ATI 4850/4870 voltmod thread

[jimmyz]

Is there a different solder spot fro the 4870 gpu v mod ?
see I killed the trace shown here in the pic. The little dot on the right side.

I see the same trace on the gpu side I could use but I would have to remove the cooler..
pain in the butt.

I wouldn't recommend the other side. how did you burn it? can you show a pic? did you clean the area before soldering?

[W1zzard]

if you broke the via where the vmod connects to, then your card is probably dead. if it still works i'd suggest you leave it alone and enjoy while it lasts. if you cant manage to solder to such a point i dont think you should do voltmods, no offense.

this point is the only spot on the back side of the PCB

[rym]

ok, the spot is somewhat like a mushroom , the head being the part you see
[a dot]. that part came off leaving the stock of the trace going to where it goes on the other side. Actuallythe dot its a hole going through the card to the other side connecting to a pin on an blacksquare thingy.
[ controls voltage i think]so the the head gone, leaving a smaller dot. to small to solder to. the trace still works fine.. so does the card. I hope you under stand . I can draw a picture if your brains arent working .. just kidding..


surface before ----- after -

[zbomb5610]

so i was able to get 900/1255 stable and artifact free using pencil mods. 1.41v gpu, 2.07v memory. i really like this card.

[jimmyz]

ok, the spot is somewhat like a mushroom , the head being the part you see
[a dot]. that part came off leaving the stock of the trace going to where it goes on the other side. Actuallythe dot its a hole going through the card to the other side connecting to a pin on an blacksquare thingy.
[ controls voltage i think]so the the head gone, leaving a smaller dot. to small to solder to. the trace still works fine.. so does the card. I hope you under stand . I can draw a picture if your brains arent working .. just kidding..


surface before ----- after -

I don't need a picture, I won't be reading your posts anymore, as W1zzard stated if you couldn't solder to a pad, V-mods aren't for you. this is probably the simplest spot to hit in the history of volt modding, it is in the open with much more room around it than just about any others.

[rym]

Sorry man I didnt mean to come off like that..
Just look at this pic. the solderpad is gone.. where else can I solder on the back side ? I know how to solder. what else can i do here beside the gpu side of the card. Oh i must off pulled the wire a bit when tunning in my 100 ohm variable resister to below 50ohm .
the solder pad came off.




randy

[jimmyz]

Sorry man I didnt mean to come off like that..
Just look at this pic. the solderpad is gone.. where else can I solder on the back side ? I know how to solder. what else can i do here beside the gpu side of the card. Oh i must off pulled the wire a bit when tunning in my 100 ohm variable resister to below 50ohm .
the solder pad came off.




randy

I don't have a card available to test. run yours as it is for now and keep checking the thread. if others find an alternate mod place this thread is where it will most likely appear.

[J.D.]

Hi,
if it is to be made possibly to more V-GPU by software, soon W1zzard ?


My result

[W1zzard]

you can only do the bios mod to around 1.2v but thats it. not more possible in software

[J.D.]

you can only do the bios mod to around 1.2v but thats it. not more possible in software

THX

I meant the HD4870 not the HD4850

[Devious]

Got my 4850's working happy now at 800/1075, not tried the mem mod yet.

Did some testing with these cards last night on 3D mark 06 , i ran the tests a few times with my cpu @ 3.8Ghz and as i clocked the cards over a certain point the scores started to get worse


Q6600@3.8Ghz

750/1050 = 20229
800/1075 = 21328*
825/1100 = 21199
850/1080 = 21103


Very odd, if thats the case then i might back down my 1.4v to 1.25 if its not getting me any faster speed.

I need to try it in some other games/test.
__________________

[jimmyz]

THX

I meant the HD4870 not the HD4850

Same answer though. the max the 4870 will give you is 1.263 or so.

[SetteUltras]

Can someone please tell me what is the actual (via multimeter) gpu voltage of the stock 4870 (with stock bios and no mods) @idle and @load?
Thank you!

[Devious]

Can someone please tell me what is the actual (via multimeter) gpu voltage of the stock 4870 (with stock bios and no mods) @idle and @load?
Thank you!

Its been asked for a lot but never given, i think 4850's owners bought all the multimeters

[SetteUltras]

Its been asked for a lot but never given, i think 4850's owners bought all the multimeters

Ι am a 4850 owner too... trying to decide if 1.2V @idle / 1.45V @load is safe for every day use (800/1100)

[rym]

my 4870 measure 1.3v stock from factory..800/1050 the other 800/1150 one hit 875 on th gpu with 1.35v
Iuse stock heatsink but rev up the fan speeds/oc via bios.

[Devious]

Thanks, so 1.3v it is. Im not sure what you mean by the other with 1.35v.

[rym]

1.35 with volt mod

[Devious]

Thanks

[SetteUltras]

1.3v both idle and load out of the box?
Because 4850 idles 1.08v while on load is 1.15v

[rangerone7669]

a few questions about this.

i have a 4870 and am confident i can do the soldering. but the smallest pot i have is a 1k ohm 15 turn .75 watt. i stuck it on my DMM and adjusted it down to 50ohm, its a little sensitive but i think it will work.

do you more experience guys think this pot will work, or should i order a different one?

[STEvil]

Order a different one.

I also suggest a 5 ohm fixed resistor in series to keep from creating a dead short.

[diablos]

Hi guys,
are you sure that this vdcc measure point is right?
http://www.techpowerup.com/articles/...s/overview.jpg

I read 12.17 volt

[diablos]

Hi guys,
are you sure that this vdcc measure point is right?
http://www.techpowerup.com/articles/...s/overview.jpg

I read 12.17 volt

I've find the measure point and correct the photo

[r4st4m4n]

Can someone please tell me what is the actual (via multimeter) gpu voltage of the stock 4870 (with stock bios and no mods) @idle and @load?
Thank you!

I read 1.285V idle / 1.3V ATI tool load (840/1050, Sapphire HD4870 stock bios with fan mod)