Topic: ASIC Testing on Scrypt? - page 7. (Read 17434 times)

He also appears to be clueless about the BIOS and AMD driver limits which make 16 GPU per system an impossibility.  In theory using PCIe bridge is possible but nobody with any capital dumped it into custom GPU boards when you could dump it into custom ASICs and make a fortune (in the early days). 

You've never run a farm judging by your comments. Let me give you a clue why it's unique for a single location: Heat & Power.

Please...  How much do you think it really costs to slap together a large GPU farm worth of 4 layer boards with a handful of PLX PCIe bridge chips and PCIe x16 slots with only one lane connected to each?  Handling fanout of REFCLK and escaping the BGA packaged PCIe bridge IC's is about the only thing requiring any skill at all, the rest is just dirt simple impedance balancing and length matching of the lane data signals (which is certainly not rocket science).

Here, I'll throw everyone a bone here.  There are many consumer motherboards currently on the market whose chipset doesn't actually require that all 16 lanes of a PCIe x16 slot be merged to one endpoint.  That means all 16 lanes can be broken out to 16 separate single-lane PCIe devices.  With the correct motherboard, it works just fine to hack up some ribbon cable PCIe risers to split a single x16 slot (preferably one at the edge of the motherboard so you can position GPU's both above and below the motherboard) to 16 GPU's.  Dividing up the REFCLK signal to each of the 16 GPU's is the only thing requiring any active electronics and design skill (and really, not all that much), but given that REFCLK isn't synchronous to the PCIe lane data signalling and runs significantly slower (100MHz), it's not complicated to pull off either.  You can also easily pull it off as a PCIe backplane on a dirt simple 2 layer PCB, REFCLK fanout circuitry and all, with no PCIe bridge IC on there at all, for under $100 in single unit quantities (even at PCB houses in the US).  How's that cost comparison vs individual motherboards per couple GPU's looking now?

So, there you go, the secret to running 16 GPU's per commodity motherboard.  Just in time for GPU mining to have only marginal ROI.  As soon as GPU mining moves beyond the realm of feasibility, you'll see a lot more interesting revelations about GPU mining farms than that..

1.2 Ghash, not 2Ghash !!

Maybe it's just Middlecoin pool pointing is entire pool hash rate to ltc mining ..... they have around 1219.1723 MH/s at the moment

a site where you have to pay before you get paid? i'll take two.

Guys,

Look at this URL: http://www.coingeneration.com/

maybe that big hashrate is coming from users of this site.

Yep, Satoshi is mining LTC now.

Something in the dark 

Too silly for Artforz... Well, may be it's Artforz with Alzheimer

Please... Those PCIe backplanes cost 2-3x more than a motherboard. This is a large amount of hashing power otherwise people wouldn't be discussing it.


Agreed, there's something going on. This isn't something that is a normal GPU level deployment. Anyone else remember the giant BTC botnet that was coming out of Spain last year?

Yep there he is again.

So what you guys are hinting is it may be Artforz?

check give-me-ltc

Check wemineltc, the user seems gone from the lists.

3000+ gpus is not small by any means. and having in fly under the radar is crazy. was there really such a "gpu farm" mining bitcoins - their hashrate should be proportional kh vs mh so you can see who had that much mining power for btc

Interestingly, a lot of people seem to be assuming large, professionally built GPU farms are built the same way as amateur mining rigs, with just a couple GPU's per motherboard.  No.  At that level of investment, they're built significantly differently.  ROI matters, so the inefficient ways amateur miners assemble PC's simply doesn't compute for significant sized GPU farms.

Think more along the lines of one motherboard per rack of GPU's, using custom PCIe bridges and riser boards, and you'll be a little closer to the reality of large, professionally-built GPU farms.  And no, you're probably not going to see photos released of any professionally built and operated farm, until after GPU mining is no longer feasible for any cryptocoin.  Usually you won't even get a camera anywhere near the building (or semi trailers or 40' shipping containers, in some cases), on the rare chance that you get a chance to see one of them.

The farm being discussed here isn't all that large..  There are significantly larger GPU farms both already mining LTC, and still mining BTC that haven't transitioned over yet.

Technically it is like inventing a fission reactor.....not impossible but about 10x as hard for BTC SHA  (it is not going to JUST happen with some dude mining ltc !!)

Whats the most likely conclusion

1) BTC diff has gotten too high and a COmpany/Farm with 500 rigs switched to ltc  ?
2) Some guy/company has developed a technology in complete secrecy & invested 10-30+ million $$ to create this new revolutionary chip
(P.S A guy told a guy that told me on troll box lolz?)


THERE IS NO ASIC FOR SCRYPT so stop perpetuating a lot of bullshit based upon NOTHING !!!  

how is that FUD? if one is actually functional and THAT effecient then it's good news.

LTC in red.

One problem with your logic: There's no way in hell you're going to get 5 MH/s per PC. Even if they're an insanely hardcore gamer, with 4 7970s (or two 7990s) in crossfire, AND he's stupid enough to not notice your malware maxing out his GPUs (a long shot), you'd only get 3MH/s. That kind of person is literally probably one in ten million. Realistically, you'll be lucky to get more than 30kh/s out of each bot, and I am being generous. So, let's see how many bots it'd REALLY take: 1,920,385 / 30 = 64,013 bots. Which is definitely doable, there are botnets in the hundreds of thousands and probably millions of systems. Looking back at your math, I don't even see what you're talking about. The guy is mining with 2M kh/s, not 2M MH/s...