Gigabyte HD3870 MOd Unlocked | 900/2100Mhz AiR cooled

**ceemic** · 02-20-2008, 05:39 AM

Barr3l Rid3r, nice! Can You please do a high-res macro pic from Your mod? It seems like I have misunderstood the right vmod point: http://ceemic.pri.ee/hardware/hd3870/hd3870_13_1.jpg
100k VR? Why not Vmem mod?

What's the lowest Vgpu You can get with mod? ~1,4xV?

EDIT: what cooler is that?

**Barr3l Rid3r** · 02-20-2008, 09:31 AM

Used 200k trim, solder points is the same of others.

w/ Sapphire Bios Original 3D @ 1.22V I got 1.42V in 3D mode
w/ Sapphire Bios MOD 3D @ 1.32V I got 1.50V in 3DMode

Cooler - Volcano 10+ Slim.

**ceemic** · 02-20-2008, 09:45 AM

That missing res. was mistaken me

http://ceemic.pri.ee/hardware/hd3870/hd3870_13_1.jpg that is right I hope...

**Barr3l Rid3r** · 02-20-2008, 10:42 AM

Originally Posted by ceemic

That missing res. was mistaken me

http://ceemic.pri.ee/hardware/hd3870/hd3870_13_1.jpg that is right I hope...

Right

**MadCow809** · 02-21-2008, 03:51 AM

hi, sorry to deviate from the main topic a bit.

i have a GeCube HD3850 512mb, and it OCs quite well, i was thinking.. would it be possible for me to flash it to a 3870?? I dont think my card can take some of the 3870 oc BIOS, or is there a way for me to set my own clock speed in the bios?

thanks

**lowtcell** · 02-21-2008, 06:23 AM

Hi MadCow, welcome to XS.

Look in this thread for the Bios editor http://www.xtremesystems.org/forums/...d.php?t=175531. This will allow you to set your own clocks and voltages to a point. On my Sapphire 3850, the actual voltage would not go up over 1.241 volts (stock is 1.214) no matter how high I set it. Depending on how high you want to go with your clocks, you may need to do a VoltMod on your card http://www.xtremesystems.org/forums/...d.php?t=166623

**Barr3l Rid3r** · 02-21-2008, 09:36 AM

Originally Posted by MadCow809

hi, sorry to deviate from the main topic a bit.

i have a GeCube HD3850 512mb, and it OCs quite well, i was thinking.. would it be possible for me to flash it to a 3870?? I dont think my card can take some of the 3870 oc BIOS, or is there a way for me to set my own clock speed in the bios?

thanks

Nope, the only bios for 3870 w/ DDR3 comes from mine gigabyte ultra durable and it is locked, that's why i changed it to an 3850 bios..

check out if yours is version 71 or higher then u don't need to change it, just save your own bios using ATi Winflash and edit w/ Computerbase bios editor to get max voltage avaible...

**~~TheKarmakazi~~** · 02-21-2008, 09:55 AM

Originally Posted by roadie

I am going to email Gigabyte to see if they can release an unlocked BIOS for the card so we can OC without voiding the warranty. Hopefully, they will work on it, as they have released an 8800GT with overvolting capabilities etc.

Can you point me to that 8800gt link/??? Would be mucho appreciado

**MadCow809** · 02-21-2008, 06:24 PM

Originally Posted by Barr3l Rid3r

Nope, the only bios for 3870 w/ DDR3 comes from mine gigabyte ultra durable and it is locked, that's why i changed it to an 3850 bios..

check out if yours is version 71 or higher then u don't need to change it, just save your own bios using ATi Winflash and edit w/ Computerbase bios editor to get max voltage avaible...

when you say locked bios, are you referring to the HD38x0 bios which doesnt OC past 860mhz? If thats the case, then dont worry, beacuse im not intending on clocking my card to that kind of speed. Right now im running 750/950 @ 39c with two 120mm fans blowing at the card. The card OCs to 800/1003 which is the max that ive done, im not planning on raising too much voltage so that locked BIOS does not really trouble me.

Having said that, is it safe for me to flash my card(gecube) to a gigabyte 3870 bios?

**raibemunn** · 02-22-2008, 05:24 AM

How bad would it be to flash my hynix equipped gigabyte HD 3850 with that Sapphire 3850 512MB DDR3 Qimonda Bios given in the first post.
And would I be able to recover from bad flash with vnc from another pc?

**Clint** · 02-22-2008, 06:14 AM

Originally Posted by raibemunn

How bad would it be to flash my hynix equipped gigabyte HD 3850 with that Sapphire 3850 512MB DDR3 Qimonda Bios given in the first post.
And would I be able to recover from bad flash with vnc from another pc?

If you first modified that bios to a lower clock on the memory it might just work, I've seen stranger things than that.

The voltage given is the same on both chips, so it will not burn for you.

Even if you get black screen you will most certainly be able to flash it back to original bios using another card.

