Sapphire HD4850 Bios Modded, Core upper Limit to 850Mhz in CCC!

[Mysterfix]

So wait... If I flash my asus 4850 with this. It will be default clocks of 700/1100, but it will have a vcore max of 1.327v's? Meaning I could quite possibly with the proper cooling get it to 800 core? :/

Yes, if the voltage is able to go up to the max of 1.327v set in bios then you could get the core upto around 850mhz.

[drizzt5]

With just a bios flash.... wow....

Now I really really need to read up on it. Do I need a multimeter for a bios flash like I need for a pencil mod or volt mod? Because I don't have one on hand.

[Mysterfix]

To be honest I don't know if the 1.327v bios mod actually works, my cards are hard modded so you'll have to waite for Leonarderman to chime in.

[drizzt5]

Oh, it kind of sounds too easy to be true :/

[awdrifter]

Here is your Bios:

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V no modded

Asus HD4850 Light Overclocked

Thank you, the card should be here tonight, I will definitely try it out.

[ken]

So wait... If I flash my asus 4850 with this. It will be default clocks of 700/1100, but it will have a vcore max of 1.327v's? Meaning I could quite possibly with the proper cooling get it to 800 core? :/

nah, you would get around 1.2v at best. anything higher than that would need pencil/hardmod.

my Asus HD4850 needs around 1.28v to do 800MHz stable btw

[drizzt5]

oh, so is it not worth doing a bios mod?

[ken]

oh, so is it not worth doing a bios mod?

it still worth it if you want the higher limit in the CCC Overdrive and little extra voltage (1.13v => 1.2v-ish) for overclocking. Im not sure if the one from leonarderman already has the soft-mod done though :p

[drizzt5]

Ok, what I will do is OC as high as I can with no mod's. I need to be told how to do the rest of this stuff afterwards though :P
http://www.xtremesystems.org/forums/...68#post3195868
Could you help me out please?

[leonarderman]

Please note: Don't try to use Pencil mod if you don't have a better cooler (Water cooling is best for use). Because pencil mod can give vcore 1,4V - it'll make your HD4850 card too hot. I tried with my Sapphire HD4850 Toxic + Zalman VF900, it's so hot that I can't Overclock GPU core more than 815MHz.

leonarderman, do you think you could mod my HIS bios? I have it linked in a post at the beginning of page 2.
Thanks.

Here's your HIS HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 800MHz
Mem upper limit 1300MHz

Can you mod my original bios and change only the upper limits please? DiamondHD4850.bin

Here's your Diamond HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 950MHz
Mem upper limit 1400MHz

[Mysterfix]

Thanks bro.

[leonarderman]

You should create an USB Bootable to Dos. You can make it from the guide here:

http://www.thepcspy.com/read/bootable_usb_flash_drive

Then you have to copy ATIFlash programs 3.6 (download below) or newer (Dos) and Bios file to USB Disk. Try it done!

http://www.techpowerup.com/downloads...lash_3.60.html


Please note: Updating by ATIFlash 3.6 or newer (Dos), don't try to use ATI WinFlash, because I found the problem from bios file maked by RBE1.12 - ATI Winflash can't open bios file maked by RBE1.12!

[MadMikeSS]

Here's your HIS HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 800MHz
Mem upper limit 1300MHz

Thanks bud, you are the man.

[BulldogPO]

Please, do one for MSI HD4850 also

[Factotum]

leonarderman
May be You can write "How to" with pictures for All, pls

[Factotum]

yes, i'm do it. I convert in calcularor 70000 (Dec)-> 11170 (Hex)
open bios in winhex end find hex value 701101 - i'm find a value
edit 701101 (700MHz) -> 187301 (950MHz), check checksum and save bios
RBE say what clock upper limit set to 950MHz
i'm flashing the bios nice, but catalist 8.8 don'd work with bios

[leonarderman]

yes, i'm do it. I convert in calcularor 70000 (Dec)-> 11170 (Hex)
open bios in winhex end find hex value 701101 - i'm find a value
edit 701101 (700MHz) -> 187301 (950MHz), check checksum and save bios
RBE say what clock upper limit set to 950MHz
i'm flashing the bios nice, but catalist 8.8 don'd work with bios

Yes! Catalyst 8.8 can't Overclock card with ATI Overdrive, you should OC with AMD GPU Tool.

[STEvil]

Why so many different limits and versions?

Just open them up to a high value (1200 core+) but leave the volts/clocks at default.

[leonarderman]

Please, do one for MSI HD4850 also

Your MSI Bios modded here

Core upper limit 950Mhz
Mem upper limit 1400MHz

And I don't change anything else!



@ STEvil : do you thing you can overclock GPU HD4800 more than 1200MHz? The WR is 1050MHz with hard modded! I thing 950Mhz are enough!

[Factotum]

Yes! Catalyst 8.8 can't Overclock card with ATI Overdrive, you should OC with AMD GPU Tool.

Catalist 8.7:

[drizzt5]

I think my S1 + 120mm fan should be enough to get me a decent overclock.

[STEvil]

Your MSI Bios modded here

Core upper limit 950Mhz
Mem upper limit 1400MHz

And I don't change anything else!



@ STEvil : do you thing you can overclock GPU HD4800 more than 1200MHz? The WR is 1050MHz with hard modded! I thing 950Mhz are enough!

If the WR is 1050 then 950 is not enough.

Edit - and i'm sure i've seen some at 1100.

[stingush]

can some1 link me to the pencil mod?

[leonarderman]

can some1 link me to the pencil mod?

It can be found here!
http://www.techpowerup.com/articles/...g/voltmods/151

@ STEvil: That's so good! Try to top WR. Good luck!

I could just overclock my to 815MHz with pencil Vcore modded. The card is so hot that I couldnot overclock more than that! Here is my result 3DMark Vantage Performace.

[drizzt5]

Thanks man, you used your bios mod + your pencil mod right?