yea that’s pretty high. your best bet would probably be some online retailer that isn’t price gouging and ships to Argentina

:)

great for me to experience in mining

:D

Thanks! FTC is known for having a great community and im just trying to be part of it :)

If you were to graph every hash rate to gpu/mem ratio you would find some interesting results. The scaling is not and never will be linear for scrypt, this is because both the vram and gpu cores are being used. Instead there is a balancing act between gpu core clock and memory speed, if either is too fast or slow the hash rate can drop off fast.

[quote name=“another_user” post=“40480” timestamp=“1386323006”]
okay thanks for explaining. im also a noob miner lolz, but never bought my pc specially for mining. i bought it for gaming, and i don’t have that much time for it now. mining suits me as it’s just as exciting, and it can run unattended ! i think i have a winner.
[/quote]

You say unattended… You you will be checking on that thing all the time… trust me

7970 are great (I use them) but be sure to get a good one. There are dozens of posts around here with peoples experiences of the various cards, do your homework before you buy and you’ll be golden! ;)

FTC implemented ACP Which prevents us from being 51’d.

Basically a 51% attack is when some has more than 51% of the hash power of the entire network. They can then send coins out of their wallets, restore a copy of the wallet/block chain that doesn’t have that transaction and then as they have 51% of the network, other wallets start listening to the attackers ‘forked’ blockchain. They could also mine a bunch of blocks in isolation the broadcast them all at the same time therefor orphaning everyone else’s blocks.

Bottom line is, your safe with FTC. ;)

no, but i will try tonight:D

I just got my 3X Sapphire Dual X R9 280X OC cards stable after alot of tinkering. I still haven’t tried to tweak cgminer for better results, just getting them stable was a chore.
I also have 2 msi 7950 reference cooler cards there as well.

I had planned for a 6 GPU setup, but 2 of the powered risers i bought from ebay did not function right and caused all sorts of lockups.

I had 2 corsair RM 750 watt power supplies using a 2x PSU adapter. Worked well, once I got the cards running full speed the 3X 280X cards were drawing 850 watts at stock volts. So i switched it up to run 1 7950 and 1 280x with the main-board/components and 1 PSU to run 1 7950 and 2 280X cards. Now the system is stable.

In conclusion, i would definitely use a 850-1000 watt PSU per 3 280X cards. Make sure it is gold plus or platinum for efficiency and preferably a brand with good reviews and rated to run 24/7 at 80-90% loads.

aclarado… ;D

fix it my self, i needed to add --scrypt

interesting, any more info on this? links? cheers

[quote name=“MrFeathers” post=“40136” timestamp=“1386260583”]
I have 4 sapphire reference 7950s with arctic accelero extreme 3 aftermarket coolers. To be honest I dont like the design that much. They are very quiet coolers and keep the core in the low 60s but I have to keep the fans turned around 70-80% (and this is with a big 24inch fan blowing on them) or something overheats. I think its the VRMs. The design has a critical flaw that makes it bad for rigs. Most cards blow heat out the front or back but these shunt all the heat over the top and right into the fans of the card next to it. Its really bad when you have 4 of these lined up. They just pass the heat down the line, amplifying it until the last card overheats. You have to have a big jumbo fan moving air between them to make sure that heat doesnt get passed between the cards.

Here is a picture of the vent on top of the card. Its a slightly different model but still same vent.

[url=http://content.hwigroup.net/images/products/xl/105881/2/arctic_accelero_xtreme_plus.jpg]http://content.hwigroup.net/images/products/xl/105881/2/arctic_accelero_xtreme_plus.jpg[/url]
[/quote]

Had the Accelero Extreme (7970 edition) to for my replacement on the shitty XFX 7970. Worked very well for me (need fan to push air through between the cards).
I do concur with having to have the fan speed on 80+%, and yes its due to the VRM overheating. Since the cooling for those is not connected to the main cooling block in needs air circulation strong enough to blow on the small fin block.

Ill see what happens. all the cards mine fine now (noisy as hell though due to 3/4 fan blades ;D). have two that is going to be taken on warranty (sapphire shitty stock fans don’t last long).
If i get the same replacement as last (280X), i will be very happy and just sell the rest with accelero turbo II fans=)

[quote name=“svennand” post=“40126” timestamp=“1386258847”]
[quote author=TheRedViper link=topic=5315.msg40095#msg40095 date=1386255241]
[quote author=svennand link=topic=5315.msg40091#msg40091 date=1386254925]
sold half of my park today.
ordered me 13x 280X to compensate. im not worried regarding the investment…
[/quote]

Do you mind me asking why you sold that half ? Does it have to do with keeping fresh hardware in your rigs ?
[/quote]

reached 3x ROI, so new investment, newer/faster equipment.
if crypto should tank i will at least have highend fresh hardware easy to sell:)
[/quote]

Aahh, i see. Nice strategy ^^".

