1 GPU is connected to the "non-modular" PCIe's that come with it, 1GPU is connected via modular.
For optimally spreading the load, connect the 5850 (lowest power consumption) to the modular cables to 12V1 (shared with CPU), and connect the 5870 to the non-modular PCIe cables. This will get rid of the PSU noise. More info: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=89which says: "Well, the ATX and 8 pin EPS connectors are on 12V1, while the two 6+2 pin PCI-E connectors are on 12V2." |
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TenthReality: you may be overloading your PSU if you somehow managed to plug the 2 video cards on the same 12V rail as the rest of the system. This Corsair 1000HX is not a single rail 1kW, but has two 12V rails of 480W each. When fully loaded, your system may be over 480W:
151W (5850) + 188W (5870) + 125W (1090T) + ~50W (estimate for rest of the system) = 514W > 480W
However, if you have done your wiring in a standard way, the ATX12V connector for the CPU should be a separate rail. In that case, it is still possible for you to be over 480W if you overclocked the video cards.
Bottom line, check your PSU's manual. Make sure you put the 2 video cards on 2 different rails.
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I am happy with my current business model & price.
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That link doesn't really prove anything though. Of course manufacturers use powers of 1000 -- they can claim that their hard drive is 300GB when it is, in fact, only 279GB as measured by pretty much every operating system. Also, AFAICT, the article is just plain wrong when it comes to RAM modules; if the amount of RAM on a chip were not a power of 2, it just plain wouldn't work.
You read incorrectly. It does not talk about RAM capacity, but RAM throughput ("A PC6400 (as in 6400 MByte/s) memory module is 6400 * 10^6 byte/s"). I challenge you to name a single item in that list that is false. You won't find any. Surprising, huh?  |
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I actually measured 746 Mhash/sec on a Radeon HD 6990 at "880MHz" (BIOS switch at position 1). This is higher than the theoretical 723 Mhash/s I would expect for this clock due to AMD PowerTune constantly dynamically adjusting the clock which averages higher than 880MHz.
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hdminer is only ~5% faster than the best publicly available miners nowadays, so in a sense, it is not worth 400BTC if you are a small-scale miner (less than a handful of GPUs). However I plan to implement optimizations soon (have been wanting to for a while), which should bring another +5% improvement or so.
Bumping this thread because I tested it on HD 6990 (see original post for perf numbers).
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I agree with you goatpig. I said from the beginning that price-wise the 5870 is more economical.
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Although single gpu cards o/c much better, so I wonder if a 6990 combo could beat four 5870.
Of course it would. Bitcoin mining scales linearly with the # of GPUs, so a pair of 6990 at 880MHz would achieve 1446 Mhash/s, compared to 1328 Mhash/s for four 5870. It is kind of pointless to argue which one would be faster when overclocked beyond the factory setting, because the overclocking room varies so much from card to card, and with the type of cooling (air, water, etc). |
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5870's can squeeze 360mhash each with an average o/c on stock voltage.
Apples vs. oranges. The 6990 too can easily be overclocked beyond the "factory" 880MHz. |
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Are you certain? I'm almost positive two 5870s will beat a single 6990 by a good margin at pure hashing power. Have you seen a 6990 hit over 700Mhash/s?
One 6990 beats two 5870 because the VLIW4 architecture is easier to fully exploit than VLIW5 arch. I benchmarked my miner, hdminer: - One 6990 (switch at position 2, ie. 830MHz): 683 Mhash/s
- One 6990 (switch at position 1, ie. 880MHz):
723 Mhash/s was an error, I measured: 746 Mhash/s - Two 5870: 664 Mhash/s (332 Mhash/s each)
However, price-wise it makes more sense to buy two 5870. |
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noagendamarket can be trusted. He mailed me the RFID antenna. I received it today. Thanks!
*Edit*: does this transaction represents the first international purchase of a physical good, using Bitcoins? That'd be cool.
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So how much would such an ambigram be worth to you guys?
(I think you may underestimate the amount of time to make something like this.)
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I enjoy designing ambigrams. Look at the one below, it reads as "Vickie", or "Mat" when turned upside down!  Give me a pair of first names and I will deliver you a custom-made unique ambigram as a computer image file. Feel free to incorporate it in real-life objects or pieces of arts. Take it to a local artist who can turn it in a painting, a baker to make a wedding cake bearing the ambigram, a jewelry designer to engrave it on a ring, the possibilities are endless! This is truly one of the most unique gift you can offer to a precious lover or friend. I will ask 450 BTC per design. Email me m.bevand@gmail.com |
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I'm curious, how did you find this thread? Were you a Bitcoin lurker?
Most likely via the HTTP Referer of the dozens of us who clicked that link. |
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Doh! I didn't see the "Shipping for International Customers" section on your website. Oh well. At least I helped contribute a little bit to the Bitcoin economy.
On a related subject, please Robert, add Bitcoin as a payment option to your site :-)
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thank you..anything alse i can do for you。。
No that's all  |
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Mostly it is too much hassle and risk. I assume you don't want deliver the cards to me. So I would have to deal with you for the Paypal conversion, then another person for the delivery. Plus both of us would be subject to Paypal's risks, nullifying the advantages of dealing in Bitcoins only...
Anyway I have reflected on this and have decided to buy cheaper used HD5970s instead.
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That said, does anyone know where to buy 36 AWG magnet wire in small quantity? (Mouser sells 6400 feet minimum, or half a pound!)
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