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

[AndrewZorn]

1) yes, but afterburner works on any 5850
2) input vgpu into gpu register box, DO NOT change in the clock boxes or in the overclock wizard dialog box. You'll break powerplay if you do.
3) use the clock wizard rather than editing the boxes directly.

afterburner wont let me edit voltage on my card... i thought that was because it wasnt MSI. i guess i will stick with Asus. but it doesnt matter, right?

ok found GPU registers now, makes sense, i just got worried when i didnt see the list. so i just replace the other normal-high voltage (0x17) (1.087v) with what i want (1.175v)?
when i do that, even after saving the bios, i notice this does not update the voltage listed in Clock info 00, 01, etc... this is normal? the new voltage i put in 0x17 will take command?

...so no real way to use this to get rid of having CCC control powerplay?
if i cant get rid of CCC and still use powerplay, i mind as well just do the overclocking within CCC for safety.



thanks!

[2slick4u]

how much can you overclock using stock cooler?

[Gaul]

5870 oc + 98gtx ( as physic )

[gergregg]

Added an EK FC block to the 5850 and got this at 1075 core 1275 mem 1.3v.

Not done playing yet.

Update: Here is another at 1085/1275/1.325

[Zeus]

2x Sapphire 5770 flashed with Asus bios, cooled by EK fullcover blocks:



1.35Vgpu

[Particle]

That OC chart is outright depressing. I've been fighting with 950MHz on my 5850. Even 1.27V isn't stable in all games. That puts me squarely as the worst 5850 here.

[mattlef]

This will actually be my first attempt at flashing a gpu bios. i've always just used overdrive within the limits of the locked bios for overclocking.
Does anyone have a modified 5850 bios thats stable with GPU core @ 900mhz?
Basically, I have no idea how to use RBE.... any help would be awesome.

As well, should one look into a different cooling solution? the stock fan on this xfx 5850 is loud as hell.

[AndrewZorn]

actually, the one i used was posted in this thread
but the bios wont necessarily make your gpu stable at 900mhz
it is just unlocked so you can use CCC to take it to 900mhz if you can

[mattlef]

actually, the one i used was posted in this thread
but the bios wont necessarily make your gpu stable at 900mhz
it is just unlocked so you can use CCC to take it to 900mhz if you can

Does power play still work?
I want to make sure my GPU downclocks when in 2d mode.

[AndrewZorn]

yes, it is what i am using now
you flash the card, and everything is the same except it says asus and the CCC limits are 1200/1400 instead of 775/1125
need to reinstall drivers though

[mattlef]

I finally got a decently stable OC...
this xfx 5850 is touchy as hell.

940/1200 1.2v

[jlewis02]

My XFX5850 BE is a pos for clocking high.
My max so far is 920/1200 1.2v it just craps out on me after that.

[gerardfraser]

Not a big Overclocker just like gaming. 5970+5850 coreI7 920@4095 mhz
5850 needs 1.31 volts 1000/1200
5970 needs 1.2 volts 1000/1200
Benches are with everyday clocks now and all on air.

[mattlef]

damn, my oc wasnt furmark stable.
I had to back it down to 920/1110 w fan @ 38%.... idles at 28c.... loads at ouch lol 84c lol

seems that the ram is presenting a bit of an issue :S

http://www.techpowerup.com/gpuz/b4u82/

[Muraretu]

In 3DMark 2006 and in all video games my Sapphire HD5850(BBA) is stable in 1000/1200 @ 1.2V but in Furmark temperature on VDDC Phases 1, 2, 3 go to 120 C and freezes.I use the original bios modified with RBE. What should I do?

[AndrewZorn]

lower the voltage?

[GregUMR]

That OC chart is outright depressing. I've been fighting with 950MHz on my 5850. Even 1.27V isn't stable in all games. That puts me squarely as the worst 5850 here.

Man I'm with you, I've got 950/1200 stable at 1.28V right now, but 1000/1200 seems like a pipe dream. At 1.35 its not stable with 3dmark vantage or ati-tool.... Scares me because I wanted to get another 5850 at some point but it looks like I'll have to stick at the common denominator of 950/1200 even if the new card does 1050/1300.... blah... Maybe I'll just get a 5970?

[Musho]

That OC chart is outright depressing. I've been fighting with 950MHz on my 5850. Even 1.27V isn't stable in all games. That puts me squarely as the worst 5850 here.

What PSU and mobo are you using? It could be affecting your maximum stable clocks?

[ZL1Killa]

if something is getting hot or the overclock isn't ok, will you get freezing & flickers across the screen?

[demowhc]

Hey guys just thought I'd share my oc'ing experiences with 5850 CF

using Afterburner I managed to get both cards upto 945/1200 @ 1.22v but dropped them back to 925/1200, everything seemed fine, vantage ran np, crysis, bad company 2 etc etc all run great, except I noticed in N:Total War that I get severe microstuttering, when I drop the clocks back to 775/1125 (CCC limit) there is no more microstuttering..
I think the Over Current protection is kicking in and tbh I suspect that a lot of people that think they have these insanely high oc's are infact getting errors but just dont know it, its very hard to tell apart from a little stutter here and there or lower performance..


So I'm a little confused, should I drop my oc because of that one title, which probably proves that my oc was never infact stable, or becasue everything else seems to run fine I should leave it.. but then again how will I know if Im getting true performance in game or if there happens to be a little stutter that it isnt caused by Over Current Protection?

[nikolas61]

A little play on the air and new WR for ATI 5850



3DMark Vantage - Performance....23622

ASUS 5850 @1055/1266

i7 980X@4611MHz

[zpaf]

Hello there to all.
This is my vantage score with default vcore 1.125 on air.

[AndrewZorn]

does everyone buy 3dmark vantage?

[gergregg]

does everyone buy 3dmark vantage?

I did, it's pretty cheap.

[Dahmer]

960 / 1250 is the highest so far that I didn't get artifacts with furmark but 3dmark03 failed.
900 / 1200 is what I play with right now and I think my power supply is giving me problems....either that or ty unstable power in this house, needs a big checkup.

Current power supply : Corsair 620HX
New power supply coming : Corsair 750HX (going to use an 8800GT for physx)