Problem swaping motherboard for RTX 3060 LHR v1

[reisdaddy]

Hello,

Before a single MSI RTX 3060 LHR v1 run smooth mining ETH at 49MHs (470.05 nvidia driver + hdmi dummy plug windows 10, t-rex miner) with:

Motherboard: MSI Z390 A PRO
CPU: Intel G5400 Pentium Gold 3.7Ghz Socket 1151

Since it has 6 slot PCIE, i want to use it for another rig.
So i found a cheap mobo:

Motherboard: GA-H61M-S1 rev 3
https://www.gigabyte.com/us/Motherboard/GA-H61M-S1-rev-30/sp#sp
CPU: Intel Core i3-3240
https://ark.intel.com/content/www/us/en/ark/products/65690/intel-core-i33240-processor-3m-cache-3-40-ghz.html

But after it arrived, i swap the motherboard and cpu, the speed just 26 MHs.
No setting change.
In the GigaByte spec page said it has PCIE Gen 3.

Expansion Slots
1 x PCI Express x16 slot, running at x16
(The PCI Express x16 slot conforms to PCI Express 3.0 standard.)
* The PCI Express x16 slots support up to PCI Express 2.0 standard when an Intel 32nm (Sandy Bridge) CPU is installed.

Is it a stupid buy?

Any help would be appreciate.
Thank you in advance

[HardCore12V]

Gigabyte h61M motherboard is old so the pcie bandwidth might be low, here is what I think you can do, update the motherboard bios to the latest version this can bring some changes in pcie speed, though newer motherboards are always better

[FP91G]

After updating the BIOS, I would try mining with another Core i5 processors. If the hash rate did not increase, then you need to think about changing the motherboard.
But before that, try other miners, maybe this will help.
To bypass the LHR blocking, of course, it is better to use more modern motherboards.

[reisdaddy]

Bios already the latest the code is F4.

After doing more research and revisit the Intel spec page, i3-3240 limited to PCIE 2.0!

So i bought used i5-3570.
Its on the way, i will update when its arrive.

[JayDDee]

PCIe 3.0 is not the issue, it's likely software.

[FP91G]

PCIe 3.0 is not the issue, it's likely software.

What software is the problem?
Windows or miner program or drivers?
I have seen on the forums that installing the core i5 processors helped to solve the problem, but this is not a 100% solution to all problems.
It is better to use modern motherboards for new video cards, and any working motherboards are suitable for old video cards.

[kekeck33]

I have very old MB G41M-combo and CPU Q9400 with 3060ti LHR and no problem.

[reisdaddy]

Hello , thx all for the help.

Its work now.

As in the Intel i5-3570 spec page, the pcie 3.0

Back to 49MHs !

[philipma1957]

Hello , thx all for the help.

Its work now.

As in the Intel i5-3570 spec page, the pcie 3.0

Back to 49MHs !

This follow up gets you a merit.

Keep posting and you will make some rank.

[FP91G]

Hello , thx all for the help.

Its work now.

As in the Intel i5-3570 spec page, the pcie 3.0

Back to 49MHs !

Congratulations on your good mining experience.