Bitcoin Forum

Hi together,

i have lots of mining rigs and lots of different motherboards.

On my last rigs i bought each 6 x 6700XTs.

Typical closed mining rig, with cpus i had in stock.

1. Rig with G4400 and 8 GB RAM and 6 x 6700XTs with an older mining mainboard

2. Rig with 6100T and 8 GB RAM and 6 x 6700XTs with the B250c mining mainboard.

Settings were all the same, 1300 on the core and 1075 on the RAM.

1. Rig all GPUs hashed around 46.6 to 46.8 MH/s.
2. Rig all GPUs hashed around >47 to 47.15 MH/s.

The difference for each GPU was 0.2 to 0.4 MH/s.

So i started changing the RAM and GPUs --> same MH/s.
When i changed to 1, Rig mainboard to the B250c the MH/s went up to 47.1 MH/s.

Now i am running both rigs with the B250c and 1 6100T / 6500T.
Difficult to say, but i would say the 2 core 4 threads 6100T runs the GPUs a tiny bit faster.
Same on the 6500T (4 Cores)

Can anybody confirm this? I always thought all Boards and even the slowest CPUs would give the same MH/s.
On my test this is definitly not true.

Why do you care about that tiny performance difference? 🤣 A 0.2MH to 0.4MH won't even do a thing in mining, anyways there is nothing you can do about this, some mobo will just perform better than others in bandwidth performance and others

For me i have no difference in mining speed. I have several cpus, mostly G3900 Celeron, some on Ryzen5 or 9 and all rigs gave me the same speed. And as you written -> changing the motherboard give you more hashrate.
You are using windows or linux?


Who cares? Around 1% is a huge impact.

I use simplemining, so linux.

Huge impact or not, i am always willing to learn something new.

We are all looking for highest hashrate, dont we?

Linux uses the resources much better than Windows and we know that Linux is well known to run extremely well even in old motherboards,that is why the difference in hash rate you got from upgrading the processor is minimal.If you were in Windows you would see that with an old motherboard you would have a lot of difficulty to make a Rx 6700 XT running at 47 Mhsh being stable as hash rate,most probably it would fluctuate a bit.

G4400 is not an old processor is 6 gen and can run Rx 6700 without problems,so that would also run well even in Windows,I have all my rigs based on that processor and my Rx 6800 XT do 64 Mhsh easily which is the limit these cards can do.

The only time the CPU would have any effect if if it's bogged down with other stuff and can't service the GPUs
promptly. This would increase latency but not likely affect the hash rate unless there's an increase in stale shares.
A very large rig (many GPUs) with a very small CPU (few threads) could run into this issue just because of the number
of GPUs it needs to manage.

But overall I suspect the difference in observed hash rate was due to other factors that have nothing to do with the CPU or
motherboard.

If running a desktop OS it's best to shut down any uncecessary processes, services, etc. Indexing service on Windows is a notorious hog.

RAM type or quantity doesn't make much difference as long as there is enough VM to survive the startup of all the GPUs.

PCIe bus speed doesn't matter, that's why x1 risers are good enough, just watch for slot limitations due to sharing with other devices when
using low end CPUs.

Network speed also doesn't matter, just latency that can cause stale shares.

If you have more than 6 GPUs in a rig it's better to have high RAM and high CPU thread so as to make things snappier when loading up or to avoid some crashes but in most cases 4GIG ram and quad core CPU is enough for 8 GPUs or even 12

My 5600xt graphics cards use 4GB of RAM and dual core processors.
If you install more memory, then there will be no improvement in the hash rate. But I use a Linux system hive os, the monitoring window shows the data that 2.3 GB of RAM is free.
Why install an 8 GB mining farm if you can save money?

The difference in price is not big and is future proof

Yes, It's my weird rigs.

I have some Mining dedicated rig made from China, the motherboard have 8 slot, B85 chipset and G1840 CPU, 1 x 4G DDR3 SODIMM, all things old,

But fast than my X570S with AMD Ryzen PRO 4350G + 8G DDR4,

Also fast than my Z270 with G3930,

about ~1%.

I compared everything but no idea why.

Win10 / AMD RX 6600

The future is unknown, and the extra $ 30 must be paid now.
Why then not 16 GB at once?
Memory can always be purchased if necessary, and memory is constantly getting cheaper.
If you are interested, motherboards with DDR 5 have already appeared, but tests show a small performance gain.

I don't think so, quad core CPU for mining is useless because you won't be needing that much core power, in fact a dual core processor is more than enough for mining unless you want to do CPU mining which requires higher end CPUs, for GPU mining the vram and processing power of the GPU is all you need

some big rigs 8-12 cards on some mobos uses a lot of the cpu . But it was little celeron and they kind of ran hard on the cpu.

I used to like i5-6400T cpu's as they ran less power on boards I used to use.

I now go for 12 card rigs like this.

https://minerdude.com/product/pre-order-minerdude-x12-xtreme-12-gpu-smart-mining-rig-pre-order-delivery-late-aug-early-sept/

and use 12 pny a4000 cards in them or 12 pny a2000 cards in them

the rigs work fine on 4gb ram and a celeron cpu.

they are dense and i can hopefully get 30 rigs eventually

with 360 cards in total.

In the past I ran many rigs on single core Sempron processors. You guys probably don’t know what a Sempron CPU is. It’s literally a $5 CPU I bought off EBay because I didn’t want to spend $50 on a quality CPU.

Some I got lucky and unlocked the second core however many I was stuck on single core. It ran at the same speed as a i3 intel processor. However the issues were that it took forever to get windows installed and took a good 5-10 to get the system to finally boot and start running. But once it ran, it ran without any issues, until I had to restart again.

Intel Pentium, i3 CPU and even athlon CPUs works perfectly for mining since the CPUs won't be the ones doing the mining you just need them to power up your motherboard, GPU mining sticks with GPUs and they have nothing to do with CPU

Thank you for lots of answers.
I know that even lowest cpus work well.
In my past years (at my beginning) i ran windows. 8GB Ram helped a lot starting the miner
and using Teamviewer to tune. When i switched to Simplemining 8GB might not be a must.
But i stay with it on all rigs. RAM is cheap and it might help in the future. Who knows....

Anybody out there running a few rigs, with the exact same GPUs (6 or more) and has one
rig build with the B250c motherboard and can compare the hashrate.
Would love to see a bit data.

So far, i only buy the intel B250c and 4 thread cpus like 6100T and up.

The hashrate does not depend on the motherboard, special motherboards are needed to unlock LHR video cards, but this does not apply to our topic.
The hashrate of video cards will differ by 1-2%, and the result depends only on you. I never go into the settings for each video card separately, but use the same settings for all video cards in a mining farm.