Hello This thread is GOLD should be sticky! Until now i was using trixx to operate the 7950s at 1.100V but now that I've switched to linux, i am toasted!, no voltage control! I was thinking, why not, modify the original bios card with a fixed voltage? I made a small investigation in the matter, I would like to hear your opinions before try it in one of my cards. here it is: Lower voltage of Sapphire 7950 to reduce power (linux-usb)firmware modlol Should it? At stock voltage I run 2x7970s and 1x7950 at 800W (1900MH/sec) on Kill-a-watt. OP draws 200Watt more on 7950s with modded bios? Doesn't seem like good advice for the kiddies. |
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and its gone. Either sold off-ebay or scam gone bad.
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Their Facebook page claims they've already reached 40% of their pre-order quota, and delivery is on the 15th July (little under two months). So more BS, or there are some very foolish people that read Tech Crunch! They have no prototype, just rendered drawings. https://www.facebook.com/CryoniksTechcrunch is pretty sad, maybe they got paid off. Heh facebook page, 17 likes but they've got 40% of a pre-order batch for $15,000 units, right. Some more technical gold from these fellows: "You're very welcome! We find that the average North-American home is already pre-equipped to handle the power requirements of our units. For reference, we find that the average clothes-iron consumes roughly 1200-1400W when heating. A standard U.S 3-pronged outlet is sufficient to handle the working loads typical of our units. Hope that helps!" Ok, so most North American homes have multiple outlets running off a single 15-20A 120V breaker. 20A*120V = 2400W, so an entire dedicated 20A circuit isn't enough for a single one of these miners, but they've somehow managed to find the "average" home is equipped to handle it somehow? I suppose if maybe you ripped out your oven, and wired up a hookup for this miner, but that might be something to inform potential customers about. Great scientific research, references a clothes-iron as backup. |
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i7 2600k - 95W
ATI 6850 - 125W
ATI 5850 - 150W
Your current power usage are already conservatively at 370W.
Putting a 200W GPU in there, would be putting yourself that bit closer to the max of that power supply.
Unless it's a very high quality one, it most likely will not cope with the power requirements.
You need more wriggle room, as power supply's are only about 85-95% efficient and over using one voltage line, will go over what it is rated for.
In your position, if your consider putting very powerful multiple GPU's, I'd only do so with more info about your power supply.
Wrong. I don't know why PSUs are the most consistently misunderstood pieces of hardware, but I see this so often, it hurts. Quality PSUs are rated at XXXW Continuous, meaning they can deliver XXXW 24/7. Non-quality PSUs are junk and shouldn't be used at all. A PSUs efficiency has nothing to do with what it is rated to deliver, it has to do with conversion efficiency (your PC uses DC, and your house delivers AC, there is an AC/DC conversion, and there is where efficiency comes into play). 2 7950s on a 600W PSU should be fine, a 5850 and 7950 even more fine (even though sometimes they do not play nicely together), but do maintain care that you are not aggressively overclocking, as your system (CPU, mobo, HD, fans, little LED lights, beverage warmers, etc) all take up power as well, and you do want to leave the "wriggle room" above to make suer you don't blow nothin. |
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It's still the same wattage being drawn by the cards, that much is true. But, at the same wattage and lower voltage, the amps go down, which means less heat (heat = wasted energy). This lowers are draw from th wall, and can lower your bill. Only by 1-2%, but still...
^This. He's correct.  |
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we are decrypting hashs for the NSA.. its cheaper for us to do it..
It'd actually be incredibly expensive if that were the case. To the tune of $450,000 per day ($164,250,000/yr). Just about any other way would be cheaper. |
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This isn't a trojan wallet stealer? Crazy.
Query, how much difference in power is there running ram at full clocks and at say, 300Mhz?
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Don't just mindlessly spam bump your own thread. You don't need 4 replies in 15 minutes. You've been around enough that you should know better.
You can simply start the miner with specific arguments for each card, you designate which devices to enable using -d as you pasted.
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I know of one project, However it monitors based on report from dust coin, which I've found to have significant reporting lag from actual difficulty... Not sure who knows enough to mod it to keep on top of difficulty.
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GPU's will be good for a while still. New GPUs can still be paid for in 4-8 months.
After that, it will depend on your utility prices and the BTC exchange rate.
Contrary to what was said earlier, there is (currently) a very good correlation between difficulty and BTC exchange rate. That means that, even though GPU's will mine a lot less BTC, the BTC will be worth more in fiat terms and this will probably offset the dip in BTC mined (so you can still pay your bills and keep your GPUs running).
This is of course an educated guess, as everything is in flux...
New gpus can be paid for in 6 months at CURRENT difficulty, which will not last. Contrary to your contrary there is no correlation between price and difficulty, there is a correlation between difficulty and price ( in this case order matters ). This means that if difficulty goes up price doesn't change. GPU will be run out by ASIC. The only question is how long til then. |
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The OP revived the topic to state that you can't sign up anymore...?
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I worry about an electrician that can't simply look at a PSU Label, as all modern PSUs that I know of state that they are designed for 120 and 240 input. That aside, photon said it all.
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I think yochdog has ~43+GH/sec. Don't think he reads here either, so go poke him.
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I think I've weighed in on this before, but I will do so again. Dual PSUs are almost always bad juju, from what I've read of peoples experiences.
If you're worried about blowing your PSU, try the following, 4x7950 off a single PSU. 250Wx4 cards + 200W overhead for your Mobo + fans + CPU + whatever should be plenty. It's a silverstone which is typically a good quality PSU, so it should be able to run at peak for extended periods of time, just don't go crazy and OC like a madman for this phase.
I don't want to read back to what exact model you have, but I believe you said 80Plus Gold. So assuming you're hitting exactly 1200, which feels unlikely but possible, you'll be running 87% efficient, so you should see ~1380W on your kllawatts from the wall.
If so, it is as I suspected, your dual PSU set up is being a boner and causing you headaches. If you see more than 1380W from the wall, I'm a bad man potentially causing you to murder your system, shutdown ASAP (assuming nothing faulty you shouldn't be in this scenario). If you see less than 1380W from the wall, as I mentioned earlier you probably have even more headroom than you thought.
Somehow my Athlon 145 +misc uses ~180W, which is why I don't expect you'd use much more than that.
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1125Engine 975Mem I get about 630MHash on one ASUS, same settings diff card I get 650MHash/sec. I'm a lazy guy though and don't really want to figure out how to push it harder.
Two ASUS two different results, go figure. You also take a minor penalty to hash rate if you're using it as a display card, which might be part of it.
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After buying the wrong part numbers on Mouser and blowing $30 I didn't have to, I was wondering if anyone has done this before. I have a need to crimp my own PCIe power cables, but I need to find the "blank" plugs (and pins to go with them, but that looks easy). The hard part is finding these 8 position molex connectors keyed the proper way for PCIe. Anyone happen to know where to grab a bag of 20 or so of these? I really miss local shops - I could just roll in, compare the connector with what I need, and roll out  I actually have a weird thing about that too. The internet brought us a plethora of cheap and easy computer parts, but it meant the demise of being able to browse things when we weren't already 100% sure about something, and it's actually rather frustrating. As for your problem, I'm guessing that ssateneth addressed it, however I'm not sure what exactly it is you're looking for. Did you already wire-strip a bunch of molex wires out of a PSU? 2x4-pin to 1 8-pin adapters exist, and are probably easier than crimping, if you can get away with it. |
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Props to this guy for not just raking in peoples money on the promise of turnaround that seemed unlikely. I'm guessing sample batches have yet to be delivered.
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