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21  Other / CPU/GPU Bitcoin mining hardware / Holy balls, I just won this on: June 05, 2012, 06:59:28 PM
http://www.ebay.com/itm/170854545581?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

It's a sapphire board with 71.5% ASIC quality
22  Other / CPU/GPU Bitcoin mining hardware / Non-Powercolor 7970 X2 on: June 01, 2012, 11:47:26 AM
http://www.donanimhaber.com/ekran-karti/haberleri/AMDnin-is-ortaklari-Radeon-HD-7970-X2-modeli-uzerinde-calisiyor.htm

I wish I could read it :p
23  Economy / Computer hardware / [WTS] 2x 5850, 1x 5970, 6870 + rig hardware on: May 30, 2012, 04:46:32 PM
For sale I have

SOLD: 5850 - Reference
Ran at 825Mhz 1.00V for 2 months stable.  Temps settled at 60C with 35% Fan
- Shipped - Payment confirmed

5850 - Sapphire cooler
Ran at 825Mhz 1.00V for 2 months stable.  Temps settled at 68C with 50% Fan

6870 - Sapphire cooler
Never used to mine.  It was my gaming card before I got the 7970.

5970 - Reference (Powercolor branded)
Ran at 775Mhz @ 1.02v with 38% fan @ 66/68C  Vrm temps were getting high, so I applied new paste and thermal pads.  I must've used the wrong size pads.  More pads are on the way.  Gpu temps were awesome though!

I have a sempron 145 unlocked to dual core.
I have a Msi 870 G46 mobo. http://www.newegg.com/Product/Product.aspx?Item=N82E16813130591
and 1gb of shitty ram

I had 3 cards/4 GPU's on this mobo and it worked flawlessley.

Also I have a 750W TX corsair PSU, but I like to have an extra lying around for my gaming pc, so offer high and I may let it go Tongue
24  Other / CPU/GPU Bitcoin mining hardware / I like what I see! on: May 22, 2012, 01:49:35 PM
http://www.newegg.com/Product/Product.aspx?Item=N82E16811353002

Only 7 expansion slots though :/
25  Other / CPU/GPU Bitcoin mining hardware / 5970 new thermal pads on: May 09, 2012, 01:45:26 AM
Well, because my mining farm is down for the summer, I figured it would be a good time to replace thermal pads and slap a new layer of Elmers glue on the GPU's

I tested the card with guiminer and my VRM temp skyrocketed.  They used to settle at 95C, but I turned the test off after 105C. (too risky)

I used .5mm pads for the ram and cfx bridge.

I used 1mm pads for the vrms.  This is with the stock cooler going back on.  (the pads were in terrible condition anyway and the paste was dried)


So the only thing striking my mind is the pads I used.  I researched around here and saw the .5mm and 1mm for those respective parts, so I went through with it.

I used the two pads koolance sent to me for my 7970 waterblock.  the .5mm is grey and sticky on both sides.  The 1mm (on the vrams) is sticky on one side.

any thoughts on this?
26  Other / CPU/GPU Bitcoin mining hardware / Crazy efficiency for 7970 on: April 25, 2012, 09:44:00 PM
Just got done water cooling my card today, and it's staying at ~ 31C.



580mhash/s / 99.484W = 5.83Mhash/W Cheesy

factoring in 15% loss in power ->

580/(99.484*1.15) = 5.069 Mhash/W o.o
27  Other / CPU/GPU Bitcoin mining hardware / Something is wrong with my Nvidia on: April 13, 2012, 02:34:05 AM


Although I've heard this is typical..
28  Other / CPU/GPU Bitcoin mining hardware / Z77 mobo for mining. Possible? on: April 12, 2012, 12:41:06 AM
Of course it's possible o.o

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128545

This one has room for 6 cards.  Could be useful for 6x 5970 or 6x 6990 in x64 linux

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130645

Room for 7 Cheesy

Of course this fits in it -> http://www.newegg.com/Product/Product.aspx?Item=N82E16819116410
29  Alternate cryptocurrencies / Mining (Altcoins) / 7970 undervolting on: April 05, 2012, 04:34:10 AM




Still venturing lower Cheesy

Clock: 1000mhz
Memory: 710mhz
Voltage: 0.968

Mhash/s: 580

Power based on GPU-Z

(12.09v * 10.5A) = 127W

Take into account 85% efficienct: 127*1.15 = 146W

580/146W = 3.97 Mhash/W

Smiley

Update:

Dropped voltage down to .955v 100% stable.



(12.09v * 10.2A) = 123.3W

85% efficiency: 123.3*1.15 = 141.8W

580/141.8 = 4.09Mhash/W
30  Other / CPU/GPU Bitcoin mining hardware / 7870 and 7850 are here! Anyone bought yet? on: March 19, 2012, 04:19:18 AM
If you have, what hashes are you getting? Cheesy
31  Bitcoin / Mining / My theory of shares by volume vs. speed on: February 27, 2012, 08:20:04 AM
Please don't judge on my math: (irony: I'm a math minor and never taken statistics)

Well here goes:

Given: 1 share = 1/(2^32) hashes

Group A:
10 GPU's producing 100 Mh/s each
Total: 1 Gh/s

Group B:
1 GPU Producing 1 Gh/s*
Total: 1 Gh/s

*Disclamer: THIS IS THEORY ONLY

Prove: Mining in a proportional pool, you will benefit more from one gpu providing maximum hashing speed, vs multiple cards hashing at slower speeds.