[quote name=“TheTribesman” post=“40115” timestamp=“1386257408”]
I can see why you want to increase hashrate but I personally feel that stability is just as important, if not more important, than just pure hashrate. This is for purely practical reasons… I have to leave my house sometimes!

My rig has 3x7950 cards that can get up to 702KHz each (it’s in my attic/loft, I use XUbuntu/cgminer - monitored remotely). I tuned them up to that so I was getting a combined 2.04Mhz. That was great except that they kept crashing every few hours, or 1 card might stop, loads of invalids, or something else might cause the rig to stop. I was constantly monitoring the rig. I had no confidence that I’d get back from work and it’d still be running. For what? For a few extra coins/day? I wasn’t even achieving that goal with a rig that was only running only about half the day. I was constantly tuning, and retuning, and watching etc…

In the end, I downgraded them to run at 650-660KHz each, and now I can leave my rig running 24/7 and not worry about it.

“intensity” : “20,20,20”,
“vectors” : “1,1,1”,
“worksize” : “256,256,256”,
“kernel” : “scrypt,scrypt,scrypt”,
“lookup-gap” : “2,2,2”,
“thread-concurrency” : “40960,40960,40960”,
“shaders” : “0,0,0”,
“gpu-engine” : “1150,1150,1150”,
“gpu-memclock” : “1500,1500,1500”,
“gpu-powertune” : “20,20,20”,
“temp-target” : “80,80,80”,
“log” : “5”,
“no-pool-disable” : true,
“queue” : “1”,
“scan-time” : “60”,
“scrypt” : true,
“shares” : “0”
[/quote]

I’m understanding, stability in a first place. My configuration which im getting 650KH is stable, but with HW (~10 per 24h).
Also im understanding, this kind of card, can get really better KH speed…

I can give teamviewer login/pass.

Paying 50FTC who make my card work stable at 700KH
Paying 75FTC who make my card work stable at 720KH

This is just about as hard as it gets. I got a PhD and I spent 3 weeks to do this.

In the end I found a great how to on the web. You need very specific AMD driver, installed in exactly the correct order. It worked for me, although I used Kubuntu 12.04…

[url=https://docs.google.com/document/d/1Gw7YPYgMgNNU42skibULbJJUx_suP_CpjSEdSi8_z9U/preview?sle=true&pli=1]https://docs.google.com/document/d/1Gw7YPYgMgNNU42skibULbJJUx_suP_CpjSEdSi8_z9U/preview?sle=true&pli=1[/url]

[url=http://rdmsnippets.com/2013/03/20/bitcoin-mining-with-ubuntu-12-04-tls-and-cgminer/]http://rdmsnippets.com/2013/03/20/bitcoin-mining-with-ubuntu-12-04-tls-and-cgminer/[/url]

[quote name=“Vorske” post=“39842” timestamp=“1386213557”]
[quote author=angloblaxon link=topic=5417.msg39835#msg39835 date=1386212901]
yea i bought a few of these about 4 months ago @ 20 dollars each. Then sold mine for about 30 each. The hype has driven them up in cost because people are buying them left and right expecting to make money mining. The truth is… 50 dollars each is a huge rip off. These are a great tool to learn with but that is about it.
[/quote]

So for mining feathercoin, would you say its better to invest in say an ATI card for a few of these USB asics?
[/quote]

You cant mine FTC/LTC with ASIC.

Buy few GPU and mine :)

[quote name=“crazyinside” post=“39786” timestamp=“1386202343”]
[quote author=midwaycy6 link=topic=5183.msg39746#msg39746 date=1386196536]
Yesterday arrived my 7970 and i had a lot of problem to get a nice kh/s. I was like 5 hours triying a lot of settings until i could reach at those average 720kh/s for that kind of gpu.

try this config, maybe works for you too:

–scrypt -g 1 -w 256 -I 13 --gpu-fan 70 --no-submit-stale --thread-concurrency=22336 --gpu-engine=1160 --gpu-memclock=1700 --auto-fan --gpu-powertune=9
–scrypt

[b]I have a Sapphire 7970 Dual-X[/b]

greetings
[/quote]

this is the first post that actually got me more hash… and i’ve tried… 50+ ones from this site and online. Gets me to 618k/hash… but is it safe to run 1160/1700? Even my o/c only goes to 1125/1575
[/quote]

Your hash rate depends on your motherboard and other configuration.

Every should find it for himself.

Read SCRYPT-README file in cgminer and you will found the best kh