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Zoomhash Selling Votlage Modified 6.2MHS and 7.5MHS Zoom-Blade Scrypt ASICs

Zoomhash, a USA-based company selling Gridseed ASIC miners has began selling voltage modified Gridseed G-Blade miners tho’ they call them Zoom-Blade. The Blade Miners are available ter two versions, a 6.Two MHS (VMOD1) that evidently can run at up to 925 MHz and 170W power usage and a 7.Five MHs (VMOD2) monster that can work up to 1050 MHz with 300W power usage. There is no information about actual improvement ter the power scheme of the voltmodded devices, only about improved cooling, so ter our opinion if you are not very careful ter what environment they are going to be placed you might have some trouble with thesis miners. Overheating and searing up voltage modified G-Blade miners is not that hard to get if you place them ter a sexier environment and the cooling is not sufficient enough to treat the toegevoegd geyser.

Out practice doing a voltage mod of the G-Blade has shown that the miners are able to treat some reserve voltage and be overclocked a bit with good toegevoegd cooling. Pushing them to 1050 MHz however could be more of a problem spil the power block of thesis devices is certainly not designed to treat 150W vanaf PCB, and even with some reserve cooling you could still have problems with high temperature and that could lightly lead to problems with the hardware. So wij advice reserve caution should you determine to go for a voltage modified G-Blade miner, or to modify your own miner. Zoomhash has evidently done tests, but if you place the miner at a place with higher ambient temperature you could still have issues with the zindelijk cooling of the device. So be toegevoegd careful and monitor the voltage modified miners very closely at least the very first 24 hours te order to be sure that they are staying cool and will be able to operate problem free for long time.

  • Te: Mining Hardware
  • Tags: G-Blade, G-Blade voltmod, Gridseed, voltage modified G-Blade, Zoom-Blade, Zoomhash

Thermal Photos of the Voltage Modified Gridseed G-Blade Scrypt ASIC

On the thermal pic above you can see how things look on one of the PCBs of the fresh Gridseed G-Blade Scrypt ASIC te terms of temperature, the GC3355 chips of the device run pretty cool at about 40-50 degrees Celsius. Thesis are the thermal photos of the voltmodded Gridseed G-Blade ASIC that wij have posted about. Do note that the thermal pictures are of the modified device with the extra cooling fever buries linked to it, so the temperature of the voltage regulators is lower and the overall PCB temperature spil well. You can use thesis if you project on doing a voltage modification to your miners te order to see what are the possibly weaker catches sight of – the components that get hot, ter order to improve their cooling and to make sure that you will not overheat and burn your ASIC miner. Wij do recommend extreme caution when voltmodding the G-Blades spil they are already shoved pretty close to their maximum by Gridseed and you do not have a lotsbestemming of headroom for further gaining some reserve spectacle. The power part of the Blade Miners is clearly not designed to treat much increase te the voltage, even tho’ the GC3355 chips are just asking for more spil wij’ve seen with the smaller 5-chip ASIC devices from Gridseed.

Take a look at how hot the PCB gets (around 50 degrees Celsius) near the power connector and that is with about 85W of power consumption vanaf PCB, a clear sign that the connector used is not the flawless choice for powering the G-Blades and while with the stock setup it might be Ok, you should be careful when you voltmod. Do note that wij already have a large motherboard chipset fever submerge fastened to that side of the PCB and it does lower the overall temperature spil well. It is placed on the back side of the PCB where the voltage regulators are and it helps to reduce their temperature, because the airflow from the cooling fan does pass through it spil well and helps to keep it fairly cool.

Looking at the side of the PCB where the voltage regulators are placed, thanks to the fever bury wij have placed directly on the three VRMs their temperature is fairly Ok, but there are other components that might have some issues with fever. Thesis are the gasp on the left of the voltage regulators on the photo and the 16V capacitor below the regulators spil they both get to about 70 degrees Celsius ter terms of temperature. And while they still do seem to work fine te the long run this may cause some issues, so you might consider substituting the capacitor with a more serious one.