A:
10 Gpu's mining @ 100 Mh/s simultaneously will provide roughly 1 share every 42.9 seconds.
((2^32) hashes / 1 share) * (1 s / 100E6 hashes) = 42.94 s/share

B: 1 Gpu mining @ 1 Gh/s will provide roughly 1 share every 4.29 seconds
((2^32) hashes / 1 share) * (1 s / 1E9 hashes) = 4.29 s/share


ALL POOLS USE A NON-FEE PROPORTIONAL METHOD
Pool has a constant 1 Th/s collective speed.
Scenario 1: (extreme case)
Pool finds a block in 30 seconds.
Total shares: (1 share / (2^32) hashes) * (1E12 hashes / 1 s) * 30 s = 6,980 shares (3 sig figs)

A:
Shares by you: (1 share / 42.9 s) * 30 s = 0.699 shares / GPU = 0 shares
Payout: ( 0 shares / 6980 shares ) * 50 BTC = 0 BTC

B:
Shares by you: (1 share / 4.29 s)  * 30 s = 6.99 shares (tough luck) = 6 shares
Payout: ( 6 shares / 6980 shares ) * 50 BTC = 0.430 BTC

Scenario 2:
Pool finds a block in 180 seconds.
Total shares: (1 share / (2^32) hashes) * (1E12 hashes / 1 s) * 180 s = 41,900 shares (3 sig figs)

A:
Shares by you: (1 share / 42.9 s) * 180 s = 4.196 shares / GPU = 40 shares
Payout: ( 40 shares / 41900 shares ) * 50 BTC = 0.477 BTC

B:
Shares by you: (1 share / 4.29 s) * 180 s= 41.95 shares / GPU = 41 shares
Payout: ( 41 shares / 41900 shares ) * 50 BTC = 0.489 BTC

Scenario 3:
Pool finds a block in 3600 seconds.
Total shares: (1 share / (2^32) hashes) * (1E12 hashes / 1 s) * 3600 s =  838,000 shares (3 sig figs)

A:
Shares by you: (1 share / 42.9 s) * 3600 s = 83.9 shares / GPU = 830 shares
Payout: ( 830 shares / 838000 shares ) * 50 BTC = 0.495 BTC

B:
Shares by you: (1 share / 4.29 s) * 3600 s = 839 shares / GPU = 839 shares
Payout: ( 839 shares / 838000 shares ) * 50 BTC = 0.506 BTC

In conclusion:

Stated by my data, the highest hash rate obtainable by one card vs multiple smaller cards will almost always yield more BTC over time.

DISCLAIMER:  This is a lottery.  You can get get a share the first hash you do with any card.  This data represents results over a large period of time.

This is a picture of the results in an excel spreadsheet:



This can be related to 5870's vs 5970's.

~400 Mh/s to ~350 Mh/s
This theory is also in favor of the BFL 850 Mh/s miner.  Go figure.
32  Other / CPU/GPU Bitcoin mining hardware / Minimizing Rejects on: February 24, 2012, 06:12:46 AM
I had my 5970 running at about 0.1% rejects for ~ 48 hours.

When I added my 5850 into the mix, my rejects on all cards are up to about 0.5%

What are the most effective ways to minimize rejects?

I've tried playing with my voltage and it seems to have no effect on it.
33  Other / CPU/GPU Bitcoin mining hardware / Radeon 5850 stuck at 75-80% on: February 21, 2012, 07:35:58 PM
So, I just got a 5850 and I'm running it on bamt with my other 5970.  Oddly enough, it won't hit 100% load.  I've tried running it without the 5970 in the board, and it does the same thing.  Psu is 750w corsair and runs perfectly fine.  Any ideas?

34  Other / CPU/GPU Bitcoin mining hardware / new 5850 for $146 on: February 16, 2012, 06:02:21 AM
http://www.ebay.com/itm/400276694236?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_2981wt_1136

I bought one of these.  Comes with a 1 year warranty.  Just wondering if it was a good deal or I got ripped off o.o

It was a "can't-resist" moment Cheesy
35  Other / CPU/GPU Bitcoin mining hardware / 5970 temps, clocks and voltages on: February 14, 2012, 03:40:28 AM
So, all you 5970 owners, what do you run your 5970's at?

I currently have one running at 775mhz @ 1.025v & 50% fan @ 65C

Trying to see how low I can go without boot looping myself Cheesy

Post'em!
36  Other / Beginners & Help / 5970 problems. (cgminer + fan, Xp/7 compatibility) on: February 07, 2012, 07:15:55 PM
I have two problems:
1) When I try to use autofan in cgminer with my 5970 and 6870 in the same computer, only the 6870 is controlled.  I haven't tried it seperately, but I feel this is a problem because the two  gpu's rely on one fan.

2) I have tried running my 5970 on a clean install of windows XP, with only the SDK driver installed and cgminer running, and I get some pretty erratic results.  One gpu runs fine at 320 mhash, but the other one runs at ~150 and racks up about 1,000,000 HW: errors/min.

Miraculously the 5970 runs perfectly stable at 850 oc & 1.03v in windows 7.

This is my face:  Huh
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