An event that was eagerly awaited in the camp of “red” miners – AMD held a presentation of its RDNA 2 graphics adapters: Radeon RX 6800, RX 6800 XT.
The innovative solution of the AdvancedMicroDevices team has been appreciated by computer enthusiasts. The red cards of the latest series in games showed higher performance than the RTX 30 based on the Ampere architecture and at the same time they will be sold at a lower price.
For seven long years, flagship green graphics cards dominated the market, but now AMD has managed to get ahead. Optimists believed that there was no need to rush to build mining farms based on the RTX 3080 or RX 5700 XT. It is quite possible that the cards of the new line will become a more profitable option.
However, the miracle did not happen, the indicators of the real hash rate of the Radeon RX 6800 / RX 6800 XT video cards in mining did not by much exceed the preliminary calculations of specialists based on the technical parameters of these GPU devices. By and large, the new version of Navi is an alternative to the RX 5700 or RTX 3070. But let’s talk about everything in order and start with the appearance, new, already on sale AMD video cards.
Packaging and appearance of AMD Radeon RX 6800
There have been no dramatic changes in the packaging design and appearance of the next generation AMD GPUs. AMD Radeon RX 6800 graphics card is a three-cooler GPU device with a length of almost 30 cm, occupying 2 slots (and 6800 XT, in general, 2.5). I must say that parallel to the increase in power, the sizes of video cards are also growing.
Compared to the diminutive graphics cards of the early 2000s, today’s gaming GPUs look like mastodons that won’t fit into a standard case soon. However, for miners this is absolutely unimportant, the main thing is that the cooling system is as efficient as possible and always cope with the loads. But let’s see what this miracle of technology can do.
AMD Radeon RX 6800 specifications
Comparison table for RX 6800 with its predecessors and competitors.
|RX 6800 XT||RX 6800||RX 5700 XT||RTX 3080||GTX 2080|
|Process technology, nm||7||7||7||8||12|
|Video chip||Navi21XT||Navi21XL||Navi 10||GA102||TU104|
|Number of transistors, billion||26,8||26,8||10,3||28,3||13,6|
|Number of shrader units||4608||3840||2560||8704||2944|
|Computing power FP32, TFLOPS||20,74||16,17||9,75||29,77||10,07|
|Core base frequency, MHz||1487||1372||1605||1515||1440|
|Overclocked core frequency, MHz||2250||2105||1905||1710||1710|
|Video memory frequency, MHz||2000||2000||1750||1188||1750|
|Video memory, GB||16||16||8||10||8|
|Video memory type||GDDR6||GDDR6||GDDR6||GDDR6X||GDDR6|
|Bus bandwidth, bit||256||256||256||320||256|
|Power consumption, watt||300||250||225||320||215|
Testing at the stand, hash rate on different algorithms. On the thematic forums, they asked many questions like: “Is it really possible to get 150 Mh / s on Ethash on the 6000 series from AMD?” Judging by the “naked” teraflops, the computing power of the green flagship is much higher, while the RTX 3080 produces a maximum of 103 Mh / s. And so it happened.
Theoretically, the RX 6800 could not overclock to 100 megahash, even considering the higher core and memory frequencies. If in mining everything depended on the ability of the graphics adapter to work stably at high frequencies, then the more stable overclocking cards with Samsung memory would be worth their weight in gold for the miners.
Yes, hashrate depends on memory and kernel overclocking parameters, but not to such an extent. Of course, you need to take into account that the new architecture significantly improves performance, and after all, mining, after all, is a banal search of cryptographic codes in search of a suitable option. But you can’t argue with the facts, when the new cards were put on the mining of cryptocurrency, they showed what they really could show and nothing more.
The forecast based on technical characteristics disappointed those who really hoped for 150 Mh / s, and bench tests confirmed it.
Real hashrate table for RX 6800 and RX 6800 XT
|RX 5700 XT||RX 6800||RX 6800 XT|
The data was taken from the thematic forum Miningclubinfo, as well as from the mining profitability calculators Minersat and WhatToMine. It turns out that on Ether they hardly surpassed their predecessors. However, it should be borne in mind that 5700 XT cards have already learned how to reflash, but no one has tried to modify the BIOS RX 6800 yet. Perhaps, over time, craftsmen will get to them.
Theoretically, with the correct selection of timings, these video cards can be overclocked on Ethash up to 70, or even up to 75 megahash, but no more. That is, from their competitors RTX 3080, the red video adapters of this series are still lagging behind. Nothing more serious than Radeon VII, the company under the leadership of Dr. Lisa Su never released
Overclocking AMD Radeon RX 6800
What can be said about the overclocking of new video cards. You need to set almost the same parameters as on the old 570/580, memory for 2100/2150 and core 1200/1250.
These graphics adapters work stably on crypto mining in Windows, but there are still problems with HiveOS, according to miners’ reviews. Devices are detected and started, but failures frequently occur. So, if you buy this model, forget about Hive and bet ten. But with the Nicehash miner, AMD cards of the 60th line are quite compatible.
How to reduce the power consumption of video cards?
The easiest way to reduce card consumption is to lower the Powerlimit. And you can also carry out undervolting, that is, lower the voltage of the graphics core by modifying the BIOS or setting the necessary parameters using specialized software.
The first tests showed that a high Power limit gives nothing but an increase in power consumption. The power limit does not need to be raised much, the maximum +20 is not higher. Reducing the voltage using the –cdvc –mcdvc options does not work in the latest version of Phoneixminer. We need to wait for the developers to release a new release. Now the card consumes about 250 watts on Ether.
Profitability, purchase relevance
At the time of this review, the most profitable algorithm is Ethash. More precisely, the Ethereum coin (ETH), since all other tokens of this algorithm, including Ether classic, are in the second ten of the ranking of profitable crypto coins.
At a speed of 64 megahash, the RX 6800 XT video card will earn 0.0023 ETH per day, which is 420 Russian rubles as of April 24, 2021. From this amount, you still need to deduct electricity costs, according to your local tariff. Let’s say the net income is 370 rubles per day or 11100 per month. At a price of 115,000 rubles, the card will pay off in 11/12 months. The term is quite acceptable, however, it can radically change both in one and the other direction.
What conclusion can be drawn. While the market is in an upward trend, the RX 6800, despite the rather high cost, is very profitable. In purely technical terms, progress is evident, but nothing surprising, AMD could not offer it. Analogs from competitors and cards of previous series for miners are no worse. However, the potential of the new Navi GPU devices has not yet been fully revealed.