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41  Other / Beginners & Help / Re: Mining machine VS space heater on: August 11, 2011, 02:12:16 PM
Maybe you could get a bathtub next to your rig and try to heat the water with exhaust air from your GPUs. It wouldn't get any hotter than you GPUs are so no chance for boiling water for cooking or something like that. Maybe you could fry an egg on your graphics card if you were to replace the heat sink with a flat copper plating Tongue
42  Other / Beginners & Help / Doing the math, starting to mine still paying off? on: August 11, 2011, 01:58:29 PM
I was planning on setting up my own bitcoin rig just for the fun of building something.
But I am a student and on a small budget Cry so this project has to at least to amortize itself. Just did some calculations to see how deep down in my wallet i have to reach to get this thing on its way.

I already own: a MoBo with a Celeron and 2 Gigs of RAM. It has one PCI-e x16 and three x1 slots. Two PCI slots as well but I don't want to utilize them for now. Also I own a HD5870 and a 350W and another 450W PSU. The costs for these hang around 380€.
But to get this thing on its way I want to add 3 more HD5870s. Why? Because they have a good Hash/Watt rating and electricity is expensive where I live. I mean really expensive. And I don't own solar power panels or wind turbines or anything  Wink . I would also go for HD5970s but they are rare right now. And HD6990s are too expensive.
Three more HD5870s cost around 170€ (used ones, yay!) so I add 510€ to the list.

Now I can't pop them in my case, too, because it would get too hot I'm sure. The warm air from only one card is already stressing the PSU that is mounted above the mainboard and sucking in the hot air from inside the case. So I need PCI-e extenders. Four x1->x16, three of them with molex power-cords so that I can use the 450W PSU on them cost ~70€ in total (shipping included). And then I also need the PSU starter adapter thingy so that both PSUs start simultaneously. +8€

That is a grand total of 968€! Bazinga!

Now I would estimate the power consumption of this baby to be 4*200W for the GPUs and another 100W for CPU, MoBo, and fans that I eventually put in there. (Now one of the PSUs is probably gonna blow, maybe add another 80€ to replace the 350W thing with something (cheap, but) decent, like 550W or 600W)
...anyway 900W at 80% efficiency is gonna suck ... 1125W out of the wall. That means I will be paying 189€ more with my next monthly utilities bill. (0.25€/kWh, per four weeks or 28 days).

Oh and now the sweat part, suggested income!
I would say a good estimation of the Hashrate would be 1600 MHash/s, that's 400 MHash/s per card. So according to this calculator http://www.alloscomp.com/bitcoin/calculator.php at the current difficulty of 1888786.70535 I would be averaging 23.84 BTC per 28 days.
And at the current currency rate of ~ 7.10€/1BTC (that's 10$/1BTC) I would then earn 169€.

But OH WAIT! I need to pay the electricity bills, so what I really earn is 169€ - 189€ (-some fees for the pool) (-some less income if difficulty increases) = -20€ OR EVEN MORE!
43  Other / Beginners & Help / Re: More MH/s from Your GPU? on: August 11, 2011, 01:17:36 PM
Quote
So if the card can support larger workgroups, more elements can be operated on with the same data, hence faster in cases where this can be leveraged.

Yet, and I am aware you did not explicitly say so, just want to point it out though, larger workgroups do not necessarily mean more Hash/s! Checked this on my card.
44  Other / Beginners & Help / Re: Google going Bitcoin? on: August 11, 2011, 12:11:05 PM
and bitcoins will replace the dollar, too.
45  Other / Beginners & Help / Re: 3% Efficiency with CGMINER on: August 11, 2011, 11:14:20 AM
Quote
Utility (accepted shares / min): 0.14/min

That's approximately 7 Minutes for ONE accepted share. If you watch the bitcoin monitor for a while ... Cheesy ... then you may notice that's almost the rate blocks get generated.
Also, a block per 10 minutes is the target generation rate regulated by the difficulty setting.

Anyway, I'm not good with statistics, but the current difficulty, 1888786.7053531, is the number of shares you need to calculate on average to find a block. So CPU mining is really pointless at this difficulty level. Maybe if everyone was to turn off their GPUs...
46  Other / Beginners & Help / Re: More MH/s from Your GPU? on: August 11, 2011, 10:29:11 AM
Quote
Also I am curious, how to explain technically difference between extra flag parameter of -w 128 and -w 256, and impact to performance for 58xx and 5970 cards?

I am, too! I guess it has to do with the way that things are scheduled on the stream processors?

Anyway, can u say something about the powersaving-effects of underclocking the memory?
47  Other / Beginners & Help / Re: PCI-e x1 vs PCI on: August 05, 2011, 08:53:25 AM
Awesome! Cheers!
48  Other / Beginners & Help / Re: The PSU Mystery on: August 05, 2011, 08:12:10 AM
I followed the wikilink you supplied and landed at the homepage of the 80 plus certification where I found a datasheet of the 350 W PSU that popped.

http://www.plugloadsolutions.com/psu_reports/XILENCE_XP350.(12)G_ECOS%201752.1_350W_Report.pdf

When I look at the input-output diagramme it clearly states that it needs about 400 W to supply 320 W.

Also in the wiki it says
Quote
In some instances a reseller has claimed a higher wattage than the supply can deliver - in which case the reseller's supply would not meet 80 PLUS requirements.[4] The 80 PLUS web site has a list of all certified supplies, so it is possible to confirm that a supply really meets the requirements
Which sounds to me like every 80 PLUS cvertified PSU should be able to deliver the wattage that is written on its packaging, right? So my 350 W PSU should supply 350 W without blowing.
49  Other / Beginners & Help / PCI-e x1 vs PCI on: August 05, 2011, 07:56:33 AM
Hi!

Does anyone know whether it'd be possible to run a PCI-e x1 (or a x16 card that is only running at x1 bandwidth for that matter) in a old PCI slot?
50  Other / Beginners & Help / Re: The PSU Mystery on: August 04, 2011, 12:14:38 PM
Okay then.
I will just stick with my Thermaltake 450 W PSU for now and as soon as I need more power I will make sure to get a single rail thingy, now that I know to look out for that in particular.

Thank you all!
51  Other / Beginners & Help / Re: The PSU Mystery on: August 04, 2011, 12:01:59 PM
but continue to experience with cheap PSU ...
There's a reason this is the newbie Forum. No need to get cocky.

So what one could use best is a single rail supplying enough VA's for the GPU and another smaller rail for the rest of the components?
52  Other / Beginners & Help / Re: The PSU Mystery on: August 04, 2011, 11:13:36 AM
Hmm, can you explain why a single rail 12V is better than multiple?
53  Other / Beginners & Help / Re: The PSU Mystery on: August 04, 2011, 10:25:20 AM
Yeah so I guess I'll be sticking with the Thermaltake PSU because my wallet.dat is very small right now Cheesy

How can I tell a good from a bad PSU? To me they're all the same
54  Other / Beginners & Help / The PSU Mystery on: August 04, 2011, 09:19:47 AM
Hey there!

Something weird happened to me when setting up my very first miner. I had a leftover mainboard and CPU, also a HDD and a case, so I figured if I popped in a new Grafix-Card and a PSU I could mine away...

I calculated the power consumption of the whole system and came out with ~340 Watts. So I bought a 350 Watt PSU (Xilence Rev. 3).

But when I had everything in place, OS installed (WinXP 32 Bit) and phoenixminer set up, the power consumption went to >380 Watts. (I had a Watt-Meter at the power plug of the PSU.)
I thought it would be okay that the PSU went higher than 350 because of course it only has an efficiency factor of ~85%, so to supply 350 Watts it might need 350 / 0.85 = 411 Watts. But after two hours getting hotter and hotter, it blew. Whoooops!

I then bought a 450 Watt Thermaltake PSU and it's running at <320 Watts now.

Also, I had the Xilence PSU replaced so would it be wise to put it back in and think of the first PSU as construction error or something?
Can someone explain what happened?

Thanks in advance!
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