Quote from: Raize on April 06, 2012, 01:47:46 AM

Quote from: matthewh3 on April 05, 2012, 11:47:48 PM

The board should take 16 months to pay off at today difficulty and exchange rates leaving eight months within warranty of guaranteed profit. The BFL-Single would take over eight months to pay off but with only six months warranty. Do the maths

Bitforce single:
830 megahash/second
80 watt
Heatsink + Fan
Comes with everything included: USB cable, Power adapter
Price: $599 + $34 shipping = $633

Icarus miner: (discontinued)
380 megahash/second
20 watt
Heatsink + Fan
Comes with everything included: USB cable, Power adapter
Price: $569 + $25 shipping = $594

x6500:
400 megahash/second
17.2 watt
No Heatsink/No Fan
Comes with no Power adapter or USB cable
Price: $550 + $7.90 mandatory insurance + $5.50 shipping + $17.95 AC Adapter + $8.95 USB cable + ($20 Two Zalman FPGA heatsinks + $4.54 shipping) + ($2.49 90mm case fan + $6.29 shipping) = $623.62

Sources:
http://www.amazon.com/Zalman-ZM-NBF47-Northbridge-Flower-Heatsink/dp/B000ZSBVK0
http://www.amazon.com/90mm-Case-3-Pin-Connector-Black/dp/B004OFXXX8/ref=sr_1_2?s=electronics&ie=UTF8&qid=1333676747&sr=1-2

Did I do my "maths" right?

Actually, the X6500 is $565 without heatsinks, and $580 with heatsinks, which include fans.

The point of selling the X6500 as a bare bones unit is to make it as flexible as possible for people that want to figure out their own cooling and powering solution. This is especially important when buying multiple boards. Here's my own math, for two theoretical customers:

Single board customer:

X6500 with heatsinks (ordered from Cablesaurus.com):
$580 + $7.90 mandatory insurance + $5.50 shipping = $593.40

AC adapter:
taken from an old router = $0

USB cable:
who doesn't have millions of these? = $0

Total = $593.40

Multi-board customer:

10x X6500 with heatsinks (ordered directly from FPGA Mining LLC):
$550 x10 + $60 shipping = $5540

380W ATX PSU:
$45 + $4 shipping = $49

10-port USB hub:
$11 + $3 shipping = $14

10x USB cables:
$2.32 x10 = $23

Total = $5626 or $562.60 per board