700mhz wall on HD4850 is smashed.

[BeastNotro]

Ok i am still getting a little confused here:

If i want say 750/1100 do i need to do any volt mod either pencil or other wise?

I have Guru's Bios that is 750/1100 downloaded and waiting for my HIS card to arrive i hoping this morning or afternoon.

Now can i just flash the card WITH NO MOD's done at all?

Guru's 750mhz Bios Voltages are set at 0.94 and 1.263 and 1.046.

Now if i just flash what can/could happen, maybe the card won't do 750/1100 and she may not boot???

Now i will be uninstalling my drivers and cleaning them out (before i install card) and then i will be installing the 8.6 hotfix drivers (unless there is newer) once i get card and install it.

So tell what i need to do just to get 750/1100.. thks

[AliG]

hey just wondering, I hear the psu on the 4850 gets really hot, has anyone figured out a good way to keep that cool? The s1 doesn't include any way of cooling it and that's why I'm holding off on it for now

[BeastNotro]

With the S1 and 1 x 120mm fan it will keep it cool enough also use mx2 or artic silver 5, now if you don't have that cooler the stock fan is fine, but you need to flash the bios with a better slope and percentage for the fan speed or do another profile is another option and increase fan speed that way.

So the stock fan is OK, but not OK at stock or Overclocking speeds unless it is Increased one of the ways i just stated or yes aftermarket cooler and fan S1 with a decent 120mm fan and with ramsinks will do the job too.

[ghost101]

hey just wondering, I hear the psu on the 4850 gets really hot, has anyone figured out a good way to keep that cool? The s1 doesn't include any way of cooling it and that's why I'm holding off on it for now

If you mean the VRMs, just stick a few ramsinks on them and the air from the fan should keep them cool. Just buy some with your S1. Or stick a second fan on your s1 with one directly over the VRMs.

[AliG]

That's what I was thinking, but I know that someone forged a vrm cooler for both the 3870 and 8800gt, I'll see if the 3870's fits. And yes I know how to modify the fan speed, take a look at the post count, I've been here a while and happen to know a few things

[Ruiz]

Here is a little guide for installing the accelero s1 with the 4850. First i got to say it wasn't easy and the final result is kind of ugly, but it works and i got great results!!

First you take off the default cooler, just take care of the thermal pads because we are going to use it. Now we need to saw our old cooler.. Take all the thermal pads off and you'll see a little bump in the back of the cooler near the voltage regulator area.. That's were we will saw. Here is the result:






Yep looks like cooper but it's anodized aluminum. Anyway we now have a great heatsink for the voltage regulators so lets install it. I used the thermal pads but i *guess* you can use thermal paste



And install again no secrets here:



Now is the ugly part... The bundled memory heatsinks just wont fit!!



So unless you have another set of heatsinks the best you can do is cut a little part of the heatsink or just be a idiot like i did:



It fits now and that's what really matters



Now my results... Best stable overclocks with bios mod to 1.21v
before accelero: 720 core, 75º load with a lot of noise from the card
after accelero: 745 core, 56º load with almost no noise.

[ghost101]

Now is the ugly part... The bundled memory heatsinks just wont fit!!

So unless you have another set of heatsinks the best you can do is cut a little part of the heatsink or just be a idiot like i did:



.

I had that problem, I simply moved it over slightly towars the other ramsink. Yes it leaves a bit of the chip exposed, but at least I didnt have to do that.

Also your turbo module should be directly over the heatpipes. In fact they are pretty pathetic, they run a bit slow and dont push much air. A 120mm fan works a lot better and if you have a good one it eont make muchnoise.

[BeastNotro]

Why not just get a hacksaw or something like a dremel and trim it down as that is what i would have done....

[Ruiz]

Also your turbo module should be directly over the heatpipes. In fact they are pretty pathetic, they run a bit slow and dont push much air. A 120mm fan works a lot better and if you have a good one it eont make muchnoise.

I put one just above the voltage regulator and the other above the memories... but i guess i'll put then in the middle because i have another 120fan in the front of the card.

Why not just get a hacksaw or something like a dremel and trim it down as that is what i would have done....

I was in a rush But yes, it was a bad idea. When i realized what i did it was too late.

[regenade]

Well I am at 730/1100 after the pencil modding with 1.26vGPU/2.11vMem.Using the stock cooler ATM with 2 X 120mm extra fans blowing on top of them as well.
Nw in rthdribl the max temnps of the GPU is arnd 80 degrees but there is GPU Temp # 2 which really goes overboard at 90 degrees. Can anyone tell what these GPU temps #1, #2, #3 are for.

