• Sagar Acharjee

Using Low Hash Rate GPU In Dual Setup

The vast majority of 3000 series graphics cards purchased in the last few months are low hash rate (LHR) graphics cards. As a result of this reduction, the mining performance of these cards has been reduced by roughly 50%. The mining industry, on the other hand, has been hard at work devising ways to get around these restrictions since they were enacted. The most recent versions of NBMiner and T-Rex have increased the performance of LHR cards by up to 70%, and T-Rex now allows users to mine Ethereum and another coin simultaneously with the same hardware. A clever way to maximise the performance of an LHR card is to mine two coins at the same time with a slight performance hit. I'll go over the different options for mining with an LHR card in this section, as well as how to get the most out of your card's performance.

What Are The Benefits Of LHR Cards?

Nvidia's 3000 series graphics cards have proven to be extremely difficult to come by in working condition since their introduction last year. Finding a 3000 series graphics card is becoming increasingly difficult even now, more than a year after their initial release. Many people believe that the 3000 series GPUs are the result of our ongoing silicon shortage; however, for the majority of their existence, they have been produced at a faster rate than previous Nvidia cards. Nvidia has stated several times that unprecedented demand is the reason you won't be able to buy a new GPU until 2021. While these cards are in high demand for a variety of reasons, one of the most important is unquestionably their cryptocurrency mining profitability.

Ethereum mining has been extremely profitable since the beginning of 2021, and it has remained profitable despite EIP-1559's changes to the fee structure. Because mining is so profitable, there's no reason why people with extra cash shouldn't invest in graphics processing units (GPUs) for it. After all, the more graphics cards a person has at his or her disposal, the more lucrative mining becomes. Graphics cards, on the other hand, aren't made specifically for mining cryptocurrencies. Content creators and gamers alike are in high demand for these high-performance graphics cards, and Nvidia has come under fire from gamers for allowing miners to buy every available card from online retailers using bots. Nvidia began incorporating a hash limiter into their GPUs with the release of the 3060 in order to combat the phenomenon of every GPU they produce being immediately purchased and installed in a mining setup. The letters LHR, which stand for Low Hash Rate, are usually found in the SKU of these cards. An LHR card has a software lock on the Ethash algorithm that reduces performance by about half when using the card.

Why not mine different coins instead?

It was initially discouraging to learn that a new 3080Ti is only capable of 57 MH/s on the Ethash algorithm, whereas my non-LHR 3080 is capable of exceeding 90 MH/s. Given that the 3080Ti is significantly more expensive than the 3080, this represents a significant reduction in Ethereum mining potential. As a result of this reduction, many LHR card owners are mining alternative coins that use a different algorithm, such as Ravencoin, Ergo, or Conflux. These three coins mine using their own algorithms rather than Ethash, so LHR cards can mine them without sacrificing performance. While mining these coins is not as profitable as mining Ethereum, it is still significantly more profitable than mining Ethereum at half the speed. Mining an alternative coin, on the other hand, has some drawbacks. The amount of money that can be made from mining a cryptocurrency is directly proportional to its value. One of the factors that makes Ethereum so promising for mining is the fact that its value is rising. Furthermore, Ethereum is relatively stable when compared to other alternative coins. Every coin, no matter how insignificant, has the potential to lose a significant amount of value before a miner can sell what they have worked so hard to earn. Many cryptocurrency enthusiasts are also optimistic about Ethereum's future value, and many small miners have simply kept their mined coins as a cryptocurrency investment. The chances of liquidating other coins as quickly as possible to secure the profit are much higher. In this case, mining a coin like Ergo isn't a bad idea, but it's less appealing than Ethereum mining, and it still yields a lower profit than if we could mine Ethereum at full speed.

Dual Mining as a Concept

The first step is to install the second GPU using a Riser, as shown in the image. While there is currently no way to completely remove the Ethash algorithm's limiter, dual mining now provides a way to earn roughly the same raw profit, which is a significant improvement. Miners can now fully utilise the mining potential of LHR graphics cards with at least 8GB of VRAM by mining both ETH and an altcoin at the same time with T-Rex 0.24.0, allowing them to realise their full mining potential. Mining two coins at the same time will generate more revenue than mining one alternative coin alone. Furthermore, it means that miners can continue to accumulate Ethereum, which is widely regarded as a better and more stable investment than the alternatives. The main disadvantage of dual mining is that you will accumulate both coins more slowly than if you dedicated your entire GPU to one coin; however, if you are willing to accept less frequent payouts, this will not be a significant disadvantage. I'll compare each combination using an LHR 3080Ti as the test card, as shown below. It's worth noting that the VRAM requirements for each combination are different, which I'll go over in more detail in the following sections. More VRAM is required because the GPU must be able to store two complete datasets, referred to as DAGs.

ETH and ERGO are two terms that are often used interchangeably.