Again wij are going to advise you to be very careful should you consider doing a voltage modification to the fresh Gridseed G-Blade miners spil it can be dangerous and you can lightly harm your expensive miner. The modification here is not spil effortless spil just substituting one resistor spil you need to do cooling improvements spil well and you are not able to shove things too much to be on the safe side, so the hashrate increase is also not that big spil compared to what you are getting without the modification. So you might indeed want to reconsider if it is worth doing the modification at all, wij are very likely not going to be modding another G-Blade for a while until wij see how the voltage mod will treat on the longer run te its current state.

  • Te: Mining Hardware|Tests and Reviews
  • Tags: Blade Miner, G-Blade, G-Blade very first impressions, G-Blade mitts on, G-Blade Miner, G-Blade voltage mod, G-Blade voltage modification, G-Blade voltmod, Gridseed, Gridseed Blade Miner, Gridseed G-Blade, Gridseed G-Blade ASIC, Gridseed G-Blade Miner

Voltmodding the Fresh Gridseed G-Blade Scrypt ASIC Miner

Ter the previous postbode with our very first forearms on practice with the fresh G-Blade miners wij have mentioned a bit the topic about voltmodding the fresh Blade Miners. Now is the time to talk a bit more about it and share our practice based on the voltmod experiments wij have already done on our G-Blade. Wij already said that the fresh G-Blade uses the same UPI Semiconductor UP1509 chip for controlling the voltage of the GC3355 chips spil is used on the smaller 5-chip ASICs. So it is effortless to do the voltage modification to the G-Blade spil you are going to be essentially substituting the same resistor, tho’ there is a bit of a difference te how things look on the fresh PCB. There are no factor markings, so make sure you substitute the right resistor marked on the photo above with a green circle with the 333 written on it. The resistor wij are substituting is also a 33 kOhm one (

1.2V default), tho’ here it is 603 type and not 402 like on the 5-chip ASIC devices, so it is lighter to substitute.

Do not be te a hurry to solder a fresh one before reading our advice. Since the default voltage of the GC3355 chips is 1.2V spil on the smaller 5-chip ASIC miners here you can pretty much expect the same out of the opbergruimte spectacle, however our tests have shown about 800 MHz to be the safest option te terms of how high you can go with no or very minimal HW errors, so a bit lower results than what wij are observing on the 5-chip ASICs. Also since the voltage regulators used on the fresh G-Blade are not that much powerful than the ones used ter the 5-chip models you are not going to have the same safe headroom to increase the operating voltage of the chips, ter fact you are actually pretty limited.

Wij were fairly disappointed ter how Gridseed has designed the cooling of the fresh G-Blade miners, and especially the use of a powerful and noisy fan to compensate for the lack of adequate cooling for the three VRMs. The CG3355 chips can lightly be cooled with a silent and much lower RPM fan, however it seems that the powerful fan is there just to be able to ensure that the mosfets are kept cooler without having any radiators directly placed on them or on the back of the PCB where they are located. Wij are getting about 60 degrees temperatures of the IR mosfets at the standard voltage and operating frequency of 800 MHz, however spil soon spil wij liquidate the fan the temperature of the VRMs starts to get higher very quickly while the CG3355 chips still remain pretty cool. By substituting the resistor marked above with a higher value one and enlargening the operating voltage of the chips you can lightly overcharge the voltage regulators and burn them te a matter of just a 2nd without the fan and even with the fan running you can still burn them if they get too hot. So the uur you determine to voltmod the fresh Gridseed G-Blade you need to also think of improving the cooling of the voltage regulators a loterijlot and not attempt to shove the operating voltage of the chips too much, or you risk the VRMs lightly overheating and searing up. Wij have used an old motherboard chipset radiator glued on the back of the PCB (with thermal glue) where the voltage regulators are placed, so that it can help ter keeping them cool and have also placed a smaller movie memory cooler directly on top of the regulators on the other side of the PCB.

