Tear it down and rebuild it physically. Everything; motherboard out of case, CPU out of socket, remove NVME. Shouldn't take long and may expose possible shorts or poor connections. When rebuilding, rebuild with the minimum needed to get into the BIOS, turn off XMP, make sure it is stable and...
I don't know. My comments are solely for a converted IBM M5015 that has been flashed to an LSI 9260 to bypass the very slow boot process (it was like 2 minutes+ if I recall). It is functionally the same card, but the issue is that IBM branded has a different hardware chip than stock/vanilla LSI...
Unknown. I've never tried to cache my arrays, it's pretty speedy for my media server as it is. The information that I've provided is a simple heads up. I just didn't want you to dive in thinking that it will plug and play. I would suggest that you do a bit of research as things may have changed...
https://lenovopress.com/tips0738-serveraid-m5015-and-m5014
What you are most likely finding for sale (I got mine for $8usd new):
46M0930
5106
ServeRAID M5000 Series Advanced Feature Key
What you need for cachecade:
81Y4426
A10C
ServeRAID M5000 Series Performance Accelerator Key
I have an IBM M5015 that I flashed back to an LSI 9260 for a couple years now. I think you may have an issue beyond what SSD you'd want to use and that would be that the IBM M5014/5 require the IBM specific key in order to unlock the cachecade. You can find the IBM 'advanced key' everywhere for...
I got Crucial Ballistix 3600 MHz DDR4 DRAM Desktop Gaming Memory Kit 32GB (16GBx2) CL16 BL2K16G36C16U4B (BLACK) for $172 delivered. Extremely pleased with them. I have them running at 3800 with no voltage change.
https://smile.amazon.com/dp/B083TRXZ98?psc=1&ref=ppx_yo2_dt_b_product_details
It's not a gimmick, it's a convenience. Also, it has been proven well enough that water cooling is better when factoring in the size of the cooling apparatus. Sure, an air cooler can be effective, but it takes up a lot of space and given that PCs are for the most part standardized this becomes...
This is my experience as well. A rare twitch intro ad, nothing otherwise in twitch and YT is without ads all together.
Edit:
Figured I'd show their stats since I installed it about a year ago. This is only one machine's stats: