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101  Economy / Goods / Sapphire 6990 (SOLD) on: September 01, 2011, 09:18:29 PM
I have 2 of them available.  Used for about 2 months.  In perfect shape/condition.

Anyone interested?
102  Other / CPU/GPU Bitcoin mining hardware / HD5970 new in stock newegg 499$ on: August 26, 2011, 09:29:29 PM
original post:

link to 5970:
103  Bitcoin / Mining / I finally understand... on: August 26, 2011, 01:08:53 AM
Why the Hero members don't seem to respond to too many posts.

When I joined, I was eager to respond often... it was exciting...

recently, I've realized that few make it to that level and once you make it there, you simply lose all interest in the majority of stupidity that is posted here...

and you do not engage in nonsense because it's pointless, waste of time and useless.  stupidity has a way to shake itself out in the long run.

you shake your head and brush it off.  at some point you don't even bother shaking your head. you ignore almost all posts unless they involve Hero members...
104  Bitcoin / Development & Technical Discussion / looking for technical info on: August 25, 2011, 11:09:54 PM
could someone point me to where I can see code /pseudo/code for the calculation of a hash.  step by step would be awesome, but anything would be helpful too.
105  Other / CPU/GPU Bitcoin mining hardware / 6990s in stock: (ALL GONE NOW) on: August 24, 2011, 05:34:19 PM

limit 2.

and, they're gone... all gone...
106  Economy / Goods / 5830 being raffled of by me on: August 19, 2011, 05:11:47 PM
107  Other / CPU/GPU Bitcoin mining hardware / 5830 being raffled of by me (UPDATED) on: August 19, 2011, 01:38:04 AM
108  Economy / Gambling / Xtreme HD5830 Sapphire raffle (CLOSED) 4 entries. winner to be announced. on: August 19, 2011, 01:16:56 AM
The raffle will occur on time, regardless of how many tickets will be sold.  so far there are 4 entries. (updated 8/25/2011 10:41 PM CST)

Rules + Prize:
entry ticket is 1 BTC

Up to 20 raffle tickets will be sold.  Drawing occurs when the 20th ticket has sold or 1 week from original (this) post, whichever comes first.

I will post the number of tickets available after processing each ticket purchase to keep everyone up to date.

To purchase a ticket, please PM me and I will give you an address to send your 1 BTC to.  When you send the BTC, tell me what your sending address is so I can associate your nickname with the sending address.

I will use your nickname and enter them into third-party draw service provided bu will pick a winner and the results are public.

I will PM the winner for shipping address.  I will not ship outside of US, so if you are not in US, please don't buy a ticket.

The card is a 5830 with the bracket clipped of at the bottom.  you get everything it came with.  if you care about the bracket being clipped off, please don't buy a ticket.
this card was used for a few days until I upgraded to 5850s.
Here are the pics:

109  Other / CPU/GPU Bitcoin mining hardware / is this worth considering? on: August 14, 2011, 04:22:20 AM
I know we're not supposed to skimp on PSUs.

What about using 2 of these: ?
for about 800 Watts requirement...

will this die in about a month?
110  Bitcoin / Mining support / GPU-Z interfering with power? on: August 12, 2011, 10:02:18 PM
so, i've noticed something really weird...  maybe it's known already and has been discussed, but I haven't seen a topic on this.


if I leave GPU-Z running on sensors, after a while, one of the cards begins to throttle GPU utilization.
I noticed this on a system with 3 5850s first.

Then, I was messing around on a system with 2 6990s and added a dual GPU 6870.

well, the powercolor 6870 x2 has awesome sensors, one of which is the Amp draw.  and what do you know, while GPU-Z is running, after a while, the power draw fluctuates like crazy.

solution?  exit GPU-Z and whoila, everything runs at 99-100% GPU utilization.  weird, weir, weird....

any explanation?
111  Other / CPU/GPU Bitcoin mining hardware / estimating/calculating hash rates for FPGA chips on: August 03, 2011, 01:28:27 AM
I seem to remember seeing "back of the napkin" calculations regarding arriving at what a hashing rate would be of a particular fpga/chip.  but I can't find that post anymore...

Can someone point me in the right direction/location for this please?
112  Bitcoin / Mining / Bitcoin conference on: July 28, 2011, 11:39:45 PM
So... do you all think it's time yet to think about first Bitcoin Miners conference?

113  Economy / Goods / have 5830s on: July 28, 2011, 12:35:50 AM
XFX (lifetime warranty) used for about 1 month, upgraded to faster cards.

I have 4 available right now, will have 2 more early next week.

Will take bitcoin or cash.

Make me an good offer.

I will only ship to US.  If you're in Chicago, you can pick them up from me.
114  Other / CPU/GPU Bitcoin mining hardware / What's the latest on 7xxx series from radeon? on: July 27, 2011, 04:20:04 AM
Any news on the 7xxx series lately?  Are they still on track for 4th qtr?
115  Other / CPU/GPU Bitcoin mining hardware / different hashing rates with 1 card vs. 2 (5830) on: July 26, 2011, 05:22:01 PM
Can someone explain why 1 card (sapphire 5830 extreme) is capable of 333 MHashes at 1040/350 60% fan 62 degrees but if I plop a second card in, at best I can get 1000/350 on one and about 930/350 on the second.
750W cooler master RS-750-ACAA
I don't believe it's a power issue (tried 2 different supplies although same Wattage) my second thought is mobo is contributing to this difference... ?

has anyone experimented with something like this or has seen same behavior by any chance?
116  Other / CPU/GPU Bitcoin mining hardware / Couldn't resist not to share with all you fellow system builders. on: July 21, 2011, 03:06:57 PM
A bit unrelated, but damn interesting!
Couldn't resist not to share with you all fellow miners:
117  Other / CPU/GPU Bitcoin mining hardware / Can you share your experience with a failing PSU? on: July 20, 2011, 04:44:09 PM
Could you share your experience with a failing PSU?  Note, I mean failing, not already failed (that's obvious).

What were the symptoms leading up to a failure?  any unexplained behaviors observed?

118  Other / CPU/GPU Bitcoin mining hardware / only 6 5830 remain on newegg... on: July 20, 2011, 05:15:39 AM
only 6 5830 remain on newegg...
now they're all gone.
119  Other / CPU/GPU Bitcoin mining hardware / Peltier cooling on: July 06, 2011, 04:07:19 AM
So, I've been thinking...

In order to push the cards and achieve stability with higher OC rates, VRM temps is what one needs to worry about more than GPU temps. (if you don't care about fan noise).  I'm assuming that you took care of the airflow already and that you have been able to apply necessary voltages (higher) to achieve high OC stability.

My question is, has anyone looked into Peltier cooling?

Seems it may be possible to fashion something (at least on certain cards) on the back of the card (if that's where the VRMs are emitting at least some of the heat).  Adding a heatsink over the thermoelectric cooler surface would also be possible but not necessary in order to remove heat from the board/VRMs, transfer to Peltier's surface and let appropriate airflow take it out the rest of the way.

If you understand what I'm talking about, please comment.  Is this feasible? viable? worth pursuing?  I'm planning on experimenting with this.

Has anyone experimented with this yet?

Thoughtful and useful comments are welcomed!
120  Other / CPU/GPU Bitcoin mining hardware / failed to initialize display driver wrapper on: July 01, 2011, 07:15:41 PM
I added a 6850 card to 2 6990s and now when i try to run msi afterburner i get "failed to initialize display driver wrapper"

Any ideas?  I tried searching forums for the error, could not find anything.

I already tried reinstalling 2.4 and 11.6 without success...

all cards are detected and are mining using whatever the defaults are.
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