PENCIL MOD +. Heatsink removed, swapped for a CPU hsf unit. measured at @ 29deg C
R15 = 0.85 (measured at 20k)
HW's = 9.89%
2.732GH/s (5s avg)
You happen to have a picture of this you can post>?
Also removing the heat sink, its just on there with some sticky tape and you pried it off?
I used a snap-off craft knife (for blade lengths) and slid it down the HEATSINK side of the thermal tape, it came away very easily once you broke the initial adhesion. The tape is surprisingly thick so you could safely get a knife down the middle and never even touch the heatsink or the board. I'll edit this post and include my pictures of the HSF mod later tonight.
My experience is that the temperature went from 42deg at heat sink without a fan to about 80deg at heatsink. I would recommend that you DONT pencil mod without increasing the cooling from the stock setup or it's likely you'll dramatically shorten the lifespan.
*** EDIT ***
For those who are interested, this is my CPU HSF mod.
Stock heatsink removed. CPU Heatsink applied with thermal compound. Fixed with screws through PCB fixing holes, between fins of HSF unit to hold securely (but not over tight). Cut yellow and black wires to HSF 4pin connector. Strip these wire ends. Strip a USB micro cable. Safely cap the data wires. Connect the yellow and black HSF wires to the USB 5V power lines, and tape/shrink-tube safely. You now have a usb powered, extraordinarily efficient heat sink fan that runs nearly silently, plug this mutant creation into a usb extension lead, and same with the miner and away you go. The HSF is designed for up 12v feed from the motherboard to run at full speed, so it works fine with usb's 5v, just not as fast as normal, which has the pleasing side effect of being very quiet. Yellow insulation tape was my temporary low-tech way of lowering the brightness of the LED temporarily, it serves no other functional purpose.