Quote from: MoreBloodWine on August 23, 2014, 09:25:14 PM

Quote from: MoreBloodWine on August 23, 2014, 05:17:05 AM

Quote from: twib2 on August 23, 2014, 04:43:03 AM

Quote from: MoreBloodWine on August 23, 2014, 04:37:49 AM

Ok, so were 3 days 5 hrs in on the 243.75's and I've noticed some drops in hash. I know machines have variance of +/- 10% sometimes but it seems like a steady but slow decline. What's weird is the time passed being only 2 days and change, compared to say a month or something.

Anyone else get this with OC'd machines ?

Power supplies. They're probably close enough to the edge of the kind of power the S3's like (beefier than they draw) that just staying hot for a long time is enough to suck hashing power.

Do you have 2 PSU's on each OC'd unit, or only one? And are you using two separate 6-pin PCI power connectors for each blade (not daisy-chain style) or only one?

My suggestion is to either cool the PSUs and see if your rate goes up, or use more/better PSUs. Poor power doesn't always show up in x's or -'s now that I've been playing a bit with my good S3 and just got 60 GH/s back by adding another PSU.

Worth a try!

My friend hosting them said and sent pics that each one is on a singular supply of 650W or greater with each miner using all four power ports.

Should I find out the specific PSU not that I think it matters with each one being 650w or greater.

Edit:

--- And are you using two separate 6-pin PCI power connectors for each blade (not daisy-chain style) or only one?

I actually just shot him an email about this but do you mean four cables using four ports on both the miner and PSU ?

I also dont get the beefier thing.

So I just heard back from my host.

He said hat each miner is in deed powered by all four ports on both the PSU / miner using four individual power cables. I have since asked him to please find out the specific make / model of each of these PSU's so the rail voltage info etc. can be looked up to see if maybe, just maybe, it is the PSU's which is questionable a this point since it still could just be system variance / an OC thing.

Still no word yet from my host on specific PSU's but I don't think it will matter and here's why.

I've been keeping an eye on the miners, doing refreshes every so often. Here's what I've noticed. It seems when I drop some MH one of the blade temps rise. Similar effect when I gain some MH, a temp goes down. So it would seem my issue is temperature based.

With that said, if this proves to be right and more time well tell as I continue to watch the numbers.

So... what if any alternative cooling methods can be used on overclocked S3's (237.5 and higher) ?