A screenshot of what I am talking it about.


Also in the stock HSF it seems there is a plastic covering all around with only the core, and the mem chips , VRMs having small gap in the plastic to have contact with the metal area(anodized Al)
Since its covered with plastic isn't it affecting the heat transfer capability and spread out
Here is the pic



Seems the stock HSF is taking too much heat and its affecting the VRMs , ram too much. So which will be a better cooler, the accelero S1 rev2 or the Thermal right Hr 03 GT. These are the only coolers which I can get locally here.

Finally thanks to all for such a helping thread

[Ghigo]

http://www.overclex.net/forum/viewtopic.php?id=1319

New AMDGPUCLOCK 9.8 with thermal controls

[kryptobs2000]

Nice! Can't wait to give this a shot, no more bios modding! Thanks for the link man.

[AliG]

Here is a little guide for installing the accelero s1 with the 4850. First i got to say it wasn't easy and the final result is kind of ugly, but it works and i got great results!!

First you take off the default cooler, just take care of the thermal pads because we are going to use it. Now we need to saw our old cooler.. Take all the thermal pads off and you'll see a little bump in the back of the cooler near the voltage regulator area.. That's were we will saw. Here is the result:




Yep looks like cooper but it's anodized aluminum. Anyway we now have a great heatsink for the voltage regulators so lets install it. I used the thermal pads but i *guess* you can use thermal paste


And install again no secrets here:


Now is the ugly part... The bundled memory heatsinks just wont fit!!


So unless you have another set of heatsinks the best you can do is cut a little part of the heatsink or just be a idiot like i did:


It fits now and that's what really matters


Now my results... Best stable overclocks with bios mod to 1.21v
before accelero: 720 core, 75º load with a lot of noise from the card
after accelero: 745 core, 56º load with almost no noise.

nice, I think I will do the same, but I won't use my own cooler because I want to be able to keep my warranty (how are they going to know that I changed the cooler if I just change it back?)

[LuxZg]

nice, I think I will do the same, but I won't use my own cooler because I want to be able to keep my warranty (how are they going to know that I changed the cooler if I just change it back?)

I agree, I wouldn't saw off original cooler unless there is any other way.

With S1 you get one longer heatsink, used for X800 cards VRMs I think. Looks same like memory ones, but is about the length of 5-6 memory heatsinks combined. I have no access to 4850 for now, but I think it can be sawn in two parts, and should cover whole VRM area on the card. You'll just need something to stick it on with (either Arctic Silver or any paste plus a bit of glue perhaps?). Though that HS has holes, but I doubt they'll match 4850's :/

EDIT: Unless someone has both 4850 and this HS with S1, I can take a measure of HS and holes, and one of you can check if it would fit on 4850, or if maybe even holes match. Will be posting picture/dimensions in a few minutes, just have to get my camera

EDIT2: 9.4cm length x 2cm width, and holes are 8.9 appart;middle part that would lay on VRMs is 9mm wide.

[RobinL]

i use a 100k VR... i dont use pencil anymore.. its not as reliable..

What brand do you have over there?

[FELIX]

...is someone have modded a Sapphire HD4850 bios with RBE?

I just tried myself to flash my card:
my setting:

Clock info 1: 300/500 0.99v
Clock info 2: 500/750 1.046v
Clock info 3: 710/1100 1.263v
Clock info 7: 710/1100 1.263v
Clock info 8: 710/1100 1.263v
Clock info 9: 710/1100 1.263v

Work fine!

[vengance_01]

fleix go to tech power up and grab the newer MSI bios. Then only edit two section which should have the stock clocks 625/993 or something close. Make sure they are the same.

[Devious]

Ive done the pencil mod on my 4850 but over 1.35v im getting random reboots when running Fur bench even as low as 700 on the core. im running a 850w Silverstone Zeus, do you think this extra voltage is pulling too much ? i dont want to buy another psu and find its the same. could it be a setting on my maxumus formual mobo ?


btw cards are water cooled, never going above 45c and i have heatsink on the VRM's and according to GPU-z the dont go over 45c with a fan blowing on them.

[BeastNotro]

Ive done the pencil mod on my 4850 but over 1.35v im getting random reboots when running Fur bench even as low as 700 on the core. im running a 850w Silverstone Zeus, do you think this extra voltage is pulling too much ? i dont want to buy another psu and find its the same. could it be a setting on my maxumus formual mobo ?

