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

[Mungri]

Windows 7 makes a difference for me

P18168

[..::G80::..]

With afterburner and AMD clocktool, is it possible overclock 3x5870?
Two cards arrive today and some LN2.

yesterday I tested my first card and, it did 1.23V 1025MHz core.

[Oese]

u better only use afterburner, gpu tool is crap. afterburner can oc multiple gpu's, but 900mhz limit is there with other then asus or msi bios....

[gergregg]

Still playing around waiting for my waterblock to be available.

5850
1.275v
1050 core
1250 mem
Stock cooling

vantage GPU 18273

[Utnorris]

Nice job! Wait till you get your water block, I bet 1100 will be easy for you.

[Gaul]

P 17.200

Q66 @ 4 GH + 5870 @ 1000/1350

[pr@$r1g]

"sweet sweet sweet " there a hell lot of going on here ...........................

why has AMD set core clock @ 850 they should made it default to 1000 for core & with that many of u would have gone 1200 & above ^...........................

[Lightman]

"sweet sweet sweet " there a hell lot of going on here ...........................

why has AMD set core clock @ 850 they should made it default to 1000 for core & with that many of u would have gone 1200 & above ^...........................

Probably TDP reasons ...

I love how easy is to get 1GHz core on this card! Memory though is another topic...

Anyone know if memory voltage can be adjusted via software on HD5870??

[Utnorris]

That's a good question, but I bet it will have to be a hard mod for the memory. Should help push the memory past the 1300 marker.

[SonDa5]

Windows 7 makes a difference for me

P18168

Good looking score for Xfired HD5770s.
Is that as fast as your HD5770s will go?
Think you can increase that score?

[Blkout]

Probably TDP reasons ...

I love how easy is to get 1GHz core on this card! Memory though is another topic...

Anyone know if memory voltage can be adjusted via software on HD5870??

I don't think anyone has had any problems pushing the memory to 1300MHz and shouldn't really need to go any higher, that's more than enough bandwidth. Core overclocking makes far more difference.

[CornerJack]

i870@4GHz + 5870 1150/1351MHz with 1.35v LN²

[ACEkombatkiwi]

Hi guys,

Finally got my pair of Sapphire 5870's after 3 weeks of waiting, i have to say it was worth it no doubt. First thing i did was flash the bios with the MSI.rom it was pretty straight forward but i was a bit worried considering it was my first time doing it (could have been a couple of expensive paper weights). Didn't take me long though till i got frustrated and annoyed that I could not get the cards stable @ the magic 1GHz considering i have been following this thread for a while now and seeing how many of you have.

Have a look at the Excel data i collected my card hates any extra voltage over stock and just gets worse as the voltage is increased.

I have got a lot more to say but i have been up for 40hrs and really need some sleep so i will just let my screen shot do the talking.

I am a bit worried that my Enermax85+ 850w isn't going to be enough for my setup what do you guys think.

Will follow up with more benchies tomorrow.

[spajdr]

Enermax85+ 850W? That PSU can take even three 5870 cards easily.

[dnottis]

Probably TDP reasons ...

I love how easy is to get 1GHz core on this card! Memory though is another topic...

Anyone know if memory voltage can be adjusted via software on HD5870??

There is no real reason to push ram past ~1250 since performance is about the same as 1300 mhz. Over 1300 performance decreases. Push the core, leave the memory @ 1300Mhz.

[TheBlueChanell]

Here's my latest run.

More info here: http://www.xtremesystems.org/forums/...=235831&page=2

[ACEkombatkiwi]

Hey guys

core i7 975@4GHz/ Sapphire 5870@925/1288 (24/7),1040/1300 (max)

Back again after some well deserved sleep as promised i have a few more benchies for you.

All are on max quality with no AA @ 1920x1080 single card only for now still need to run the crossfire tests.

Call of Jurez
min:42
avg:88
max:171
min:44
avg:96
max:197

Crysis
min:20
avg:29
max:43
min:22
avg:33
max:48

Resident Evil 5
min:92
avg:112.5
max:171
min:99
avg:122.7
max:198

Vantage Performance Preset
CPU:24485
GPU:17296
3DMARK SCORE:18666
CPU:24293
GPU:18761
3DMARK SCORE:19894

[CornerJack]

i870@4.2GHz + Asus 5870 Tweak Voltage 1198/1301MHz 1.35v under LN² -45°C
Impossible to have 1201MHz because bios limited ? or AfterBurner...

[Astennu]

That is exactly what I thought, that these cards were bandwidth limited so the ram increases should have helped, but they dont. It seems to be overclocking the GPU on them that makes them a lot better. I would like to be able to get them to 1 Ghz.

