ATI 4850/4870 voltmod thread

[Barr3l Rid3r]

It's a job for the w/e. I can't get any sinks to stick... so i might chop the stock hsf in half and bolt it on.

I was thinking on that eighter but we might loose the warranty that's not good...

[babalouj]

For the people that have done the vddc and the vddq on the 4870. What voltage are you shooting for? What voltage is too high? How much have you gained from the vmem mods?

[SNiiPE_DoGG]

It's a job for the w/e. I can't get any sinks to stick... so i might chop the stock hsf in half and bolt it on.

whats your resistance for 1.4v? im having artifact issues over 886... 30ohm 1.36v

[MonsterMash]

There's a pencil vgpu mod for the 4870?
Thx, bye

[drizzt5]

I don't think there is one yet.

[Cardnyl]

I know this might seem like a strange question for this forum but what if I wanted to force either of these cards in reverse. Would an underclock/undervolting be easier to achieve via softmod than hardmod? Any ideas as to how it might be done using the latter?

[Caveman787]

actually you can lower clocks and possibly volts for 2d mode in AMD gpu tool.

[mth91]

I meant arctic alumina adhesive for the attachment of heat sinks, but I figured you'd know what I meant.

[sandwichamwin]

I was thinking on that eighter but we might loose the warranty that's not good...

I think the warranty went out the window when we started adding waterblocks, ramsinks and soldering things onto our cards .

I might make them very cold soon... maybe



@SNiiPE_DoGG - I'll check tonight when i get home from work.

[Barr3l Rid3r]

Woww nice improovement

24/7 VGA settings @ 1.33V 850/2200Mhz (34ºC GPU temp idle / 41ºC Load)











Sinks originais voltam para os Mosfets

[flopper]

I think the warranty went out the window when we started adding waterblocks, ramsinks and soldering things onto our cards .

What!
Darn, if I knew that I would never ever modify my card.
I mean, dont they know that 3 party cooling is better than stock?
And adding more power and run the card faster is better value for their cards?

I mean, they should encurage us to run it faster and faster

[SNiiPE_DoGG]

What!
Darn, if I knew that I would never ever modify my card.
I mean, dont they know that 3 party cooling is better than stock?
And adding more power and run the card faster is better value for their cards?

I mean, they should encurage us to run it faster and faster

hahaha wait, you seriously didnt know you void your warranty with third party cooling, man that sucks, but its not all bad as long as you are careful with your card it wont die, they are pretty sturdy components

[Jarrstin]

Can I increase the voltage through the bios without a voltmod?

[alexio]

hahaha wait, you seriously didnt know you void your warranty with third party cooling, man that sucks, but its not all bad as long as you are careful with your card it wont die, they are pretty sturdy components

Yeah, he's obviously serious

[Boogerlad]

Can I increase the voltage through the bios without a voltmod?

no.

[LuxZg]

no.

Why saying no? OK, haven't seen anyone doing it on 4870, but I've seen many people having higher OCs by using MSI BIOS with higher voltages. OK, could be something else, like a tweak in BIOS.. but seems to work for 4850 cards.
(EDIT: Oh, and ofcourse it's limited to some 1,2 volts, can't go as high as hardmods can..)

P.S. I don't see what's his card, sooo...

[SNiiPE_DoGG]

Why saying no? OK, haven't seen anyone doing it on 4870, but I've seen many people having higher OCs by using MSI BIOS with higher voltages. OK, could be something else, like a tweak in BIOS.. but seems to work for 4850 cards.
(EDIT: Oh, and ofcourse it's limited to some 1,2 volts, can't go as high as hardmods can..)

P.S. I don't see what's his card, sooo...

bios volts has no effect on 4870, i tested with digital multimeter, and avg'ing

[cowie]

Woww nice improovement

24/7 VGA settings @ 1.33V 850/2200Mhz (34ºC GPU temp idle / 41ºC Load)
sinks originais voltam para os Mosfets

very nice job
being on air myself,i'v found the 1.31ish range was a great comprimise between speed and heat

[Barr3l Rid3r]

very nice job
being on air myself,i'v found the 1.31ish range was a great comprimise between speed and heat

Yep, I could reach 900Mhz but only using 1.42V Full load temperatures still very cool but I think 1.4V is too much for daily use in this core. 3D06 run at 900Mhz air...

[Skauneboy]

For the people that have done the vddc and the vddq on the 4870. What voltage are you shooting for? What voltage is too high? How much have you gained from the vmem mods?

Anyone? I'm reading 1.51V for both MVDDC and MVDDQ so there should be some headroom since Qimonda specifies a max voltage of 2.0V. Just waiting for my tubing to arrive from Sidewinder so I can re-assemble my loop and put those jumpers on my vmods.

[sandwichamwin]

For anyone new to the sport, i added a small guide (like my 4850 one) on volt modding the 4870. Credit is due to the people here of course.

http://sandwichamwin.blogspot.com/20...ng-hd4870.html

[Skauneboy]

Great guide sandwichamwin. I can't believe I never thought of putting the 3-pin connectors on top of the trimpots, much less clutter that way. I noticed a typo in your guide though, it's supposed to be a 50ohm trimpot for VGPU, not 5. Kinda important.

[sandwichamwin]

Great guide sandwichamwin. I can't believe I never thought of putting the 3-pin connectors on top of the trimpots, much less clutter that way. I noticed a typo in your guide though, it's supposed to be a 50ohm trimpot for VGPU, not 5. Kinda important.

Whoops, i went over it again and again. Can't win 'em all

Thanks for the comment

[mattkosem]

I'm getting ready to vmod my 4870, and am slightly concerned with the comment at http://sandwichamwin.blogspot.com/ stating "Before continuing, double check that the resistance is still set at 50ohms and the jumper is set in the 'off' position (not connecting the trimpot to ground)! We wouldn't want to boot up and have a dead card would we?"

What is meant by this? I've vmodded 2 other cards, and not had any concern with booting with the mods enabled. Am I missing something here or misreading this? I see other folks with hard-wired mods (http://img59.imageshack.us/my.php?image=img0975dp9.jpg), but am thrown off a bit by that comment. Can someone clarify?

-Matt

[dejanh]

To those that are (still) wondering about BIOS voltmods, I and several other people have confirmed before that BIOS voltmods DO NOT WORK

Now, in terms of the 4870 XOC BIOS, it is a waste of my time to post it at all. The stuff I mentioned before was before I stressed the card with ATITool and FurMark. The card is utter crap, and the BIOS is a joke. All it lets you do is use CCC OverDrive to clock the card to max 990 core and 1200 memory. The voltages used on this card and in the BIOS are all stock, 1.263V core, 1.501 memory. Luckily I bought mine for just $5 more than stock 4870. The card artifacts too right out of the box at 800/1100 in ATITool after about 30 minutes of running it. Any higher and you will be seeing artifacts in the first 5 minutes or even 10 seconds, lol. FurMark only runs at 800/1100. Any higher and you are in for a system crash (not a power problem as I have a CM EP 600w and only 1 4870 XOC). I have already returned one card, and the second does the same. Extra voltage seems to stabilize the core and remove the artifacts but then it seems the memory loses OC ability and stability in full-screen 3D apps goes into the pooper. Also, other people with the XOC have tested their cards with same results. Not only do they not give a benefit, but it is almost looking like they are bad OCers in general :s Anyway, on the state of these cards you can see more here...

http://forum.ncix.com/forums/index.p...t=29&subpage=1

Maybe you guys can help us build a bit more momentum spreading the word too possibly forcing Diamond to do something about this. As it stands now 4870 XOC is a piece of junk.