To be fair, I didn´t do any exact thermal measurments (or exact GH measurements) on my DCDCs, so it could possibly have worked at that GH without the additional heatsinks.

I just had them lying around and thought additional heatsinks couldn´t possibly lower the hashrates, so I attached them.

I was also thinking about maybe reapplying thermal paste, but without access to my webinterface I couldn´t even say whether that lowered temps.

When I open the unit the next time I can take some pics.

when do they expire? expiration date is useful to know since it will give an indication when they will be available again for batch 4.

I predict there will be a big drop in price for batch 5, the reason is simple for batch 4 there are a lot of coupons for the people that did not want the refund which reduces the need for price reduction beyond the 7.7% for drop hash rate, and another 9% for difficulty increase, but as expected they will sell out quickly, for batch 5  all the coupons will be gone, and further increases in difficulty will force them to drop the price further, and by then mostly everyone that wanted one will have at least one, once they start selling from stock is when prices will be the lowest, just like it happened with the S1, history repeats. currently the s3 is the best deal for the money that I am aware of.

for me, validity time:

2014-07-12 00:00:00~2014-08-16 00:00:00

What do you recommend me guys then if i plan to run 2 S3 at 212,50 Frequency(~424,81 GH/s? - 362W each, 724 W total). Use 1 corsair CX750W for 2 S3 with that frequency(212,50 - 362 W), or 1 corsair for each S3, and buy i dont know a 1000W new PSU for 2 more S3.

thanks

I recommend the antec hcp1300 platinum it is very good and has 16ga cables, a total of 10 pci-e connectors.
I have used it with 3 s1, and now using it with 2 s3, it can easily handle 3 s3.

another really good power supply is the xfx 1250 gold, that could easily handle 3 s3  but unlike the antec it only has 8 pci-e connectors, however you would have to use a single pci-e connector for most blades, and it cost a little less than the antec.

Both antec and xfx I have used them in the past under an extreme environment with great success.

Thanks both. i will check prizes. im from madrid, spain, and prizes here in europe change and i cant buy many products from USA because they dont deliver here.

I will buy coupons for the S3 as soon as they become available.

Ok thanks so much. Time  to check prizes now

do i need a psu? what do i use to control it?

I really wish Bitmain would make a post about Batch 4 and the reported issues we've had with the first three batches.

Not sure if I should take the refund or coupon. Performance is less than 7.7% difference on some units, it appears ~33.33% (3 repeating, of course...) of the units exhibit performance below the stated 441GH/s, and the random beeping... OH THE BEEPING... WHY GOD, WHY !?!???