What about just venting the heat straight outside? Then at least you're not trying to cool the heat that's being produced. I guess air is going to be coming into the house from somewhere with that kind of venting?

If you had all 4 rigs next to a window that had a few beefy exhaust fans I assume that would at least get rid of the heat. Unsure how that would effect the rest of the basement though.

Cool thanks for the help makes sense.

More expensive (the extreme is free shipping) and the extreme has been in stock for 10 days. I just got the notify e-mail from newegg also.

Step your game up man.

The price is more reasonable.

You should sell them separate. You've got a high end 69xx card, a high end 58xx card, and a low end card. It's a weird setup. People usually match them I'm not sure who is going to want all 3.

People like to go all 6xxx series, all 5xxx series, all high end or all low end. Who is going to buy a mobo, psu, ram, cpu to toss these 3 cards in? They are people looking for the 6970, there are people looking for the 5870, a few people would buy the 5770, but no one is looking to buy all 3 at once IMHO.

They'd sell much more quickly on their own. Good luck!

I've heard the gpu limit is 4 in Windows, but I've also heard people have had more. I know in Linux there is no actual limit, I believe there is a simple kernel setting to achieve this.

But most of the 5+ gpu setups I've seen where dual gpu cards. I've read a lot of reports that using 5 cards causes problems with a lot of motherboards. In theory 7 cards would work with Linux but I wouldn't have much confidence the motherboard is going to support it. I'm not sure what the main problem is with 5+ cards but I've seen enough posts about it that I'm fairly sure it's legit. There was a guy who had 4x6990 8 gpu linux rig and he said adding the 5th card (6990 and a non 6990) he couldn't get it to work.

You're better off with a 3-4 pcie system. The mobo is cheaper, the psu would be cheaper and from my numbers the 5-6-7 card systems don't give you more bang for your buck due to the mobo/psu costing quite a bit more.

Is it possible to use risers in the pci 1x slots in a 4u case? I've never seen a 4u case in person so I have no clue how big it is. I understand you can fit big cards and most cpu coolers, but is there enough space to mount cards on a riser somehow?

Yeah but 27 BTC (3x5830s in stock from Newegg) gets you 900 mhash. Buying used cards, that were abused, for 100 mhash, for 18 BTC? Seems like paying a premium for used no warranty mismatched cards.

Shit you could buy 4x 5830 get 1.2 ghash and still save money (38 BTC).

1.5 BTC for one?

Ignore him. He spams every thread trying to promo his site.

I'd focus on eBay for now. The main problem is you can get them from Newegg (over 99 in stock right now) for $129 with free shipping (free 2 day if you do the shoprunner trial). Then you know for a fact they're new, with warranty, and able to return them.

If you wanted to sell all 64 at once, maybe at $110 or $100. Like I said, I'd eBay it until Newegg runs out of stock. No one is going to buy them when it's roughly the same price from a major online retailer. The risers aren't enough to really change most people's mind.

It would have to heat up to 200-300-400c before it caught fire. Even if the cooling failed the computer would crash/shut off long before that. The fan would melt off long before that.

Black asphalt in the summer is probably hotter and I'm not aware of cardboard bursting into flames.

I wasn't impressed with myopenpc. If you had 1 card, like the looks of it, maybe. But it's flimsy, really unstable with 3-4 heavy cards on it and honestly if I could do it over I'd just take a peice of wood, drill 1/8" inch holes and mount the motherboard on that.

Wood is a lot easier to expand/adjust and it's cheap. The aluminum 80/20 setups seem pretty nice.

EDIT: Wanted to add if you wanted to get myopenpc as a cool desktop, it will fit the bill. The value is pretty good for the price. But a mining rig is just more then it was designed for so I wouldn't suggest it for that. The product itself was pretty cool it's just more about looks then running a quad video card mining rig.

Chip in? You realize the people who started BTC have 100,000s of BTC right? Wildcard cert is like $200.

What's the load on the cores? Wonder how close it is to using 100 watts. Sounds about right though. It's a nice boost over a normal cpu.

75c and under should not be an issue.

They are made to run fine at 85c even 95c. But that's for short term usage, not 24.7. I don't know of many common applications that would load the gpu at 99% 24.7 so you have to be a little conservative IMHO.

As for fan speed, 50-60% isn't likely to radically shorten the life of the fan. 80-100% I'd be pretty worried about.

With this stuff it looks to be about the same length runs around $164.

http://www.8020.net/T-Slot-1.asp

Everyone was between 1.55 and 1.6. That's called guessing.

The timing and the network hash rate constantly change. People generally know where it will hit. People are guessing within that range.

You told people to stop guessing, ran the numbers and were way off, then said it's between 1.55 and 1.6. No kidding, that's the guessing part. Like I said, 13% (ended up being 13.3ish).

It's actually going to be around 13%.

80/20 Aluminum isn't cheap. Looking at his case he's probably got at least 8'. It wouldn't cost $200 but I'd say it's over $100.

There's 10,000s of people folding for free, correction they are PAYING to run their folding rig. Bitcoin is "less profitable"? People will mine for free, people will mine when they lose money. That's already been proven.

The fact it now takes 60-70-80 days to get ALL of your money back for your hardware? It's a non-issue. The next difficulty increase will likely be under 10%. People were figuring on 50% increases a month ago. It's not longer a great way to make quick money, seems like we still have 50k miners out there. If difficulty was 3M and BTC was at $5, you'd still have boat loads of miners.

People are no longer buying up tons of hardware to make a quick buck? That's good news. Miners just dump BTCs on the market as fast as they make them to recover costs. Not having huge influxes of short term hardware which needs to be paid off flooding the exchanges will be great. Difficulty increases will slow, supply will slow, demand will catch up.

BTC doesn't need 50k miners making money hand over fist. Thankfully that's coming to an end.