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I think he did pay some users.
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Thanks god we have you Randy
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This guy fucked over more than one person, mining for him. Stay away !
*citation needed There is no BS needed. If more than 5 different people complain about being not paid, that's enough for me to warn others. This guy should have been sticking to solo mining  |
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This guy fucked over more than one person, mining for him. Stay away !
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Nice little tower  |
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Sounds like a fair deal to me. 6770 should do about 200 MH/s. And power usage should be better than a 4850. Win for you ! |
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That's what you get if you mine for 120%... |
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Yeah i know from IRC that he uses GPUMAX from time to time. I have no problem with that  |
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What is Fefox doing over there?  He gpu maxed us !  |
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Actually, on second thought, you may be right. During one of the "downclock of death" episodes I encountered, it went as low as 126 MHz before I stopped it. Thus, I now think you're right - it simply stabilized at 174 MHz, worked at 174 MHz for a while, before the microcontroller crashed.
Thats correct. I had several DCODs with my 1.15d and the controller never crashed ! Apples and oranges. DCOD...caused by the Bitstream not doing something 100% right when programming the DCM (digital clock manager) on the FPGA, turning DCM programming into something like a lottery. Cypress controller crash...believed to be caused excessive conducted and/or radiated heat from a PASSIVELY cooled FPGA. I never had a DCOD because of something else than passive or bad cooling, ever. But you are right that the layout of the boards is different. |
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Actually, on second thought, you may be right. During one of the "downclock of death" episodes I encountered, it went as low as 126 MHz before I stopped it. Thus, I now think you're right - it simply stabilized at 174 MHz, worked at 174 MHz for a while, before the microcontroller crashed.
Thats correct. I had several DCODs with my 1.15d and the controller never crashed ! |
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From the thread it appears that I'm going to need to ensure that my PSU doesn't kill the boards - it's a switching supply for CCTV units, rated at 12V DC - sadly I only have a decent multimeter and no oscilloscope, but Stefan said 'if it's switching, it's regulated' and I'll be testing with one board first anyway. I think a multimeter should be good enough to check. I run my x's @ 12V and the d's at 13.8V. |
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I didn't pull the heatsink ! That much i know. When i removed the pad the first time i could see that it did not made enough contact with the chip. The heatsink is perfectly flat. The latest fail could be too much of thermal adhesive. I tried to put on as little as possible. Either way, i had my chances. Now there is no way to remove the heatsink without serious damage.
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Heatsink placement is a bitch.
Heat sink installation on USB FPGA Modules 1.15d should not be difficult if you follow the instructions at http://www.ztex.de/usb-fpga-1/usb-fpga-1.15.e.html#hs. Only two additional things have to be considered (in comparison to the 1.15x board): - Heat sink removal is critical. Always unmount it by twisting (see http://www.ztex.de/usb-fpga-1/usb-fpga-1.15.e.html#hs ) tilting may damage the PCB (IMHO that happened to Turbors board)
- Some airflow has to be ensured, either by case fans or by using the active cooling upgrade in the shop
The board is working fine. It just needs some pressure from above. I can live with that  It's the faster board of the two btw... |
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From what Stefan said, under 30C the speed is not really affected by thermals.
Yes, it's 4 MHz more or less for some boards. At 16 degree they do 220 and 216 for example and at 21 degree they clock down to 216 and 212. But i prefer a lower clock rate with less errors ! |
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Well I've finally bitten the bullet, and ordered a single 1.15d with 'experimental board' (i.e. power supply rig) for my first intended 5-board frame design. And hopefully, as the GPU / logic board / PSU / RAM / drive systems are sold off, I'll be able to afford to buy more ZTEX FPGAs. I haven't gone for the 1.15x models for two reasons. Firstly is the availability, but secondly, the 1.15x board is very specific to particular applications, and with the power regulation hardware on-board, requires better cooling. The 1.15d needs to be plugged into a separate board underneath - I'm hoping that my experience with 12-GPU frame rigs will allow me to build a 5-board 'tube' with a couple of PC fans at each end, using the standard heatsinks. Forced air, enclosed by perspex so the cool circuit boards can be shown off :-) Firstly a BIG shout out to Stefan for supplying and delivering my FPGA, experimental board and cabling within a day... he sent it on the Thursday evening from Germany and I picked it up in England by lunch-time on Friday. That's impressive stuff. The kit looks nicely built - it doesn't look like I can make any use of the microSDHC card slot built onto the 1.15d, sadly, because the FPGA is too close to the card slot and the heatsink required will block any use of the card slot. OK, it'll have to be programmed via USB - not the end of the world... Stefan - if you're reading this - yes I wanted immediate delivery and you're probably wondering why I haven't got the unit up and running yet... well, the software is only supplied for Windows (hurl) and Linux. My main machines all run Mac OS X - so I've downloaded the source to your SDK and dependencies and trying to port to OS X. It shouldn't be a problem at all, unless the only way of loading the bitstream to the FPGA is to use the binary Java distributions you have for download (Windoze and Linux only). I don't want to have to buy the expensive FPGA SDK, for obvious reasons. However, all your free tools *ought* to compile under Mac OS X - at least on Intel powered Macs. Will let you know if I hit any roadblocks... Other than that, superb customer service, and blunt but accurate advice about what kit I needed to buy. I'm not an electronics engineer, and my questions could have got Stefan treating me like the guy who fried his voltage regulators. But he was polite and responded to my noob questions quickly. Looks financially like I'll get the first FPGA board going, then build a funky perspex case, sadly only be able to afford another single unit at the end of the month (i.e. full price  ) - but when I can release the capital to buy in bulk then I'll be trying to take advantage of the significant volume discounts. With English electricity costs, and only so much winter left to take advantage of (no gas central heating switched on this year!), I really need to switch from thirsty GPU rigs (9 Ghash worth... expensive power bills) to FPGAs. Hopefully mine will be one of the 'good chips' and run over 200 Mhash using vertical air cooling... without spending more of my power budget on fans than actual hashing power! (just one of my frame rigs uses 60W worth of mains-powered fans... imagine all of those watts pumped into FPGAs....)  And cheeers Stefan, fantastic customer service and the kit looks top quality. Will ensure that I use a reasonably decent power source for the boards though.... The 1.15d should get you 208 to 212 MHz with good cooling. I cool mine with a 120mm fan from above and a 92mm from the side. At 21 degree C the boards run 208 MHz at almost zero % error rate. Heatsink placement is a bitch. I have one board that i can only use with a clamp, holding down the heatsink (and that with arctic alumina adhesive...   ). If you use the pads, i would use a clamp for some time to be sure the heatsink sticks to the chip. 1.15x boards run a bit faster due to their bigger heatsink. And yes, the boards are heavy duty. I ripped off the heatsink countless times just to find out that it won't work without clamp. Very good quality. |
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Found out that downclocking my cards has a positive effect on stales (rejects) with cgminer 2.2.5. Also lowered intensity. I can see a nice increase in p2pools local hashspeed . Never had a HW reject or extreme clocks. Just funny to see. |
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It was succesfull, but backfired on me, and was a loss, Im still thinking of ways to use this.. There is only one winner...  |
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