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Showing 15 of 15 results by zamarok
Re: "Other" is getting dangerously close to 51% of the network hashrate
The thing is with Other, is they're not in the same pool. So if the other hash rate topped 51% it wouldn't have the same effect as deepbit or another pool.
The thing about this joke is that it went over your head! lol
How do people get their 6950s to go so fast? I've got a PowerColor 1Gb 6950, 800Mhz stock running at 850, 1250Mhz RAM and 0% power control setting. If I push it to 875 the PC locks up and reboots.
Temp is 65C and fan speed 56%. Is it safe to push the power control setting up to 20?
I tried to unlock the shaders by ripping the BIOS, changing the 6950->6970 setting and uploading back again. No dice. Card requires the BIOS switch to be flicked before the PC will boot.
How much difference to power consumption does reducing the memory speed through reflashing the BIOS make?
Temp is 65C and fan speed 56%. Is it safe to push the power control setting up to 20?
I tried to unlock the shaders by ripping the BIOS, changing the 6950->6970 setting and uploading back again. No dice. Card requires the BIOS switch to be flicked before the PC will boot.
How much difference to power consumption does reducing the memory speed through reflashing the BIOS make?
To push it further, you need to give it more power; turn up the voltage. Only touch the voltage if you know what you're doing. If you're new to overclocking, I recommend you do some research, and experiment on a less-expensive card. Your fanspeed should be based on a curve ideally, not a set value. If your temps are below 90C, you're safe.. but I wouldn't recommend running at that temp 24/7. I would shoot for 75C max as a safe 24/7 temp.
Only the 2GB cards can be flashed to a 6970 BIOS. That's why most people don't buy the slightly cheaper 1GB version. I'm actually using a 6950 BIOS that was patched to unlock the unused shaders... I'm not sure if the 1GB 6950 can use that one, but it's worth a look.
Well... Isn't share submission somewhat related to time? My computer is running 24/7, so I don't see why I'd get less shares on longer blocks? The front page links to http://forum.bitcoin.org/?topic=1976.msg50002#msg50002, where Slush explains it is a score based system. Are you referring to another link?
I'd be interested in your 6950 configs. As I said, I'm a casual miner, and I mine on my primary rig, so I don't want to push the overdrive too hard (I'm F'ed if I burn it). I'm with -v -w 128. I have one of those new low cost single Bios Saphire 1GB 6950 cards, whose shaders can't be unlocked (at you flash with no safety net). I've pushed the OC up to 840Mhz, where I mine at 330MH/s, with the card @ 79°. Any way to get more bang out of it without pushing the clocks further?
I'd be interested in your 6950 configs. As I said, I'm a casual miner, and I mine on my primary rig, so I don't want to push the overdrive too hard (I'm F'ed if I burn it). I'm with -v -w 128. I have one of those new low cost single Bios Saphire 1GB 6950 cards, whose shaders can't be unlocked (at you flash with no safety net). I've pushed the OC up to 840Mhz, where I mine at 330MH/s, with the card @ 79°. Any way to get more bang out of it without pushing the clocks further?
I was talking about http://mining.bitcoin.cz/ which is Slush's Pool's website. I don't 100% completely understand the math behind it myself, so I hope someone else replies to this thread and explains it in-depth.
My 6950 setup:
Core clock: 1,000 Mhz
VRAM clock: 400 Mhz
CCC OverDrive: +20%
Core voltage: 1260 mV (I'm still tweaking this because I think it can go lower)
Temperature: 70 C
Fan speed: 70~80% (depends on time of day; ambient temps are hotter mid-day)
Arguments: -v 2 -w 128
The card I have is a Sapphire 2GB reference card, which is basically a 6970 with some of its shaders locked. I patched my BIOS to unlock the shaders, so it's essentially an overclocked 6970. VRAM isn't really used in bitcoin mining, so underclocking VRAM makes your GPU require less voltage. This is also my gaming rig... all I have is a crappy backup laptop, so I'm screwed if this burns out too lol, but 70C is a fine temp. I highly recommend forming your own fanspeed curve based on GPU core temp. You can do this with Afterburner or Trixx easily, in the fan control settings. That way your fanspeed will be dynamically adjusted based on your GPU core temp.
Oh, and open your case and point a table fan at your card. Not directly at it, but at an angle. My fan is on 'low', angled to blow the heat from my GPU out the back of the case. Having my case closed up trapped all the heat inside... the extra fan allowed me to overclock a lot higher.
