No, you can use whatever you want with 7950. I'd suggest CGminer, you just have to tweak a couple of things. First of all, you Can't go over 13 intensity for starters. Set shaders, set vectors for 1, set lookup gap to 2.
For 7950 the sweet spot should be around 1.33 core to memory ratio.
Just used the new version of cgminer this morning, core:mem ratio of 0.68, only got 280 kh/s per card with all those settings. The 7970s and 7950s are very different with cgminer. |
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No; I'll try to make it portable in the future though.
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Raising GPU threads will not increase thread_concurrency indirectly, it just adds another thread calling the memory and working the ALU. In reality the GPU scheduler seems efficient enough that by just setting one thread, we get pretty good values for hash rate (usually the same or better than 2 threads for all my cards).
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PM sent. It's interesting to see that so many miners want to keep the chain GPU only. I think it might be a good idea to have a technical consortium with LaSeek and Coblee to try to figure out ways that we can maintain this property if the network really finds it desirable, and possibly implement this at block halving time (~800k blocks into the chain).
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That's what I thought. Does 8192 give you similar results to --shaders 2048?
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Note I also improved on the kernel slightly too in the latest version.
Ill give it a spin tomorrow with my 7950s and 6970s |
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In a day or so we will hit the highest LTC difficulty ever, 80+
what is the previous high? In the 50s if memory serves me correct. |
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Think about it. In the main loop, there's 1024 memory fill rounds and 1024 memory lookup rounds (2048 rounds total). For each round, some processing can be done in parallel but each round needs at least 50-something cycles. So that's 100K+ cycles to get the result. The max frequency of an FPGA may be 200MHz, so 200MHz/100K cycles is something like 2K to 3K Hahs/s. Pipelining: All of this needs a 128K memory block for each try, so that's 128KB times 100K+ cycles. So we're talking gigabytes of memory. Access to memory from one round is something like 512 or 1024 bits wide (I don't remember exactly), so pipelining is pretty much impossible. The only thing good at this is a general CPU running at much higher frequency, using SIMD instructions like MMX. Or a GPU massive parallel and memory bandwidth. I did think about doing FPGA (note that I did a successful SHA256 'Bitcoin' implementation), but I did the math and we're going nowhere with LTC scrypt algorithm  One of the FPGA developers sent me some details of his optimizations, but I don't know of their validity. I'll forward them to you in a PM tomorrow. |
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These are great rates. Can anyone tell me what the memory usage on card is? A bug was recently fixed that allowed thread_concurrencies of >8192 but <12000 to be used in cgminer, so I'm curious as to what the thread concurrency actually is (probably either 8192 or 10240)
Can someone try --thread-concurrency 8192 and --thread-concurrency 10240 and see if they produce the same results? thanks.
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In a day or so we will hit the highest LTC difficulty ever, 80+
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With the possibility of Litecoin FPGAs coming out in the next few months, and then ASICs being a year or two off, do you feel like the chain should have future optimizations to prevent FPGA or ASIC mining? Or would you be fine with ASICs/FPGAs coming out and subsequently purchasing them?
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A friend of mine has a little problem See pictures:   What is he doing wrong and get all these invalid shares ? Your overclock is too high, memory is messed up, or thread_concurrency is too low (but it shouldn't be). For some reason too if I use cgminer to mine with I get invalids for my 69xx cards, but if I use reaper it's fine. No clue why this is. Also enabling stratum will reduce stales but not invalids. Also your GUI is way larger than mine, I'll have to figure out why that is (it's supposed to be smaller by default). |
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Yeah, sorry about that. In the next version I will add tool tips to specify what the general values should be for the different options.
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Pm if you're in need of a reviewer who is well known here, I have meter devices to measure power draw too.
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Connection problems, assumbly with the pool. By the time you submit the shares they are stale, but you are still mining them. Try my guiminer-scrypt and a stratum pool like ltcmine.ru.
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I don't have a 7970 on hand to test with (if someone wants to let me borrow one, I'd love to try tuning it and then mail it back to them). Everyone seems to be getting different results for them, and I've only been publishing those from others.
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You need to use reaper for high thread concurrencies, cgminer does not work
thread-concurrency for a 7850 should be between 14000 and 17000
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there's a direct mega download for my miner frontend here |
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