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Are you running the cards all on the same rig? LTC mining is GPU memory bandwidth intensive, if all 4 cards are running at only 1x or 4x or even 8x you'll probably be bottlenecked.
Try using only one GPU in running at 16x.
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these settings get 600kh/s+, which is the estimated kh/s rate for one of these cards by their memory bandwidth:
worksize 256
aggression 13
threads_per_gpu 5
sharethreads 18
lookup_gap 2
gpu_thread_concurrency 10240
you need the latest sdk and 12.6+ ati drivers (tried with 12.6 and it works well, not sure about 12.7 but those are probably okay too)
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Atm the reaper opencl code sucks. My 5870 generates about 420kh/s, to use as a reference. So it should be getting like 6-700 or more from a 7970.
The good 7970 settings are listed in my post, it's an issue of both drivers and the correct thread concurrency/quantity |
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The request was for a GPU miner so I didn't intend to create a cpu miner.... Having said that, I incorporated the CPU mining code anyway for its sanity checking, but you won't be able to use it unless you compile it yourself once it's released, just like the current cpu mining code. Here's what I'm getting so far from 4x7970s. cgminer version 2.5.0 - Started: [2012-07-21 01:59:22]
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(5s):1491.8 (avg):1391.3 Kh/s | Q:157 A:16893 R:117 HW:0 E:10760% U:1276.5/m
TQ: 15 ST: 16 SS: 0 DW: 108 NB: 10 LW: 2508 GF: 0 RF: 0
Connected to http://lc.ozco.in:9332 with LP as user ckolivas.0
Block: 3481059ff985cf07dc7c223dba82c6c4... Started: [02:10:37]
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[P]ool management [G]PU management [S]ettings [D]isplay options [Q]uit
GPU 0: 54.0C 5371RPM | 364.5/346.6Kh/s | A:4176 R:24 HW:0 U:315.54/m I:-3
GPU 1: 54.0C 5417RPM | 374.6/350.2Kh/s | A:4294 R:32 HW:0 U:324.46/m I:-3
GPU 2: 52.0C 5308RPM | 374.3/349.2Kh/s | A:4295 R:24 HW:0 U:324.54/m I:-3
GPU 3: 48.0C 5295RPM | 381.0/352.4Kh/s | A:4228 R:37 HW:0 U:319.47/m I:-3
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Note that you can increase the hashrate further, on both this and reaper BUT it starts generating garbage. I know people have claimed higher hashrates, but be wary of these claims and look at that successful share submission rate. My mining rig is really struggling behind the weak wifi it runs off when trying to submit 1300 shares per minute. I'll be tweaking the command line settings so they mean something more useful though since intensity of -3 will be rather confusing, so I'll change the scale for scrypt. There are settings for which reaper does not return high quantities of stales at high aggressions with few stales, they were being posted up on BTC-e the other day. As I recall the thread concurrency used was something around 10240 (maybe slightly higher, but still around 10k). edit: here they are, for ~450kh/s worksize 256 aggression 13 threads_per_gpu 4 sharethreads 18 lookup_gap 2 gpu_thread_concurrency 8192 and for 650kh/s worksize 256 aggression 13 threads_per_gpu 5 sharethreads 18 lookup_gap 2 gpu_thread_concurrency 10240 You must use the 12.6 drivers and the latest SDK to get these hash rates |
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Did you notice that that chart only considers 6 pools? And they are not even the largest ones.
In addition, many large miners have switched to solo because of the recent DDoS attacks against pools.
Cool, thanks for the information. |
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 Something is going on... The chain may already be forked. Coblee, are you keeping an eye on this? |
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Whoever you are should realise how useless that comment is ...
? The OCL code in reaper is pretty poorly optimized for the GCN architecture, that is well known?? Cayman XT has about 25% less memory read bandwidth than Tahiti XT, I would expect that Tahiti XT should perform faster than Cayman XT. |
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I read that an ASIC to mine LTC would cost much more than BTC's ASIC. How much more? Why is that?
yeah, it cost much, because of LTC mining need high speed memory, BTC mining not... the hardware costs will be higher ? how much ? if it needs about 1G DDR3 ram, then it can cost about 10USD per memory more, and some memory controller is needes, may be about 25USD more in HW ? and some more time spent with writting code... Well, quad channel DDR3 is maybe 68GB/s, and is about 1/4th the bandwidth of a 79xx series GPU... A quad channel DDR3 controller would probably run about $30. Let's say that it's an ASIC similar to the BFL labs one that does 800MH/s and could do 100KH/s if the RAM speed were not limited, but is limited by RAM speed/bandwidth to 1/4th that, so 250KH/s. Now, quad channel RAM fully loaded (4x1GB DDR3 modules) with 4 sticks will probably run about 70W at 1.5v (given 6W per 0.25V from Tom's Hardware DDR3 1.25V vs 1.5V efficiency guide). That's 70W + 80W = 150W, even without the additional wattage for a memory controller. Corsair quotes 1.5V memory as using 11W per stick loaded, so where ever you get the number from, it's still not negligible. 250KH/s for 150W, while an undervolted 7970, without even optimized software, gets about 500KH/s at 125W neglecting the additional 100W or so for motherboard/RAM/etc. Although there are a lot of assumptions here, it seems pretty clear that as long as LTC mining is bandwidth limited ASIC devices will be expensive compared to GPUs in both cost to buy and operate. |
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Thank you for pointing that out! It's been fixed
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Hello, My friend tried to register on here to sell her stuff but couldn't post because she's new. She asked me to put it up here. All the soap that is on http://pixel-8.ca is for sale here in BTC. Thanks Sample pics:    |
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The naysayers still have yet to present any real arguments against Litecoin other than "Bitcoin is just as good and works."
I hear the client is trash. Haven't seen it first hand. The client is just bitcoin-qt, same as regular bitcoin client more or less. |
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Litecoin will have its day. Unfortunately just not today.
LTC had it's day, and it was almost literally a day. RIP LTC. No, the market is much healthier now. Mining is no longer 100% more profitable than bitcoin, the price is stabilizing and the network hash rate isn't going crazy but it is going up. The most important thing is that the number of buy orders is still 1.4k BTC, almost as high as it was last week. People are taking LTC more seriously now and want a bigger chunk of it if the price falls. I expect the price will climb over the next 3 months slowly. |
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Q: Do you have the CUDA toolkit and SDK installed? It doesn't work for me unless they are.
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BTW guys, this still works =) figured with the recent uprise in LTC, Id bump it up if anyone can find command and control remote CPU mining LTC useful =)
you should add reaper too with adjustable config |
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Don't you have over a million LTC
Just saiyan
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try
aggression 17
gpu_thread_concurrency 8192 ((note: GCN has 64 threads per CU, and 7970 has 32 CU so 64 threads * 32 CU = 8192))
sharethreads 8
lookup_gap 2
I've seen a few people also recommend gpu_thread_concurrency be 32768 (4*64 work items per CU), so try that too
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it would just have to be inexpensive DRAM instead of SRAM. Should be doable because of periodic and deterministic memory access.
Yes, but the whole point of that is to make the whole thing irritatingly expensive to make an ASIC for since these are the things that most video cards already have in massive abundance. |
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3btc to bitscalper
at the time it was only worth $6
not technically lost, but gone forever.
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