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3221  Other / CPU/GPU Bitcoin mining hardware / Re: Maximum 7990s per mobo? on: June 25, 2013, 09:16:54 PM
The AMD Drivers limit you to 8 cores, with means 4x 7990 tops.

In that 18 slot rig RJK was going to build, he was planning on using visualization to split up the 18 cards into virtual OSs, so the drivers would only handle ~6 at a time. That FASTRA2 computer uses Nvidia, which have different drivers.

You can look all you want, but you won't find anyone with more than 8 AMD GPU chips in one computer.

virtualization not visualization

I said 'normally'. That means under 'normal' circumstances where official, unmodified drivers, OS kernels and BIOS are used.

3222  Other / CPU/GPU Bitcoin mining hardware / Re: Maximum 7990s per mobo? on: June 25, 2013, 04:57:11 PM
1. In theory you may be able to connect... maybe as much as 20 GPUs if you find a suitable motherboard with that many PCI-E slots?

Take a time to read:

18 GPUs: https://bitcointalk.org/index.php?topic=64450.0
13 GPUs (nVidia though): http://fastra2.ua.ac.be/?page_id=214

In short: the more GPUs, the more problems you will run into.

Normally, 8 GPU (or up to 4 dual-GPU graphics cards) is the max. you can get on one motherboard.

Problems that you will encounter are:

- hardware (motherboard) limitations, some have more PCI-E slots than they can simultaneously handle, in order to use them all sometimes you may need to disable some unused features / disconnect some devices on the motherboard.
- software - BIOS
- software - OS
- software - GPU drivers
- obviously you will need to use >1 PSU for each 14 GPU rig so make sure you know how to connect those without frying anything
- profitability - the difficulty will probably increase so much that the investment will not pay for itself (unless we see a rapid increase in BTC price)

2. as for the temperatures:
- use GPU-Z to get the temperatures because it can read from more sensors than most other software
- sometimes the GPU is cool but the VRAM (shouldn't be the case if you underclock it for SHA) or the VRM is runnnig very hot (especially the VRM if you like to overclock and/or increase the voltage)

3. If you hashrate is 500 MH/s check if you are mining on both cores because it should be double of that.

3223  Other / CPU/GPU Bitcoin mining hardware / Re: Got a 5870 from someone off craigslist on: June 25, 2013, 04:21:58 PM
Can you record the sound it makes and upload it to YouTube? I think it could be a coil. Most of the time the GPU should run fine with that but I would still either try to return the card or find someone who can fix this, it should be cheap.
3224  Other / CPU/GPU Bitcoin mining hardware / Re: 7970 broken :( on: June 25, 2013, 04:17:21 PM
If you have warranty RMA it, if you don't look around if someone in your area fixes GPUs.

Next time, check the temperatures in GPU-Z, it shows data from more sensors than most software (I think only Aida64 can compete with GPU-Z in terms of GPU sensor reading).

The GPU core could be running at low temperatures but you don't know (or you do but you didn't yet tell us) whether the VRAM or VRMs weren't getting too hot.
3225  Bitcoin / Bitcoin Technical Support / Re: 3 blocks in 14 minutes by same guy??? on: June 25, 2013, 12:32:56 PM
It is also possible that 61.164.151.77 is a very well connected full node and relays other miner's blocks first so don't treat blockchain.info data as an ultimate oracle of Truth.
The web page there says F2Pool.

That doesn't preclude the possibility that they are also a well-connected node that would make them appear as if they mined blocks that were mined by a different miner.
3226  Economy / Scam Accusations / Re: Beware of scammers! on: June 25, 2013, 11:28:32 AM
lawl, whoever does a deal with someone named berniemadoff should hope for the worst

No, people don't learn. Nefario and Pirate were both trusted members before they showed their scammy nature.
3227  Bitcoin / Bitcoin Technical Support / Re: 3 blocks in 14 minutes by same guy??? on: June 25, 2013, 11:21:24 AM
It is also possible that 61.164.151.77 is a very well connected full node and relays other miner's blocks first so don't treat blockchain.info data as an ultimate oracle of Truth.
3228  Economy / Service Discussion / Re: I'm working on a BitCoin Card....What do you think? on: June 25, 2013, 10:51:54 AM
I thought BitCoin only generated in 50 coin increments, but I got 50.44 here.

 Grin

You are asking for money to issue a bitcoin-backed debit card without even knowing about the FinCEN regulations that will cost you hundreds of thousands of dollars to comply with

That's only if he is interested in the US financial market.
3229  Economy / Digital goods / Re: Selling verified paypal with $1,200 balance on: June 24, 2013, 08:43:21 PM
I'd guess that the only reason someone would sell a paypal account is if it as stolen.

