Oh crap. Have that Powercolor 1GB incoming as well. So... the mods posted on techpowerup won't apply to this design? (Don't have the card yet, but picking up in a day or so).
12-03-2008, 11:50 PM
regenade

Quote:

on the second picture what is written on the square ic

ON
NCP 5388

Isn't the same voltage controller there on the Palit/gainward Sonic HD 4870 cards?

Quote:

second picture again up on the buttom of the card near the pcie power connectors there is a 8 leg ic what is written on it ?

That one is nt very clear...will take out card & check again.
Seems to a National Semiconductor LMXXX
12-04-2008, 04:17 AM
@lex

Quote:

Originally Posted by regenade

Here is the new Powercolor PCS+ HD 4870 1GB. They have changed from the AMD reference PCB to some other LF R77F PCB. Here is some pics. It will be great if some one has any idea abt VGPU mod or the measure points at least :)

Are you sure there's no softvmod for your board? I know there is SVM for reference 4870.
12-04-2008, 04:25 AM
NapalmV5

@ ..Powercolor PCS+ HD 4870 1GB.. first pic

what inductors ?
12-04-2008, 04:42 AM
Jim M0rrison

Quote:

Originally Posted by @lex

Are you sure there's no softvmod for your board? I know there is SVM for reference 4870.

Im getting that card (or, not sure what version, but chance is I get the second rev.), and I really want to get my soldering eq. out, so I for one hope there is a hard-mod solution :)

Earlier, like page 46 or so, someone had modded a 4870 pcs 1GB, but there are two versions. I still haven't picked mine up (though its waiting for me) so I dont know what rev, but I highly suspect that its the "second rev." which sort of pisses me off, because I read everywhere its crap for OC, and often doesn't even run stable at factory OC (780MHz).

Anyway, renegade - if you take your card out again, could you do me/us a favor and take some more pics, front/back, at as high qality as you can? Would be great if you could!

Thanks!
12-04-2008, 05:29 AM
@lex

Quote:

Originally Posted by ceemic

@lex, macro closeups from PWM and IC please.

Here

These are the best I can take with my 6 Mpx camera. Tell me what area you want to see in details.
Thanks for helping.
12-04-2008, 05:34 AM
Barr3l Rid3r

Quote:

Originally Posted by Barr3l Rid3r

is it an 4 phase vrm + 1phase memory?

looks the same as gigabyte 4850 1gb own design pcb except that gigas has more caps and better ferrite inductors

Anybody?
12-04-2008, 08:50 AM
Jim M0rrison

Ok, got it confirmed that the version I bought (and still didnt collect/open) is the rev2 of the Powercolor 1GB "pcs". This means, basically, that it is gimped from birth. For example, its supposed to be clocked at 780MHz from shipping, and still, people (buying from the same batch as I) recieve it at a factory 750MHz. This alone compared with the fact that I have read over and over that the rev2 is crap quality, not stable at 800MHz etc, makes me wonder weather I should even open my package?

Anyone here who has successfully clocked/modded (that's what I want to do - hard mod) a powercolor 1GB pcs rev2?
12-04-2008, 08:55 AM
andL64

its the same controller like here on my gainward GS its good for up to 970 3dmark @ 1,60V

4phase delivery is great! i wouldnt change card...

find pin 19 on the datasheet and measure resistance between fbpin and ground then set 20x vr between fb and ground, finished.
12-04-2008, 09:46 AM
regenade

Quote:

find pin 19 on the datasheet and measure resistance between fbpin and ground then set 20x vr between fb and ground, finished.

can you elaborate a bit may be with some pictures ? Also giving the stock resistance value will be helpful for finding the pin as well :)
12-04-2008, 10:01 AM
Jim M0rrison

Quote:

Originally Posted by andL64

its the same controller like here on my gainward GS its good for up to 970 3dmark @ 1,60V

4phase delivery is great! i wouldnt change card...

find pin 19 on the datasheet and measure resistance between fbpin and ground then set 20x vr between fb and ground, finished.

Thanks for the response. I really don't want to go OT here, but its a fact that there are numerous threads on different forums where people complain about their revised version of the powercolor 1GB pcs. Even if the controller is good, can't there be cheapo inductors/resistances etc?

In any case, the card was really cheap when I bought it, so I guess Ill take my chances - I'll be modding some crazy ghetto cooling (air, ofc) and maybe that'll help my case ;)

Could I assume the stock voltage is the same as for reference cards, when identifying the 19'th pin?

