is it safe to set core frequency to 300Mhz (Extreme) for avalon? - page 4.

Syke

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Quote from: allinvain on April 04, 2013, 10:07:53 AM

Quote from: luffy on April 04, 2013, 07:42:10 AM

282 --> 65 (590W, 220v)
300 --> 71 (640W, 220v)
i am running it stable at 300 without problems although it is a bit loudy

i am not sure about PSU, i haven't opened it, is it really 650W? Shocked

Hmm extra 50 watts for 300. I guess that will for sure overwhelm the Antec 650 watt PSU if one runs at 120v. I don't think I will try this until I slap on a 850 watt or 7500 watt Gold or Platinum rated PSU.

Don't confuse input wattage to output wattage. The PSU is rated at 650 watts output. When the input wattage is 640, the output more like 500-550 watts (depending on efficiency), so that's fine for a decent PSU.

Tyger

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Quote

Another thing is I have one avalon hashrate at 65G, another only 55G.

Both 282 mhz.

Looks like some chips are not working. an Avalon has 240 chips so thats 250mhz for each chip.
So i would say 20 chips are not working, weird that its exactly 20, maybe a part of a is not working.
A slot has 8 times 10 chips so maybe 2 sets of 10 not getting power? whats your power usage?

allinvain

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Quote from: caoxg on April 04, 2013, 10:49:38 AM

Quote from: allinvain on April 04, 2013, 10:09:17 AM

Quote from: caoxg on April 04, 2013, 09:19:05 AM

another one unlucky. 55G -> 56G only.

Are you running the latest firmware? And this happens no matter what clock rate the chips are running at? What do the temps say? Are the fans spinning at above 1000 rpm and can you feel the air flowing?

both the latest firmware of 0325. it seemd over clock doesn't help.
the temp3 are both 44. ( I have turn on air condition and set to 21 degree room temp.)

fans are 2200 rpm. air pressure are good. and I have additional cooling fans outside.

Everything are the same of both machine : same pool, same firmware, in the same room.

Hmm, odd. Everything seems ok. One thing tthat _might_ help is to make sure you do not have additional cooling fans outside the case blowing in. Leave the cooling setup as it came. This was a recommendation by ngzhang and I believe it is also mentioned in the official wiki.

You could also try opening the thing up and disconnecting and make sure everything is connected solidly and reconnect it if not.

caoxg

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Quote from: allinvain on April 04, 2013, 10:09:17 AM

Quote from: caoxg on April 04, 2013, 09:19:05 AM

another one unlucky. 55G -> 56G only.

Are you running the latest firmware? And this happens no matter what clock rate the chips are running at? What do the temps say? Are the fans spinning at above 1000 rpm and can you feel the air flowing?

both the latest firmware of 0325. it seemd over clock doesn't help.
the temp3 are both 44. ( I have turn on air condition and set to 21 degree room temp.)

fans are 2200 rpm. air pressure are good. and I have additional cooling fans outside.

Everything are the same of both machine : same pool, same firmware, in the same room.

allinvain

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Quote from: caoxg on April 04, 2013, 09:19:05 AM

another one unlucky. 55G -> 56G only.

Are you running the latest firmware? And this happens no matter what clock rate the chips are running at? What do the temps say? Are the fans spinning at above 1000 rpm and can you feel the air flowing?

allinvain

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Quote from: luffy on April 04, 2013, 07:42:10 AM

282 --> 65 (590W, 220v)
300 --> 71 (640W, 220v)
i am running it stable at 300 without problems although it is a bit loudy

i am not sure about PSU, i haven't opened it, is it really 650W? Shocked

Hmm extra 50 watts for 300. I guess that will for sure overwhelm the Antec 650 watt PSU if one runs at 120v. I don't think I will try this until I slap on a 850 watt or 7500 watt Gold or Platinum rated PSU.

allinvain

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Quote from: sgravina on April 04, 2013, 05:56:36 AM

Quote from: caoxg on April 04, 2013, 01:07:35 AM

the default is 282, and hashrate is 60G.

