5850 core clock. - page 2. | Bitcointalksearch.org

Starlightbreaker

legendary

Activity: 1764

Merit: 1006

Quote from: teukon on August 08, 2011, 05:28:32 PM

I found my old post about my personal best MH/s for a 5850. 461.1 MH/s at 1110 MHz core clock, 3 hours continuous with very few stales.

Higher clocks such as 1140 MHz were fine for a short time but after 30 seconds or so the cards cut out due to high temperatures. I couldn't find a way to circumvent this so I guess (I have no water-cooling).

As I said before, I don't run at these speeds normally - this is just a bit of fun. The same card is now running at 377.5 MH/s (899MHz/[email protected]) and I'm trying to get my miner up to 2.5 MH/J.

0.9875?
whoa.
that's quite an undervoltage. what's the temperature?

PcChip

sr. member

Activity: 418

Merit: 250

I wonder if the cards were cutting out due to GPU temps or VRM temps?

If it's not a reference cooler (in which the heatsink contacts the VRM's via thermal pads), maybe try using arctic cermique (sp?) to glue on some small heatsinks to the VRM's

teukon

legendary

Activity: 1246

Merit: 1011

I found my old post about my personal best MH/s for a 5850. 461.1 MH/s at 1110 MHz core clock, 3 hours continuous with very few stales.

Higher clocks such as 1140 MHz were fine for a short time but after 30 seconds or so the cards cut out due to high temperatures. I couldn't find a way to circumvent this so I guess (I have no water-cooling).

As I said before, I don't run at these speeds normally - this is just a bit of fun. The same card is now running at 377.5 MH/s (899MHz/[email protected]) and I'm trying to get my miner up to 2.5 MH/J.

zx9r

full member

Activity: 153

Merit: 100

I have my 3x5880 at 950/300/1088 giving 389 Mhash/s with Linux (using atitweak) and perfectly stable.

I have the feeling that I can go more far away with them, they are only at 69ºC with the fan at 70% but I care for the PS. It is a Corsair GS 800. Do you think I can go higher with it ?

SMOKEU

member

Activity: 495

Merit: 10

📱 CARTESI 📱 INFRASTRUCTURE FOR DAP

The only thing I don't like about Trixx is the fact that it keeps setting the fan speed back to default every time I restart my computer instead of using the custom fan profile I setup.

It saves my fan profile, but I have to manually click the custom fan profile setting because otherwise my card overheats on the stock fan profile. That's the only reason why I don't use Trixx.

Elder III

sr. member

Activity: 1246

Merit: 274

^me too, but I never have much success with Afterburner, at least not for multiple GPU systems. Trixx on the other hand seems to work well for me, it's cleaner and simpler too, which I like....

mike678

full member

Activity: 182

Merit: 100

I'm curious what would cause afterburner to not work but trixx to work perfectly fine?

PcChip

sr. member

Activity: 418

Merit: 250

Usually for me, if Afterburner won't work, TriXX will. The combination of both usually will let me tackle any problem (except my third dedicated rig, which has crossfired 5770's... for that I'm experimenting with BarelyClocked, and it seems to be a VERY powerful commandline tool, possibly written by a bitcoin forum member)

mike678

full member

Activity: 182

Merit: 100

I tried trixx again since I changed to 11.7 yesterday and haven't tried trixx since the change. That fixed everything. I still cant use afterburner though it makes the cards extremely unstable. I'm running at 940/325 and I get 390 Cheesy

STP

jr. member

Activity: 47

Merit: 12

Quote from: mike678 on August 07, 2011, 01:18:33 PM

Yea I just got the sapphire extremes from ncixus for 145. Anything below 500 tends to freeze the entire computer Sad

You say the new bios for the 5850 may be more restrictive? How hard would it be to flash to an older version and would I risk bricking them?

I got mine from them in that last batch as well. No problems here on 300. So far these cards let me throttle them at will long as they have ample voltage.

teukon

legendary

Activity: 1246

Merit: 1011

Quote from: mike678 on August 07, 2011, 01:18:33 PM

Yea I just got the sapphire extremes from ncixus for 145. Anything below 500 tends to freeze the entire computer Sad

You say the new bios for the 5850 may be more restrictive? How hard would it be to flash to an older version and would I risk bricking them?