The only method that can be done on Windows with 8GB of VRAM is the combination of ETH and ERGO, so users of the LHR 3070Ti on Windows will have to use it. It's also worth noting that the hash rate limiter can affect ERGO mining performance; however, most LHR GPUs won't suffer any performance degradation even after minor overclocking tweaks. Before moving on to dual mining, it is recommended that you first try mining ERGO alone to dial in the proper overclock. We can achieve a hash rate of 35 million bits per second (MH/s) for ETH and 180 million bits per second for BTC using a 3080Ti (ERGO). Before the cost of electricity, this generates a revenue of $7.20. After accounting for my local electricity costs, this yields a profit of about $6.40. Due to the high profitability of ERGO at the time of writing, this is the most profitable combination at the time of writing. At the time of writing, dual mining ERGO and ETH on an LHR 3080Ti earns more raw profit than mining Ethereum alone on a non-LHR 3080, demonstrating that this workaround is effective at bypassing the limiter.


On Windows, dual-mining Ravencoin and Ethereum necessitates at least 10GB of VRAM, while on Linux, it necessitates at least 8GB. When used in conjunction with a mining rig, the 3080Ti provides a hash rate of 35 MH/s for ETH and 29 MH/s for Ravencoin. When my local electricity costs are factored in, this combination generates approximately $6.24 in revenue or $5.19 in profit. Ravencoin hasn't been my favourite alternative coin to mine in a long time. In terms of profitability, Ergo has only recently surpassed it, and it's possible that they'll continue to trade the top spot for a while.

ETH and CFX are two different types of cryptocurrency.

The only combination that requires 10GB of VRAM on Windows and Linux is Ethereum and Conflux, which means that owners of the 3070Ti GPU will be unable to use this combination regardless of operating system. For ETH and CFX, the same 3080Ti that was used in the previous example achieves hash rates of 36 MH/s and 60 MH/s, respectively. This combination of goods and services generates $5.92 in revenue and $4.97 in profit. Unless you have a specific reason for wanting to mine Conflux in the first place, I would recommend one of the other two options.

Putting Together A Dual-Mining Setup

You may be wondering if setting up dual mining is difficult, and I can assure you that it is not! When we use T-Rex to mine something, we give it the algorithm we want it to use as well as information about the pool of our choice. Putting Together A Dual-Mining Setup You may be wondering if setting up dual mining is difficult, and I can assure you that it is not! When we use T-Rex to mine something, we give it the algorithm we want it to use as well as information about the pool of our choice. T-Rex is instructed to use autolykos2 as our "lhr-algo," which is Ergo's algorithm. Then, for both coins, we pass it the information about our coin pools. You'll find.bat files that contain complete examples of each type of dual mining combination available when you download the most recent version of T-Rex. Overclocking Nvidia's 3000 series GPUs are extremely capable of overclocking, and many of them will noticeably improve performance when the VRAM is overclocked. Personal preference: I overclock my cards' memory while lowering their power consumption, resulting in lower core clocks. Because mining relies heavily on your GPU's memory, which is constantly reading random slices of the DAG and hashing them together, increasing the speed of your GPU can significantly improve performance.

The DAG is a dataset that is updated every 100 hours or so, and it needs to be loaded into your GPU's memory before you can start mining with it. The DAG is constantly growing in size, which is why graphics cards with less than 3GB of VRAM can no longer mine Ethereum. The 3080Ti was run at 82 percent of its maximum power throughout all of these tests, with a memory overclock of +1000. Because core overclocks tend to increase the amount of heat generated while not increasing mining performance, no core overclock was used. In order to reduce heat even more, I frequently set my power limit to closer to 75% of its maximum capacity. I like to set my fan speed and overclock settings to achieve the temperature I want because it is best for the GPU to have the fans running at less than 70% of their maximum speed to reduce wear.

Maintain Consistent Temperatures

The Nvidia 3070Ti, 3080, and 3090 all come with brand new Micron GDDR6X memory, which is extremely fast and contributes to their superior mining capabilities. As evidenced by the fact that this memory runs extremely hot, it appears that some manufacturers used suboptimal thermal pads to move the heat away from the card. The memory temperature is displayed next to the core temperature every time T-Rex updates the command prompt, as shown in the screenshot. 95 degrees Celsius is the maximum temperature for GDDR6X memory, which is considered ideal. This can be reduced by cooling the room, increasing the fan speed, or lowering the memory overclock. If the temperature of your GPU consistently exceeds 100 degrees, I recommend replacing the thermal pads on your GPU, as I did with mine. While I understand why low hash rate cards were developed, I believe that those who own them should be able to profit from profitable mining while it is still possible. Even with a low hash rate card, dual mining is the most profitable method of mining cryptocurrency at the moment. Despite its drawbacks, such as less frequent payouts, I strongly advise mining Ethereum alongside your alternative coin.