Does anyone tried to set it to 300?

I tried mine at 300 for about 20 minutes. The hash rate and the shares submitted didn't change. So I put it back to 282. My unit was in a cold room, 0 C.

The thing is running so well that I am loath to mess with it. I have a better spot to put it but I don't want to turn it off.

lol I'm in the same situation. I think a good investment would be to put it on a UPS. I got my eyes on a 1500VA unit - should be more than enough juice to keep it mining during brief power outages.

caoxg

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another one unlucky. 55G -> 56G only.

caoxg

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thanks.
I just tried with 1 avalon, it's 66G -> 72G .
looks stable. the temp is 42 -> 44
and fan 1260 -> 1960

luffy

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282 --> 65 (590W, 220v)
300 --> 71 (640W, 220v)
i am running it stable at 300 without problems although it is a bit loudy

i am not sure about PSU, i haven't opened it, is it really 650W? Shocked

caoxg

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and, and ,how about the different of utility?

caoxg

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Quote from: caoxg on April 04, 2013, 01:58:55 AM

Another thing is I have one avalon hashrate at 65G, another only 55G.

Both 282 mhz.

How about your hashrate at 282Mhz?

it's very strange 1 of them is only 55, while another is 65.

sgravina

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Quote from: julz on April 04, 2013, 06:02:00 AM

Quote from: sgravina on April 04, 2013, 05:56:36 AM

Quote from: caoxg on April 04, 2013, 01:07:35 AM

the default is 282, and hashrate is 60G.

Does anyone tried to set it to 300?

I tried mine at 300 for about 20 minutes. The hash rate and the shares submitted didn't change. So I put it back to 282. My unit was in a cold room, 0 C.

Did you restart the cgminer process? I'm definitely getting more hashes at the pool end.

It was only a 20 minute attempt. Yes I did restart cgminer. The thing is running so well that I am loath to mess with it. I have a better spot to put it but I don't want to turn it off.

julz

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Quote from: sgravina on April 04, 2013, 05:56:36 AM

Quote from: caoxg on April 04, 2013, 01:07:35 AM

the default is 282, and hashrate is 60G.

Does anyone tried to set it to 300?

I tried mine at 300 for about 20 minutes. The hash rate and the shares submitted didn't change. So I put it back to 282. My unit was in a cold room, 0 C.

Did you restart the cgminer process? I'm definitely getting more hashes at the pool end.

sgravina

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Quote from: caoxg on April 04, 2013, 01:07:35 AM

the default is 282, and hashrate is 60G.

Does anyone tried to set it to 300?

I tried mine at 300 for about 20 minutes. The hash rate and the shares submitted didn't change. So I put it back to 282. My unit was in a cold room, 0 C.

The thing is running so well that I am loath to mess with it. I have a better spot to put it but I don't want to turn it off.

julz

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I've been running at 300MHZ for a couple of days (in an air conditioned room). It seems to give around 71GH.

Wayne_Chang

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I believe if you can provide a efficient cooling. overclock at this level is acceptable.

allinvain

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Someone else mentioned on a different thread (can't remember which one) that if you set the clock to 300 the hashrate bounces all over the place from 60 to 80 GH/s. Can anyone else confirm this wild fluctuation in hashing rate and what would be the average hashrate for an Avalon clocked at 300?

caoxg

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Winter is coming

Another thing is I have one avalon hashrate at 65G, another only 55G.

Both 282 mhz.

A Meteorite

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Quote from: kaerf on April 04, 2013, 01:30:02 AM

yes. i've been running that way for a while now. i think xiangfu said it should not be a problem.

would be nice to know if we can go past 300 though.

What hash rate are you getting at 300MHz?

Topic: is it safe to set core frequency to 300Mhz (Extreme) for avalon? - page 4. (Read 6417 times)