That, or he doesn't want to expose his real identity.
3230  Bitcoin / Mining / Re: Difficulty, Hashing Power, and redistribution of wealth? on: June 24, 2013, 08:33:22 PM
The network is now safer because the entry cost is higher for someone who would want to perform a 51% attack (let's say Obama lol).

 I would estimate a fraction of a percentage point of USA black-ops funding would be enough to design and pay for enough custom ASIC processing to own Bitcoin if they wanted to.

Like they have any experience and can find people with enough knowledge of how mining works etc. without arousing suspicion (hope I'm right)

I would guess the cost of a single military attack helicopter would be enough to accomplish this task.

Why 'single'?
3231  Other / Politics & Society / Re: Speeding License on: June 24, 2013, 08:29:00 PM
One must first ask whether it is necessary for having a government regulate that. People still need insurance and without government the insurance companies would want to have some way of assessing an individual's driving skills. Now someone without a license pays more for insurance than someone without one (at least in my country). Getting a driving license doesn't require much skill in most countries, if insurance companies would deal with assessing the drivers' skills without current government regulation (maybe in cooperation with some of the better companies that now give driving lessons) they could do so in a more rigorous manner than the government does with their 'driving' licensure and better adjust the insurance rates depending on a driver's actual skills.
3232  Bitcoin / Mining / Re: Difficulty, Hashing Power, and redistribution of wealth? on: June 24, 2013, 07:59:36 PM
It just seems that with asics coming on line and hash rates increasing, that its overall a redistribution of bitcoin mining.  So the network is really no better off than we were mining with 5770s last year... and the last block to be mined will still be around the same time it was predicted to be mathematically.  We've just tipped the same tables in favor of the few who have large amounts of asic hash power.

The network is now safer because the entry cost is higher for someone who would want to perform a 51% attack (let's say Obama lol). It is / it is going to be impossible to do that with GPUs and a limited availability of ASICs further helps to diminish the chances of someone being able to purchase enough hardware for a 51% attack.

Or, is there a ceiling limitation to difficulty?  And once we hit that, we can mine the block chain faster than originally though possible?

No.
3233  Other / Meta / Re: Auto translations based on default language selection? on: June 24, 2013, 09:33:29 AM
I can translate English > Spanish and Spanish > English.
If someone pays me I can translate all the forum  Roll Eyes

+1
Let me know if you need help with Polish or French.
(I may also improvise a bit with Spanish)
3234  Bitcoin / Project Development / Re: BAMT version 0.5 - Easy USB based mining Linux with farm wide management tools on: June 23, 2013, 02:00:52 PM
I clicked on the link and I see a message that Bamter.org is for sale.

Project is not supported anymore?


With GPU mining no longer or barely profitable even with cheap electricity (at least with BTC, it may be different with some altcoins), I doubt lordcrappo will want to resume support.
3235  Other / Beginners & Help / Re: Trading BTC for Posts on forum on: June 23, 2013, 11:40:41 AM
I hope whoever signed up for this forum at least used a different username / password combination. Interesting that nobody received a confirmation email.

$50 for three posts is too good to be true and the OP signed up today.
Probably a scam. Don't try or you might get your accounts on other sites hacked.

Assuming someone's imprudent enough to re-use a password and use an email other than a throwaway one.
3236  Other / Meta / Re: How many members are on this forum? on: June 23, 2013, 11:38:18 AM
Only 50345 acounts out of 129185 (<40%) have 1 or more posts.
3237  Other / Meta / Re: franky1 / tortious interference on: June 23, 2013, 09:45:14 AM
this post is a post to subscribe to a thread where a crazy person attacks franky for asking valid questions.

The laffocoin potential is immense.


https://bitcointalk.org/index.php?topic=90136.0
3238  Other / Meta / Re: iram on: June 22, 2013, 11:24:26 PM
Damn, with all these ripple giveaways, I really need an alt (or 100).

They no longer give out 50 000 XRP , it's only 1k XRP now (I'm happy to be one of the first to have signed up).
3239  Other / Beginners & Help / Re: Trading BTC for Posts on forum on: June 22, 2013, 10:48:07 AM
username same as here: malevolent

please send the BTC to this address: 13HfCDAGUiNqjbJzLoeSQp8S7a3yhkqm5v

Thanks

If anyone hasn't registered yet, please use my referral link Wink
3240  Other / Meta / Re: ... Company specific Child board in /Custom hardware/ ? on: June 22, 2013, 08:57:27 AM
Sections need to be vendor-neutral.
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