Some of you might remember our guide from last year on How to Maintain and Repair Dual-X and Other Non-Serviceable GPU Fans covering the whole procedure on how you can fix the fans of old mining video cards that use cheaper sleeve bearing fans. That guide was demonstrating the whole procedure for Sapphire’s old Radeon Dual-X video cards that were very popular back in the Litecoin mining days and are still usable for mining ZEC for example or any other Equihash-based altcoin. Back then we mentioned that the same procedure works for Gigabyte’s Windforce fans as well as many other cheaper fans that find their way on a lot of video cards nowadays, even on very high-end products such as even GTX 1080 Ti. The basic procedure fro replacing the metal bushing with ball bearings is pretty much the same on all fans, though there are some specifics from brand to brand and from model to model and now it is time to talk a bit more about Gigabyte’s Windforce fans.

Gigabyte has been using the Winforce series of fans for quite some time and they have never been our favorites, especially for GPU mining rigs due to the fact that they are essentially cheap sleeve bearing fans that are less durable when used in higher temperature and dusty environment. The high temperature and dust are the two very common things for many GPU mining rigs and Gigabyte even used the same fans on their Nvidia P106-based mining GPU and we have recently checked what is the situation in just a bit short of three months of use for mining with these. We even had bad experience with Windforce fans starting to fail in just about a month of use on RX 400/500 series of GPUs as well as on GTX 1070 when used for mining, so you can imagine why video cards from Gigabyte with these fans are really not our first choice for GPU mining rigs.

With all of the above said however there is one important advantage that Gigabyte’s Windforce fans have over some other cheaper sleeve bearing fans found on expensive video cards used for mining and that is the fact that you can relatively easily upgrade them. We are talking about replacing the metal bushing with dual ball bearings thus fixing fans that are starting to show signs of the metal bushing wearing off and the fan destabilizing or the fan rotating slower due to dust buildup. The important thing here is to catch the potential problem on time and fix it promptly and not wait for the fan to stop rotating completely and then start to think about a solution as then it will be most likely too late to do anything. Sure, with fans starting to fail in a month or just a couple of months since purchase of a new GPU you can get a warranty replacement, but when used for mining this means downtime and the newly replaced card can start showing problems soon as well… imagine if you have tens or hundreds of Gigabyte Windforce, Gigabyte Gaming and even some Gigabyte Aorus cards that do come equipped with the cheap sleeve bearing Windforce fans.

The metal bushing used by the Gigabyte Windforce fans is 2x5x5.5mm in size (2mm inside diameter, 5mm outside diameter and 5.5mm height) and you can easily find the right size of ball bearings for these sizes. You will need two 2x5x2.5mm bearings as well as a single spacer with at least 2mm inside diameter and 5mm outside that has a thickness of 0.3-0.5mm that you need to place between the two bearings. If you do that you will get a perfect replacement of the standard metal bushing essentially upgrading the fan to dual ball bearing one and getting it to be like a brand new one or even better. The dual ball bearing upgrade will make it more durable and resistant do higher operating temperatures and dust and you will have more problem free time for mining without issues with the fans. The only drawback is that the upgrade procedure can or will void your warranty, unless of course you do the procedure carefully and save the metal bushings to reinsert them back should you need to return the video card for replacement due to an issue with the board itself and not the fans.

The latest AMD Radeon Software Crimson ReLive Edition 17.10.2 drives come with some interesting new features not only for games, but for compute use (including mining). The two of the interesting highlights regarding mining use are the GPU Workload option as well as up to 12 GPU Compute Support (only for Windows 10). This may open up more options to users using Windows 10 for mining rigs with more than 8 GPUs, at least if they are using AMD-based video cards and maybe soon we are going to see similar feature also provided by Nvidia as apparently the video drivers are capable of driving more than 8 GPUs under Windows 10 as AMD is showing.

GPU Workload
A new toggle in Radeon Settings that can be found under the “Gaming”, “Global Settings” options. This toggle will allow you to switch optimization between graphics or compute workloads on select Radeon RX 500 and Radeon RX 400 series graphics products.

Compute Support
Radeon Software now supports compute workloads for up to 12 installed Radeon RX 400, Radeon RX 500 or Radeon RX Vega series graphics products on Windows 10 system configurations.

It is not yet clear if there will be some performance improvement when using the compute workloads option as opposed to the gaming option, this will need to be tested. The up to 12 GPUs support for Radeon RX series of GPUs under Windows 10 is much more interesting for the miners that are already building mining rigs with motherboards supporting 12 or more GPUs. Do note that this feature apparently supports only AMD Radeon RX series of GPUs and not older models, but it also seems that the up to 4 VEGA GPUs limitation should also not be a problem anymore. Again this of course needs testing for a confirmation, so if you check any of these new features in the latest AMD video drivers feel free to report your results in the comments below.

Do note that according to AMD GPU Workload feature may cause a system hang when switching to Compute while AMD CrossFire is active, not that you would need to have Crossfire enabled at all for mining, but just be sure that it is disabled if your motherboard supports that. The Radeon Wattman should also give you less trouble when overclocking/underclocking the GPU, though probably not everything is fully resolved.

Update: It seems like AMD might have messed the performance with this new driver for RX 400 and RX 500 series of GPUs compared to what you are getting with the old Blockchain driver. So do not be in a hurry to update to this driver with 400/500 series if you are mining Ethereum or other Ethash-based altcoin as your mining performance may drop instead of increase! We are still yet to test the situation with VEGA GPUs, hopefully there things should be better…

For more details and to download and try the latest AMD Radeon Drivers 17.10.2…

Here is a ccMiner fork based on alexis78 code, but with added support for the KeccakC algorightm (source) used for CreativeCoin (CREA) mining. KeccakC is a slightly different variation of the Keccak algorithm, but it still requires modified miner to support it, so you still need to use a compatible miner for coins like CREA that use it. If you are looking for an sgminer with KeccakC support check this Windows binary from the official project website (source).

We have compiled a 32-bit Windows binary of the ccMiner frok from cornz with KeccakC support as it was requested by readers and you can download and try it from the link below. It is compiled with Visual Studio 2013 and CUDA 7.5, the supported Nvidia GPUs are Maxwell or Pascal-based ones (Compute 5.0 or newer). The performance we are seeing is similar to that of the original Keccak algorithm, so you can expect to see similar performance if you have mined a Keccak-based coin recently. Again, have in mind that Keccak and KeccakC although similar are not compatible with each other and you need to use the respective algorithm for the coins that use it!

To download and try the ccMiner 32-bit Windows binary with KeccakC algorithm supported…

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