Also, anyone knowledgeble on the vmem points? (For the non-reference pcb of the Powercolor 1GB "pcs" version 2...)

Thanks!
12-04-2008, 11:24 AM
ceemic

regenade, same as: http://ceemic.pri.ee/hardware/hd4850gs/

@lex, same as: http://ceemic.pri.ee/hardware/hd4850_2/
12-05-2008, 02:34 AM
@lex

Quote:

Originally Posted by ceemic

@lex, same as: http://ceemic.pri.ee/hardware/hd4850_2/

Thank you very much!
Is that your site? You've vmodded all those cards? Incredible!
Was that a card with Glaciator fansink? Would there be any problem changing it to S1? Is it possible to switch back?
How do you think, is this this card better than the reference, I mean overclocking?
Thanks again!
P.S. For pencil mod I need to shade between points you've shown with green oval? Did i get it right?
12-05-2008, 03:35 AM
Maxon

Hello from germany!
my name is Michael and i following this thread very interested. I got a Radeon HD4850 from Gainward (not the GS one) i increased the core clock to 675mhz and ram to 1100mhz. It run´s very stable. now i tryed to increase the core more but i think the vcore issn´t high enought. i set ist to the maximum (1.18V) now i think i need a pencil mod, but i couldtn´t found for this PCB a pencil mod? when yes, how?

anyone an idea?

thank you very much an best regards

Michael
12-05-2008, 06:31 PM
8800's@over

Celebrities,

None of Pencil Mod for the GPU in 4870?
12-06-2008, 01:41 AM
Jim M0rrison

Quote:

Originally Posted by 8800's@over

Celebrities,

None of Pencil Mod for the GPU in 4870?

No, none, sorry (very low ohmage needed, and no solution as of yet).

Quote:

Originally Posted by renegade

Here is the new Powercolor PCS+ HD 4870 1GB. They have changed from the AMD reference PCB to some other LF R77F PCB. Here is some pics. It will be great if some one has any idea abt VGPU mod or the measure points at least :)

Thanks to ceemic and the help of a curcuit-savvy friend, Im on this. I will probably make at least the GPU-mod this evening (+1 GMT here, so... later). I found a vMem measurment spot, and have identified the vGPU-soldering and measurement point.

Not sure Ill make anything of the mem-mod (wont make much of a difference it seems), and I need to confirm what VR to use for the GPU mod. When I do, and finish the mod, Ill post pics for you here, and anyone interested in v-modding the non-reference Powercolor 1GB "pcs" rev2.

Side note: My card clocks to about 800MHz/985MHz on stock voltage - artifact free in ATitool (haven't tried for any longer time yet, but preliminary). The temp hardly moved, so I have to assume its lack of voltage that stops me at that point.
12-06-2008, 05:37 AM
@lex

Quote:

Originally Posted by 8800's@over

Celebrities,

None of Pencil Mod for the GPU in 4870?

You can use software voltmod, if you want.
12-06-2008, 06:10 AM
Blazing fire

What's the difference between the Blue and red PBC boards?
12-06-2008, 07:04 AM
Vatos_locos

i think blue are made by sapphire :)
12-06-2008, 03:28 PM
gamervivek

results of pencil modding my HIS IceQ4 4850-
http://img389.imageshack.us/img389/2963/finalracc9.png
http://img389.imageshack.us/img389/f...png/1/w800.png

using MX-2 helped a lot,game temps hardly reach 55C,memory and vrm get pretty hot.

crysis results with a 2140@3.2Ghz,
stock 625/993-
http://img242.imageshack.us/img242/4879/c1ri8.png
http://img242.imageshack.us/img242/c1ri8.png/1/w800.png

overclocked 850/1150-
http://img166.imageshack.us/img166/4085/c2rk4.png
http://img166.imageshack.us/img166/c2rk4.png/1/w800.png
12-06-2008, 04:27 PM
Jim M0rrison

Powercolor rev2 4870 1GB "pcs"

@Gamerviek: Wow! That's yield for your time/money indeed!

Small update on the powercolor 4870 pcs rev2: Measured the FB->gnd and got 16kOhm (from several spots).
http://img248.imageshack.us/img248/8...uresth0.th.jpg
Didn't have a 200k+ vr at home, so the testing will have to wait for a while, but if anyone also interested in modding this card could verify this 16k res, I'd be grateful!

Further: Stock vGPU is ~1.31v in windows, no load, and vMem is ~1.6v, same setting.

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