Quote from: cepo on December 16, 2013, 03:29:06 PM

Hello,

can someone tell me how much Watts the NEPTUNE uses or is prefered?

Thanks.

cepoo

That information is not yet known. KnC will not give us details until they know for themselves, which is at least a couple months from now.

There is, however, speculation based on the "30% reduction in watts per GH" claim made on the Neptune product page. It's unclear if the 30% reduction is based solely on the chip's requirements or the entire device. I'd guess that the 30% number is somehow derived directly from TSMC's own info about their 20nm tech, which KnC is using.

Since My October Jupiter pulls ~1.2 watts per GH at the wall (measured with Kill A Watt), but only ~0.99 watts per GH measured at the VRM/chip level (using Bertmod), one could extrapolate that ~82.5% of the power is used by the chip itself and the rest is overhead in the PSU, fans, and other components. Given a 30% power reduction for the chip, one could assume ~0.69 watts per GH at the VRM/chip level for the Neptune. If the Neptune hashes at 3,000 GH/s, then it will require at least a 2070 watts for the VRMs/chip alone. If the Neptune is like the Jupiter in terms of overhead, then 2070 watts represents 82.5% of the total power needed at the wall. This leads us to a total requirement of ~2500 watts.

Now, DON'T GO BUY ANYTHING YET. KnC is known for delivering products that seriously outperform their original estimates. The Neptune could turn out to hash at 4TH for all we know (please don't expect this, it's unwise). If this is the case, then you can be sure the power requirements will be even higher. It's also possible that there's more than a 30% power reduction too, so keep that in mind.

So, this leads to the obvious question: "What power supply do I need!?". Nobody knows yet, but I'm betting (hoping) that KnC decides to use server-class power supplies instead of standard PC (ATX) power supplies. We won't know for quite a while though.