**ceemic** · 02-22-2008, 02:15 PM

Still @zalman's crap in 21C ambient and no mod.
http://ceemic.pri.ee/45nm/77321.jpg
Did also 931MHz but I pushed mem to 1107, and it crashed middle 3D

Strange it shows def 670/830, when I flashed it with 780/950; also CCC Overdrive isn't working

**MadCow809** · 02-23-2008, 12:45 AM

Originally Posted by ceemic

Still @zalman's crap in 21C ambient and no mod.
http://ceemic.pri.ee/45nm/77321.jpg
Did also 931MHz but I pushed mem to 1107, and it crashed middle 3D

Strange it shows def 670/830, when I flashed it with 780/950; also CCC Overdrive isn't working

Overdrive wont work because 780/950 is way pasted the HD3850's normal speed range.

ATI Overdrive only detects up to 735/950, you will need to flash it to 3870 to detect the OCed speed.

**ceemic** · 02-23-2008, 04:59 AM

MadCow809, thanks. CCC sucks anyway

Little update w/ 10C ambient: http://ceemic.pri.ee/45nm/78037.jpg

**Barr3l Rid3r** · 02-24-2008, 06:01 PM

Originally Posted by ceemic

MadCow809, thanks. CCC sucks anyway

Little update w/ 10C ambient: http://ceemic.pri.ee/45nm/78037.jpg

]

931 w/ not even a pencil mod?

**raibemunn** · 02-25-2008, 12:10 AM

Originally Posted by Clint

If you first modified that bios to a lower clock on the memory it might just work, I've seen stranger things than that.

The voltage given is the same on both chips, so it will not burn for you.

Even if you get black screen you will most certainly be able to flash it back to original bios using another card.

Well, those hynix chips can take 900+ and clock is set to 800 something.
What about checksums. I mean, would it work if i just download and flash it, or i have to modify its checksum to make it work?

**Clint** · 02-25-2008, 02:31 AM

Originally Posted by raibemunn

Well, those hynix chips can take 900+ and clock is set to 800 something.
What about checksums. I mean, would it work if i just download and flash it, or i have to modify its checksum to make it work?

Nah, checksum on that bios is ok I believe.
You need only to worry about cheksum when you start hex'ing the bios yourself.

The ATI 38xx BIOS editor will adjust for checksum for you as well, so if you edit clocks with that you need not to worry.

**ceemic** · 02-25-2008, 02:44 AM

Barr3l Rid3r, yep, no mods

Just ~8C ambient

I ordered 100k vr and will do the mod next week probably...

**MadCow809** · 02-25-2008, 04:53 AM

been testing my card for the past few days, stressing it with 3dmark and ati tool. looks like the card is pretty strong, it hasnt gone wrong yet.

ive decided not to flash my card to a gigabyte card incase i

it all up.

but its oh so tempting.... if any pros here thats clued up, please drop a reply.

thanks

**Clint** · 02-25-2008, 05:07 AM

Originally Posted by MadCow809

been testing my card for the past few days, stressing it with 3dmark and ati tool. looks like the card is pretty strong, it hasnt gone wrong yet.

ive decided not to flash my card to a gigabyte card incase i

it all up.

but its oh so tempting.... if any pros here thats clued up, please drop a reply.

thanks

You make no sense...

**Barr3l Rid3r** · 02-25-2008, 10:55 AM

what about samsung 1.0ns chips timing are more relaxed or thighter then hynix and qimonda...

**raibemunn** · 02-25-2008, 04:15 PM

Any idea where the vmem points are in thease pics http://ceemic.pri.ee/hardware/hd3870/ ?

edit: nvm, i flashed it with the sapphire bios.
i did edit the mem clocks in editor tho... to 700mhz just in case.
it works

just for reference, my card is gigabyte HD 3850 512MB ultra durable 2 with hynix 1.4 mems.
oh and mems volt is the same as before 1.83ish and i can still oc it to a stable 950mhz (havent tryied more)

**Clint** · 02-25-2008, 09:25 PM

Originally Posted by raibemunn

Any idea where the vmem points are in thease pics http://ceemic.pri.ee/hardware/hd3870/ ?

edit: nvm, i flashed it with the sapphire bios.
i did edit the mem clocks in editor tho... to 700mhz just in case.
it works

just for reference, my card is gigabyte HD 3850 512MB ultra durable 2 with hynix 1.4 mems.
oh and mems volt is the same as before 1.83ish and i can still oc it to a stable 950mhz (havent tryied more)

I assume the chips don't even get very hot?

Now, if you give the mems 2v or so you will see perhaps 1050MHz-1100Mhz I believe.
The Hynix 1.0ns version of the exact same chip is running at 2.05v...so it's even specced for it. (max rated voltage is 2.15v for this chip)

Hynix have simply binned down a better chip due to demand from producers with lower budget cards in mind.

What i voltage given to GPU now, and what is your max clocks?

I knew this was a good buy, I bought mine for 125€!

**Barr3l Rid3r** · 02-26-2008, 06:16 AM

Originally Posted by Clint

I assume the chips don't even get very hot?

Now, if you give the mems 2v or so you will see perhaps 1050MHz-1100Mhz I believe.
The Hynix 1.0ns version of the exact same chip is running at 2.05v...so it's even specced for it. (max rated voltage is 2.15v for this chip)

Hynix have simply binned down a better chip due to demand from producers with lower budget cards in mind.

What i voltage given to GPU now, and what is your max clocks?

I knew this was a good buy, I bought mine for 125€!

nice, I just wanna see if it can reach the same gpu frequency then 3870

mine reach 880Mhz stable @ 1.34v