*** Official Radeon HD5800 Series Overclocking Thread ***

[Zeus]

1.35V is the hard limit for AfterBurner unless you know ways around it.

It was MSI's decision to limit AB to 1.35V, just to prevent a rain of rma'd cards.

[R_1]

And they did it for a good reason. Stock cooling don't have much headroom for overclocking in high ambient temps and a overvolted card can be easily overheated.

...
Havent tried more than 1.35 as thats what MSI Afterburner allows and I cant push Core past 1045 so I need more juice temps not high anyway wiht 100% fanspeed and extra fan at exaust and intake...

Unless you are living in arctic igloo voltages above 1.35V will fry your GPU. So, just to be on the safe side consider buying high performance water-cooling like Zeus did.

[strange|ife]

been looking over this thread. bout to squeez trigger on this sapphire vapor x 5850. I read some comments on egg and another site, that recently the pcb was switched over to one with weaker vrms or something i forget. Im looking to do at least 950 on the core with stock voltage, not interested in flashing a MSI or other bios onto the card.

anyone know if this revision is decent

http://www.newegg.com/Product/Produc...82E16814102886

[muggy]

950 on stock voltage doesn't sound all that likely to me, but I'm sure some cards could do it.

been looking over this thread. bout to squeez trigger on this sapphire vapor x 5850. I read some comments on egg and another site, that recently the pcb was switched over to one with weaker vrms or something i forget. Im looking to do at least 950 on the core with stock voltage, not interested in flashing a MSI or other bios onto the card.

anyone know if this revision is decent

http://www.newegg.com/Product/Produc...82E16814102886

[strange|ife]

950 on stock voltage doesn't sound all that likely to me, but I'm sure some cards could do it.

yeah not holding my breathe. I have seen some clock that high at less than 1.2v on refrence boards, early 5850. This one i guess isn't Ref.

I have been out of the loop honestly, so busy this past year with work..hard to keep with video card Revisions LOL. I'm gonna buy it and see what i can do. I Game, dont really care for 3Dmark scores. So long as it goes over 800 core i will be happy, these cards will eat and spit out most any game at stock speeds..that extra 13% is just icing on the cake.

[Razrback16]

Great thread fellas.
Not sure how to take pics of my desktop and convert to .jpg but here is a pic of my card -- reference HIS 5870 with EK FC5870 Waterblock. Conservative overclock -- running 1.25v - 1000MHz/1250MHz -- I haven't tried pushing beyond either of those clocks to see if it would go higher. I have been told that the memory is tough to know when it's beyond its spec because it doesn't show artifacts? I wonder how much voltage I would need to hit 1050MHz core stable.