What resistor was it and how did you put pencil on it.. like on TOP or the side of it ... as it very tiny to do side..... can you take a PIC for me???

[Devious]

Cant take a pic atm, i tried to do it on top but it very hard to be precise with such a small resister. I have another 4850 and on this one i have used silver paint and got 1.43v, this card reboots at 670 core which makes me belive its either my psu the 4850's can handle such voltage but maybe the 4870 can.

[ghost101]

Ive done the pencil mod on my 4850 but over 1.35v im getting random reboots when running Fur bench even as low as 700 on the core. im running a 850w Silverstone Zeus, do you think this extra voltage is pulling too much ? i dont want to buy another psu and find its the same. could it be a setting on my maxumus formual mobo ?


btw cards are water cooled, never going above 45c and i have heatsink on the VRM's and according to GPU-z the dont go over 45c with a fan blowing on them.

I think its possible that the 150w supply via the pci-e slot and pci-e 6pin isnt enough. 150w for all pci-e 1.1 boards. I think pci-e 2.0 boards can supply 150w via the slot and so theres 225w available.

Think about it this way, at 1.35v compared to stock of 1.15v, the power consumptiion has increased 38% before any clock increase. At 1.4v this is 48%. Say you hit 800mhz for the core, thats a combined increase of 76% and 89% respectively.

At a peak wattage of 109w



and if we attribute 80% of that to the core. A 76% increase in core power consumption is an increase of 66w. This is a peak wattage of 175w. For the 2nd scenario it would be even higher.

NB the 80% attributation to the core is a pure guess. Also, if the card xbitlabs used has a lower than 1.15v stock voltage, it would be even higher.

[BeastNotro]

Hey Ghost101

Ok now i ran a benchmark 3dmark 06 at 740/1100 and it passed now that i figured out that damn resistor pencil crap.. which it is better to do it on the side of the resistor then on top.

Anyhoo i am at 0.96 idle and 1.22v on load.

My temps max in 3dmark 06 was around 64-69C is what i seen between the tests and i was usuing everest to read it, my idle temp is around 49-54C depends on what i doing.

Of course fan speed was adjusted VIA bios flash and what i setup it up too.

Now i may 750mhz/1100 to see if it passes.

Oh one thing is... i only got about 420 more points in 3dmark 06 from my default stock speeds... why???

Thats not very impressive at all.... i am using the 8.6 hot fix drivers at stock ATI CCC settings ... basically i never tweaked anything, no High Performance or nothing.. just whatever it defaults too.

[ghost101]

snip

Whats the rest of your system? 3dmark06 doesnt scale perfectly as you overclock. Use the gpu score in 3dmark vantage. Even that only scales ~80-90% as you overclock.

[BeastNotro]

Whats the rest of your system? 3dmark06 doesnt scale perfectly as you overclock. Use the gpu score in 3dmark vantage. Even that only scales ~80-90% as you overclock.

I have:

AMD 5000+ Oc'ed to 3.150mhz, Scythe Ninja Heatsink, Artic Silver 5 applied.
2 x 2GB PC2 1000 memory, running at DDR2 800
1 x 160GB sata 2 HD, Seagate.
650w ToughPower PSU.
1 X dvd-rw
1 x floppy
19 inch CRT monitor.
Antec 900 CASE all fans running and side fan added too.

Asus Cheapo (but decent little Mobo) Model: M2A-VM ... not the HDMI model.

[AliG]

I agree, I wouldn't saw off original cooler unless there is any other way.

With S1 you get one longer heatsink, used for X800 cards VRMs I think. Looks same like memory ones, but is about the length of 5-6 memory heatsinks combined. I have no access to 4850 for now, but I think it can be sawn in two parts, and should cover whole VRM area on the card. You'll just need something to stick it on with (either Arctic Silver or any paste plus a bit of glue perhaps?). Though that HS has holes, but I doubt they'll match 4850's :/

EDIT: Unless someone has both 4850 and this HS with S1, I can take a measure of HS and holes, and one of you can check if it would fit on 4850, or if maybe even holes match. Will be posting picture/dimensions in a few minutes, just have to get my camera

EDIT2: 9.4cm length x 2cm width, and holes are 8.9 appart;middle part that would lay on VRMs is 9mm wide.

sounds good, the mounting holes are about 5 cm apart, but I can probably get a 4850 cooler no problem since anyone that has gone with water won't need their cooler