4890 OC limit fixed!

[SF3D]

Hi all!

THERE WILL BE NO DOWNLOAD LINKS AT THIS POINT AND PLEASE DO NOT PM ME ABOUT THIS (This should not be offending, if someone find it that way)

We have been doing some work to solve the problem in 4890 overclocking. We all have seen this issue, when we have tried to push our 4890 cards higher.

We got new bios with requested fixes to test few days a go and I decided to try it out today with my dual head CF/SLI single stage.

Temperatures were like under -30C on load and -40c on idle, so much more is coming when I will put these cards under LN2

I have no info when this bios will be officially released, but it will happen sooner or later.

See the results yourself:

Single card fillrate 1225MHz:


Single card 03 1200MHz (4890 record?)


Single card Vantage 1200MHz (4890 record?)


Maximum clock speed at -30c 1340MHz


Then I installed second 4890 in to the setup. This card is ES and it is not good clocker. (1030 on air)

Results:

Dual card fillrate 1200MHz


03 Dual cards at 1150MHz


Vantage, Dual cards at 1150MHz


I will get some better 4890 cards tomorrow and I will try to do some 05 and 06 scores with them. Let's hope, that the 975 will do at least 5.3GHz in 05

I'm satisfied if these cards will do at least 1.3GHz on LN2

Bench day will be thursday and hopefully my lucky mascot Massman will be helping me in here.

[ceemic]

SF3D, tnx for the info
But what Vgpu were You running?

[G.Foyle]

Argh, beat me by 101 pts in Vantage
I dunno how but I benched 1200/1200 on modded bios on dice with 1.425 V, without any problems

[SF3D]

You are extremely lucky. I hope you did win in lottery too

Some cards can scale up on core speed with cold, but it is very rare. Most cards did not do much over 1100MHz on LN2, so this is the issue we are talking here.

To ceemic. Better card 1.365V and worse card 1.4125V

[HousERaT]

looks interesting.

[SNiiPE_DoGG]

So I get the part about not releasing, but can you give some insight into the BIOS modification? I have heard that there is encryption that needs to be broken for proper unlock and other major changes to a bios and that BIOSes dont even work cross AIB in some cases.

[TiTON]

hmm.. very interesting.. So it wasn't my imagination that I couldn't get over 1100Mhz That is good to know. Now to wait for the BIOS to be available

- Ton

[chew*]

Interesting but I've known all along that software was not the way to clock these cards......bios fights with it..........so I hacked the hell out of my bios

That bios looks a tad better than my hack job however

[N3RO]

Sounds interesting

Lets see 130k+ on 2001 with ATI now

[stangracin3]

Interesting but I've known all along that software was not the way to clock these cards......bios fights with it..........so I hacked the hell out of my bios

That bios looks a tad better than my hack job however

it sure does lol

[SF3D]

Why this thread is moved to 3DMark info and support? The word info in the start does not mean that this is not Xtreme overclocking?

There was already two 4890 single card records in this thread and more is coming

Please kind moderator, move this back to the Xtreme 3D where it was

[Brandybuck]

My sapphire 4890 on ln2 1230mhz

[TiTON]

brandybuck,

I have sapphires also.. i need to check which bios version I have

Were those stock bios.. or did you tweak them?

- Ton

[Movieman]

Moved here on request of the OP..

[SF3D]

Brandy- What was the temperature and model of the card? Stock bios without mods and what was the core voltage?

This thread is not about these rare LN2 clocks. If 100/100 cards would do 1200MHz on LN2 out of the box, then this thread would be worthless

When this bios will be in public use, we will see some sick overclokcs for sure.

[perkam]

Holy Sh-- !!!!!!

Nice

Perkam

[chew*]

brandybuck,

I have sapphires also.. i need to check which bios version I have

Were those stock bios.. or did you tweak them?

- Ton

thats software

Single card you can get away with that.......quadfire no dice. I can pull 1100/1300 in quadfire though because I dont use software

[Brandybuck]

brandybuck,

I have sapphires also.. i need to check which bios version I have

Were those stock bios.. or did you tweak them?

- Ton

Yes I use stock bios not tweaked

Brandy- What was the temperature and model of the card? Stock bios without mods and what was the core voltage?

This thread is not about these rare LN2 clocks. If 100/100 cards would do 1200MHz on LN2 out of the box, then this thread would be worthless

When this bios will be in public use, we will see some sick overclokcs for sure.

I run -120C 1.48v with this speed

[Hazzan]

Nice info and sharing.... so for now we just wait officila bios realised and see for your test

[G H Z]

Looks good SF! Running over 1200/1200 in CF is not easy with these cards

[purecain]

new bios coming.... hmmm very good news... good luck with the ln2 bench SF3D......

[ILikeCosmosS]

looks great now i wonder if xfx cards will clock this far

[Vivi]

Now to wait for the BIOS to be available
- Ton

look at 295 mod. it wont become avail to the public

great clocks sf3d

[TheKarmakazi]

very nice please let every1 know as soon as this bios is made public!

[TheKarmakazi]

look at 295 mod. it wont become avail to the public

great clocks sf3d

Slightly different situation though Goddy. GTX295's VT1165 is a voltage reg protected by NDA for any pin out info etc. Anyone revealing it would stand to be sued by Volterra. And they do prosecute its happened before