I'm genuinely surprised that low RAM clocks cause your computer to freeze. It doesn't seem logical to me and runs contrary to the collective experience of the forum members. Are there any other programs using your cards? Is one of your cards driving a window manager for example? Have you tried lowering the RAM clock on a card which is not being used by any programs?

I'm not the best guy to ask about flashing BIOSes and just try to do the best I can with the given BIOS. There was a time when I was limited to 900 MHz core clock which was very frustrating but flashing the BIOS was simply too much work to be worth doing.

Best of luck.

Niann

hero member

Activity: 691

Merit: 511

Some cards have way more safeguards than others, the XFX for instance is a pain to overclock..

Try MSI afterburner and TRIXX, if you are not able to do it, flash your BIOS, but be sure to know
what you are doing, because you are going to void the warranty of your card.

Cool

mike678

full member

Activity: 182

Merit: 100

Yea I just got the sapphire extremes from ncixus for 145. Anything below 500 tends to freeze the entire computer Sad

You say the new bios for the 5850 may be more restrictive? How hard would it be to flash to an older version and would I risk bricking them?

teukon

legendary

Activity: 1246

Merit: 1011

Quote from: STP on August 07, 2011, 12:19:28 PM

Quote from: mike678 on August 07, 2011, 09:56:53 AM

Do you guys have to change the voltage to get the memory so low? On stock voltages I have a really hard time with anything less then 500.

I ran 900/300 on stock voltage. I have the Sapphire extremes if that makes any difference. Card was stable and started to crash driver in the 900-925 range. Lowering memory on the other hand has never made it unstable for me.

My cards run fine with the RAM at just 50MHz with no change in voltage. I doubt there are stability issues with low RAM clocks.

I'm assuming you're having difficulty setting a low RAM clock speed in the first place. For this I use AMDOverdriveCtrl. I create a simple overdrive profile such as

Code:

and then apply the profile to the card with the command

Code:

AMDOverdriveCtrl -b MyProfile.ovdr -i 0

I imagine in Windows this would be even easier. I found it was necessary to give the same RAM clock speeds for all three performance levels for the setting to apply. I don't think AMDOverdriveCtrl can handle lower performance levels to have higher RAM clock speeds but I could be wrong.

My cards are also Sapphire Xtreme's but they are a few months old which might make a difference. I've heard that the latest BIOSes Sapphire have put on their cards are more restrictive.

STP

jr. member

Activity: 47

Merit: 12

Quote from: mike678 on August 07, 2011, 09:56:53 AM

Do you guys have to change the voltage to get the memory so low? On stock voltages I have a really hard time with anything less then 500.

I ran 900/300 on stock voltage. I have the Sapphire extremes if that makes any difference. Card was stable and started to crash driver in the 900-925 range. Lowering memory on the other hand has never made it unstable for me.

mike678

full member

Activity: 182

Merit: 100

Do you guys have to change the voltage to get the memory so low? On stock voltages I have a really hard time with anything less then 500.

STP

jr. member

Activity: 47

Merit: 12

I am running my 5850's at 950/300 1.115v and pulling 390 mh/s.

teukon

legendary

Activity: 1246

Merit: 1011

In testing I got my 5850 over 460 MH/s (can't remember the exact figure) at 1110 MHz core clock, 370 MHz RAM, 1.25V. I can't vouch for the long term stability of my settings (I managed a continuous 3 hour run and then the card crashed immediately when I started mining on an adjacent card).

These days the same card is giving me 373.1 MH/s (890 MHz core, 300 MHz RAM, 0.9875V). I haven't tried the Catalyst 11.7 or SDK 2.5 yet as I've been away for 2 weeks. I personally prefer the lower voltage and my dual 5850 rig is currently running at 300W, giving me about 2.43 MH/J.

edtks86

newbie

Activity: 26

Merit: 0

I'm running 900/300 getting 380Mhash

Niann

hero member

Activity: 691

Merit: 511

Actually most ppl run over 900 mhz o.o
Normally that is.

Topic: 5850 core clock. - page 2. (Read 4061 times)