I think the ram timings mess up above 1300 Mhz or something, because something causes it to loose prformance at 1350 Mhz.

I'll look for the Far Cry II benchmark now, I dont play FPS games but will see if I can get the benchmark. I've kept the cards clocked at 960 / 1300 for to test for stability in games, and they've been fine in a few MMO's, but I had to increase the voltage slightly from 1.13v to 1.16v to stop the display driver from crashing.

I think the 5770 is currently so much slower then the 4870 due to immature drivers, at least overclocking it brings it up to par with the 4800's somehow. One way to test would be underclock a 4870's ram down to half the clock of the 5770 so both have the same bandwith, while underclocking the 5770 GPU to the same as the 4870, but my 4870's are already wrapped up ready to post so Im not doing that.

Seems like I cant get the FC2 benchmark without buying the game, so I cant do that.

Thats what i thought aswell. It could be the drivers. And you see that in some games its on par with the 4870. Lowering the ram clocks that much on a 4870 would not be fair. Yes you have the same bandwith. But the MC's are made for faster ram. Its possible that you see a huge drop in performance because the MC can not perform well on those speeds.

+ RV840 is not a RV770 with DX11. More changed. They took out some GPGPU capability's that the RV7x0 and the RV870 do have.

Its realy a GPU for gamers. But that should not cause games to slow down.

But i think we will see a 10-20% boost for the RV8xx cards that the RV7xx wont get. + with DX11 you can also have a 25% boost in performance vs DX10.1, better image quality or a combination of both..... So in the future i think the HD5770 will perform on HD4890 levels but then with a lot more features on it.

[pr@$r1g]

i870@4.2GHz + Asus 5870 Tweak Voltage 1198/1301MHz 1.35v under LN² -45°C
Impossible to have 1201MHz because bios limited ? or AfterBurner...

thats what i will never be able to do

[Mungri]

As a few people have said above, something messes up on these cards when overclocking the ram over 1300, to the point that 1450 Mhz performs the same as 1300, and the difference between 1250 and 1300 is tiny.

For benchmarking, you can try running 1300 on 5800s, and 1450 on 5700's, but for everyday use it is best to keep them at 1250 which all of them should easilly handle as that is the rated speed on the ram chips.

The best thing to do for benching and overall performance is to OC the GPU as far as it will go.

The 5770 is ideal for gamers, it just needs to be clocked to 950 / 1250 to bring it up to 4800 performance, then the 5800s are good for enthusiasts, rich people, or anyone playing far above 1920x1200.

It would also be a good idea to wait for factory overclocked 5770s, because I have seen a lot of reviews where they couldnt reach 950 Mhz on them, but maybe because they werent increasing stock volts.

With the 5800s, just buy any and get OC'ing and modding it however you like :p.


I flashed my cards to the Asus bios:



Testing for higher clocks now

I get artifacts at 1050 Mhz, and complete system crash at 1100, so it looks like I'll be sticking to 1000, which is very decent enough

[SonDa5]

Testing for higher clocks now

I get artifacts at 1050 Mhz, and complete system crash at 1100, so it looks like I'll be sticking to 1000, which is very decent enough

Looks toasty. Crank up the fan and run some Vantage and 3dMark06 benchmarks when you get it tuned right. Please.

[Mungri]

I havnt benched at 1000 Mhz yet, and my screen gets covered in artifacts after a while of gaming, looks like the stock cooler cant handle them going that high so I've reduced them back down to 950 Mhz.

Looks like I'll have to install my Thermaltake S orbs on them soon.

I'm too busy playing battleforge atm, but 1000+ Mhz will need better aftermarket coolers, which I already have

Stock cooler can only handle up to 960 Mhz it seems.

[SonDa5]

I havnt benched at 1000 Mhz yet, and my screen gets covered in artifacts after a while of gaming, looks like the stock cooler cant handle them going that high so I've reduced them back down to 950 Mhz.

Looks like I'll have to install my Thermaltake S orbs on them soon.

I'm too busy playing battleforge atm, but 1000+ Mhz will need better aftermarket coolers, which I already have

Stock cooler can only handle up to 960 Mhz it seems.

Good to know.

Between single HD5850 and HD5770 Xfire which do you think is better? Why?

[jaredpace]

Some more 5850 OC performance with wattage (28% performance increase) numbers:

Crysis
2048*1152 8*aa , very high

idle 157/300
122w

725/1000 1,088v
29fps 270w

775/1125 1,088(ccc max)
31-32fps 280w

820/1200 1,088
33-34fps 285w

850/1220 1,1
34fps 294w

900/1220 1,2v
35fps 325w

950/1220 1,2v
36fps 330w

1000/1220 1,3v
37fps 370w

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