Re: DIY FPGA Mining rig for any algorithm with fast ROI

The Keccak-24core/708MHz (17GH/s) bitstream burns 306A and will run on an unmodified VCU1525 for approximately 10 seconds. To run it continuously requires extensive modifications as described here:
http://zetheron.com/index.php/hardware-modifications/

That right there is a complete show stopper, IMO, and a very strong indication that this particular product is unfit for purpose. This kind of an issue on a product with a price tag in the $4K range is unforgivable.

GPU manufacturers can keep a 2-slot card going flat out at 300W with their active cooling solutions. If VCU1525 cannot do the same with 150W power limit (1x 6-pin + PCIe at max 75W each), that indicates a very poor design. I am very glad I waited for initial feedback before I ordered mine, and in light of this I won't be ordering these at all.

Has anybody got a line on pricing and availability of the mentioned Bittware VU9P card that will be fit for purpose out of the box?

He's drawing almost double the rated power. That's why it shuts down. It would be like using 600 watts overclocking a gpu.

It's 1x 8-pin + PCIe (225W total). The big problem is that the core is only rated for 160A (136W -- But he's shown that it definitely can handle more).

The bigger issue is cooling which is not so difficult.

Right, so what is the expected performance like at 225W power limit?

It depends on the design, whitefire's designs are far more optimized than mine for those specific algo's.

@whitefire990 Could you reduce core clock to a more reasonable number and provide some feedback? I'm not sure everyone is going to want to run their card at those junction temps. Keep in mind, even with cooling modifications, At those thermal envelopes, someone running their card in an environment 5F warmer than you, even with the same cooling, may have problems.

17GH @ 306A would imply ~8-9GH @ 160A.
That doubles the ROI time.

Ya, the same can be said for a CPU or GPU. But if you need liquid nitrogen to keep it cool, it's probably not sustainable either.