It's about share submission, not time. I don't know if Slush's pool has stats you can view, but if they do, look at your shares for each block and multiply it by how much Slush's Pool pays per share. You can read about it literally on the front page of Slush's Pool's website; he explains it quite well.
By the way, your 6950 can do at least 400 easily. Mine is at home doing 430 MHash/s right now.
By the way, your 6950 can do at least 400 easily. Mine is at home doing 430 MHash/s right now.
If the bubble bursts, the market would be flooded with cheap GPUs so you are not likely to sell it at the price you expected (not even sell it).
There is an upside to this for every PC gamer out there. If the BTC bubble bursts, I'm buying like four 6990s for dirt cheap and playing Crysis 2 in an eyefinity setup lol
The solution:
Enable power management to +20 in CCC....
I'm running unlocked @ 900 core: 380-400 Mhash/s
Donate if this fixed your problem:
1L3GxCRZwXEh8VwpPAociZQdTkhSHKGMoY
Grtz
Enable power management to +20 in CCC....
I'm running unlocked @ 900 core: 380-400 Mhash/s
Donate if this fixed your problem:
1L3GxCRZwXEh8VwpPAociZQdTkhSHKGMoY
Grtz
Dude, I'm the one who posted the solution in the post directly above your post >_> How are you going to accept donations for posting my same answer right under my post?
$1 million can buy enough mining hardware to take over the bitcoin network and basically ruin it for everybody. Assuming you can even find that many GPUs, which you won't on the open market.
You would need about 3,500 mining rigs, each with 3x6990 AMD cards. I haven't done the maths, but you can probably buy that for $1 million. Edit: More like $5 million.
That's not technically a DDoS attack though.
You would need about 3,500 mining rigs, each with 3x6990 AMD cards. I haven't done the maths, but you can probably buy that for $1 million. Edit: More like $5 million.
That's not technically a DDoS attack though.
When you buy large quantities for lots of money, you usually get a discount. You could negotiate a contract with Sapphire, and have them make you a bunch of your desired GPU for cheaper than retail price.
430 Mhash/s
Temps: 75 C, fan speed: 80%, core voltage: 1.275 mV
1,000Mhz, unlocked shaders, underclocked RAM.
How does one know if it's a 'reference card' or not?
Temps: 75 C, fan speed: 80%, core voltage: 1.275 mV
1,000Mhz, unlocked shaders, underclocked RAM.
How does one know if it's a 'reference card' or not?
zamarok, could you please post the exact model and manufacturer of your card? I am highly interested.
Sure. Here's the exact line from my NewEgg email invoice:
14-102-914 VGA SAPPHIRE|100312SR HD6950 2GB R
And I bought it February 12th. I bought it for gaming, and only discovered bitcoin mining in the last few days. Glad I bought this model!
I'm at work, and it's at home mining 430 MHash/s for me. I only have the stock heatsink/fan, but I keep a regular table fan angled at it.. temps staying steady at 73C @ 1270 mV core voltage. I will keep tweaking it to see if I can get more Mhash/s without heating it up too much.Using the latest poclbm with GUIminer, CCC 11.5, -v 2 -w 128, 1,000 Mhz core clock and 400 Mhz VRM clock, and most importantly +20% OverDrive from CCC. When I first turned up OverDrive, my MHash/s went from about 335 to 390. Oh, and of course I patched my BIOS to unlock the extra shaders. Overclocking the core and underclocking the memory took me the rest of the way to 430.
Literally just type those exact same words into Google and you will find everything you need.
Not to be rude, but no one wants to type out answers to your questions when all of the information you seek is easily accessible in the Bitcoin wiki.
https://en.bitcoin.it/wiki/Main_Page
Not to be rude, but no one wants to type out answers to your questions when all of the information you seek is easily accessible in the Bitcoin wiki.
https://en.bitcoin.it/wiki/Main_Page
I doubt you will get 100 Mhash, but then I've never tried with that GPU.
BTC Guild is great. You can get a payout at 0.01 BTC. Any BTC past the hundredths place is truncated, but kept in your BTC Guild 'wallet'.
BTC Guild is great. You can get a payout at 0.01 BTC. Any BTC past the hundredths place is truncated, but kept in your BTC Guild 'wallet'.
The value of the Bitcoin is tied to the security of the network. If the network were to lose security like that, I feel like everyone would sell their BTC for bank currency, then the BTC would lose value.