ATI 4850/4870 voltmod thread

[DemonEyez]

Asus EAH4850/HTDI/512M has 3 phases.
Both EAH4850/TOP/HTDI/512M and EAH4850/HTDI/1G have just 2 phases, not 4 (inductors ≠ phases).

What did you ask from Diamond? To help with a vmod?

I need to do my home work better You're right. The EAH4850/TOP/HTDI/512M and EAH4850/HTDI/1G both use a 2-phase double choke design. So that would mean these cards still also use the ATI reference PCB, right?

[gurusan]

Anyone here have a gigabyte 4870? Do you know what mem modules they use? How does the card clock?

[jdrom]

What did you ask from Diamond? To help with a vmod?

The exact opposite, nothing at all. Trying to get it RMA'd (I know, it's dishonest but I'd rather not have a $200 paperweight).

[Barr3l Rid3r]

I need to do my home work better You're right. The EAH4850/TOP/HTDI/512M and EAH4850/HTDI/1G both use a 2-phase double choke design. So that would mean these cards still also use the ATI reference PCB, right?

I think reference 4850 uses an 4 phase design

[largon]

Barr3l Rid3r,
No, reference 4850 is 2 phase.

[DemonEyez]

So Techpowerup is mistaken in this review?:



The reference design HD 4850 cards all used a three phase power design which tended to get quite hot. HIS went with the four-phase route which distributes the load over more components.

http://www.techpowerup.com/reviews/H...0_IceQ4/4.html

[Blazing fire]

I'll measure this evening




It's an Asus HD4850 ( EAH4850/HTDI/512 ) and it uses Qimonda chips:


This is how my card is cooled:

+


Gives me 33 degrees stessed, 700MHz on the core (could go higher, I reckon) and 2300 on the Qimonda chips

Those are really low temps. How does it perform with the stock heatsink without the GPU hs?

And more importantly, what was the room temperature and air flow like?

[largon]

So Techpowerup is mistaken in this review?:

http://www.techpowerup.com/reviews/H...ages/vreg2.jpg

The reference design HD 4850 cards all used a three phase power design which tended to get quite hot. HIS went with the four-phase route which distributes the load over more components.

http://www.techpowerup.com/reviews/H...0_IceQ4/4.html

Yep.
Infact, that HIS card is a reference board - just blue that is. The card's a carboncopy of Powercolor or MSI.

edit:
The phase controller on HD4850 is the uP6201 which supports upto 2 phases...


edit2:
Good thing you mentioned about the TPU article... I'm an editor there so I can correct the article. edit3: Aww... W1zz has locked the article. I'll just notify him.
=)

[DemonEyez]

Those are really low temps. How does it perform with the stock heatsink without the GPU hs?

And more importantly, what was the room temperature and air flow like?

Room temperature was 21 degrees Celcius and the card has an 80mm fan @ 1000 rpm pointed at it. Mind you that 700MHz for the GPU was pre voltmod and pre bios mod.

If I remember correctly the temps with the orginal stockcooler were around 90 degrees for the GPU at full load before I did the mods and all
Only had it running with the stockcooler for one day

Nowadays it's been voltmodded to 1.37v for 850/2350 during load, which gives me around 40- 43 degrees stressed.

[ceemic]

But I still can't figure out VGPU mod by myself

I would appreciate any help.

Same here
Asus EAH4850/HTDI/512M with 3-phase PWM. Can't figure out these controller IC's

[NBF]

Same here
Asus EAH4850/HTDI/512M with 3-phase PWM. Can't figure out these controller IC's

I even tried to measure several points, but makes no sense to me.

Im about to give up, beaten by some freaking ICs... Cant believe it.

[ceemic]

I'll probably solder VR's for every IC leg and start to test which changes Vgpu
I won't give up, I have LN2 pot for that card waiting

[largon]

ceemic,
Try the pin in top left corner of the 16pin "AP-AG" in NBF's pic...

[ceemic]

largon, tnx again!


Use 100k or 200k VR. I'll do the mod ASAP and report back

[GamerBR]

I'm having some issues here,my card works just fine with AtiTool,no artifacts at all,also using FurMark while in XtremeBurn it's just ok too,but while playing Crisys it will often during game play just hang the program,with some less times hanging Windows(with a blue screen,talking about the driver entered in a loop),any idea what to do here?My sensor(mainly MemIO)is really hot,while in xtreme burns it gets up to 95,and while in AtiTool up to 90°C,but as far as I know this card can take that just fine,can't it?
Also my voltage and clocks are not that high,760/1078(HD4850)
EDIT:Problem solved,I bought a Zalman VF900CU to put on it and apparently it doesn't have a good contact area with the die with the general amount of thermal paste that is needed to used,I added a thicker layer and now I'm getting much better temperatures.

[ceemic]

I haven't got time to mod my Asus, but friend of mine gave me his two Gainward HD4850 512MB Golden Sample




Other pics: http://ceemic.pri.ee/hardware/hd4850gs/

Def Vgpu changed (idle/load) 1,194V/1,214V -> 1,207V/1,221V

[bartx]

Good work

[ceemic]

bartx, tnx

[G-UNIT91]

I haven't got time to mod my Asus, but friend of mine gave me his two Gainward HD4850 512MB Golden Sample




Other pics: http://ceemic.pri.ee/hardware/hd4850gs/

Def Vgpu changed (idle/load) 1,194V/1,214V -> 1,207V/1,221V

hi,

you have perfect profile photo?

THX

[NapalmV5]

sapphire @ powercolor bios/stock cooler/air/vmods

[ceemic]

G-UNIT91, what profile?

NapalmV5, what Vgpu? 3D stable?

[NapalmV5]

i wish.. can bench anywhere from 900-940 core/~1090 mem

havent monitored voltages

[G-UNIT91]

G-UNIT91, what profile?

NapalmV5, what Vgpu? 3D stable?

I'm referred to profile for view the height of all components (GDDR; mosfet etc.).

I must make a little toy..

[ceemic]

G-UNIT91, why You need that?

[Barr3l Rid3r]

Barr3l Rid3r,
No, reference 4850 is 2 phase.

Well so why its more stable, cooler and allow higher OC at same voltage then average 4870 using 3 phase digital VRM?