Wij have leisurely commenced enlargening the operating voltage of the chips from the standard value of about 1.2V until wij have reached 1.4V with the use of a 39 kOhm resistor and determined to zekering there spil wij’ve already seen the voltage regulators getting fairly hot. At this point wij were aiming at a stable operating frequency of about 1000 MHz while keeping the device cooler and being on the safe side for the voltage regulators. With the 39 kOhm resistor substituting the standard 33 kOhm one wij already eyed the mosfets lightly getting up to 90-100 degrees Celsius te about a minute (without the reserve cooling). With our reserve Two radiators fastened to the PCB and the chips wij were able to bring the temperature below 70-75 degrees on the long run, so pretty much safe for leaving the miners run all the time like that, tho’ you should proceed to cautiously monitor the temperatures. Wij have determined to stay at 39 kOhm, tho’ pushing a bit more for like 40-41-42 kOhm with toegevoegd cooling might work, going for 47 or 49 kOhm may be a bit too much for the VRMs to treat. So be toegevoegd careful should you determine to go higher sunburn what wij have used, tho’ wij do not recommend it, and monitor cautiously the temperature of the voltage regulators spil they may get very hot ter no time and burn up without adequate cooling!

Here is what wij are getting after substituting the resistor from the standard value of 33 kOhm to a 39 kOhm one. Running the device (only one of the PCBs is connected on the photo) at 1000 MHz seemed fairly Ok with little HW errors, tho’ wij have determined to go a step lower te order to lower the HW errors a bit more. After some extra testing wij have lodged for 988 MHz spil it brings down the HW errors up to something about 1-2 vanaf hour which is much more acceptable than getting an error about every minute or so at 1000 MHz. The local hashrate at 988 MHz wij are getting vanaf PCB is close to Trio.Four MHS or almost 6.8 MHS total for the entire miner with the Two PCBs modified, up from about Two.6-2.8 MHS vanaf houtvezelplaat or about Five.2-5.6 MHS without the mod and the miner running at 800 MHz. The power usage vanaf PCB after the voltage modification is about 85W or a total power consumption of about 170W for the entire modified miner.

The results wij are getting are not bad, but do require you not only to solder a resistor, but also to improve cooling of the device. You also need to be toegevoegd careful should you determine do go even higher than what wij have achieved spil the voltage regulators might not be able to treat well the extra geyser or the temperature. It seems that with the G-Blades things were already shoved close to their boundaries by Gridseed, so there is not that much of headroom left for users to squeeze some toegevoegd vertoning for free by voltmodding the units. Wij are a bit disappointed by that, wij kleintje of expected more, especially after eyeing what the GC3355 chips were capable of ter the smaller 5-chip devices. Wij are going to be doing some more tests and experiments te the next few days to see if wij can get something better than what wij are already getting, but the chances for some significant improvement are not that good.

Again wij advise anyone willing to do a voltage modification to his Gridseed G-Blade ASIC miner to be toegevoegd careful spil thesis devices are more expensive and can treat less manhandle from the users spil compared to the smaller 5-chip ASIC miners, so proceed with caution! The smaller 5-chip miners permitted more headroom spil they were designed to treat much higher power usage because of the BTC mining part, but for the fresh G-Blade miners Gridseed has determined not to support the SHA-256 mining part (the chips do, but the device cannot supply enough power, so do not attempt to activate BTC mining or your miner may burn). So the headroom for overclocking without doing some modification related to the voltage regulators is actually very little with the fresh G-Blade ASIC devices, and working only on improving their cooling does help only a bit. Reworking the power part of the miner could open up some extra possibilities, but that is not something that most users can lightly do themselves unlike the replacement of a single resistor for example. Ter brief, if you are expecting vertoning boost on the fatter G-Blades like on the smaller 5-chip devices with a voltmod, you will be very disappointed, and the fact that after voltmodding the Blade Miner you might have trouble cooling it down decently for long term operation might not be worth the reserve vertoning boost you will get.

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